Product name: XMT-4000 temperature controller (temperature regulator)
Number of products: 165852-729
Product model: XMT-4000
Produced by: Thermocouple Thermocouple, thermal resistance, bimetal thermometer, polytetrafluoroethylene, PTFE gasket--Shanghai Feilong Instrument & Electrical Co., Ltd.
XMT-00 Series Intelligent Expert PID
Industrial control / regulator
XMT-4000 Series Intelligent Expert PID
30-segment programmable industrial control / regulator (1), function brief
XMT-4000 series programmable temperature control / regulator (XMT-4000 will be described later for simplicity). The meter is based on XMT-3000 series. The hardware structure of the two is exactly the same, so the technical specifications of the meter are roughly the same. The XMT-4000 series instruments are compatible with the functions of the XMT-3000 series instruments (but the XMT-4000 series instruments have cancelled the manual operation function), and the user-programmable time control function has been added. The programming curve can reach up to thirty segments, and two more Event output function. The panels of XMT-4000 series and XMT-3000 series are exactly the same, but the operation methods are very different. XMT-4000 series instruments do not have the three functions of transmission output, external reference and direct valve control.
Before using the XMT-4000 series instrument, the user must read the "XMT-3000 Series Intelligent Special PID Industrial Regulator Operation Manual". Read this manual again, then you need to master the wiring of the meter correctly, and then you need to master the meaning of the parameters of the meter and be able to set the parameters of the meter according to your own needs.
XMT-4000 series instruments are used for occasions that need to change the set value automatically for control according to a certain time regularity. It has an advanced design, strong programming and operating capabilities, a structure with high anti-interference and high reliability, which can be widely adapted to the requirements of various users, and further increase the degree of automation of control equipment. The main features of XMT-4000 series instruments are introduced as follows:
1. 30-step degree control, can set the slope of temperature rise (or pressure, flow, humidity, etc.) of any size.
2. The programming and operation are very flexible, with programmable / operable commands such as jump (loop), run, pause and stop. And allows the program to be modified at any time during the program control operation.
3. Two-way event output function. The interlocking action of other equipment can be controlled through the alarm output to further improve the equipment's automation capability.
4. The external control input switch option can perform program running / pause / stop and other operations through the external switch, which can realize functions such as interlocking and synchronous start operation, and is convenient for workers to operate.
5. Expert PID adjustment method, excellent control characteristics without overshoot and undershoot, with curve fitting function, can obtain smooth and smooth curve control effect.
6, with measurement value start function and preparation function, make the program execution more efficient and complete.
7. It has four choices of power failure / power-on event processing mode to solve the impact of accidental power failure on program control.
(Two), model definition
The model definition of XMT-4000 series instruments is exactly the same as that of XMT-3000 series instruments, please refer to the "XMT-3000 Series Intelligent Expert PID Industrial Regulator User Manual". The difference is that XMT-4000 series instruments cannot install transmission output modules in auxiliary function positions, but allow external control input interface modules to be used for external operations such as program running / pausing and stopping.
2. Panel description and operation instructions (1), panel description (take XMT-4000A instrument as an example)
① PV—Measured value display ⑥AL2—Alarm light ② SV—Set value display ⑦SET—Set value ③ OUT—Output indicator ⑧ <(AT) —Shift key ④ RUN—Program running light ⑨∧—Add key ⑤ AL1 —Alarm light ⑩∨—Decrease key ※ When setting the program: ① The upper display window displays the program code, such as C01, t01, etc., and the lower display window displays the program value. If there is no key operation in this state, it can only be held for about 10 seconds, and then it will automatically return to the state of displaying the measured value.
※ Running status: The upper display window displays the 4-digit measurement value, and the lower display window displays the 4-digit set value.
※ Pause status: The upper display window displays the measured value, and the lower display window alternately displays the given value and the symbol of "HoLd".
※ Stop status: The upper display window displays the measurement, and the lower display window alternately displays the given value and the symbol of "StoP".
※ Time display: If the time display operation is performed, the upper display window displays the current block setting time, and the lower display window displays the running time. Even if you do not press the SET key to exit the time display state, it will automatically return to the state of displaying the measured value after about 30 seconds.
※ RUN (program running) indicator: When the program stops running, the light is off; when the program is running normally, the light is on; when the program is running but the timer is stopped, that is, when the program is paused, ready or auto-tuned Flashing.
(Two), operating instructions
1. Setting procedure: Press the <button to release it immediately, and the meter will enter the setting procedure state. The meter first displays the given temperature at the beginning of the current running segment. At this time, the decimal point of the last digit (single digit) of the displayed data starts to flash (like a cursor). Press the ∨ key to decrease the data, press the ， key to increase the data, and press the <key to move the modified data position (cursor). After changing the given temperature to a suitable value, press the SET key once to display the next range value (current time) to be set, and each program is arranged in order according to temperature, time and so on. The meter allows the program to be modified while the program is running. When setting the program, first press the <key and hold it down, then press the SET key to exit the setting program state in advance, and then press the ∨ key to return to the previous value. Note that if the program settings have been locked (see the introduction of the Loc parameter later), the above operations of setting program values cannot be performed.
2. Set the parameters: Press the SET key and hold for 2 seconds, and then release it after the parameters are displayed. Press the SET key again, the meter will display various parameters accordingly, such as the upper limit alarm value HiAL, parameter lock Loc, etc. The parameter values can be modified by using the <, ∨, ∧ and other keys. In the parameter setting state, after pressing the <key and holding it down, press the SET key to exit the setting parameter state, and then press the ∨ key to return to check the previous parameter, but if the parameter has been locked by Loc, this function cannot carried out.
If the parameters are locked by Loc (introduced later), only the field parameters defined by the EP parameters (parameters that can be defined by the user and frequently used in the job site) can be displayed, and other parameters cannot be seen. However, at least you can see the Loc parameter displayed.
3. Display and modify the program segment number (StEP): During program operation, sometimes it is desired to start from a certain section of the program, or jump directly to a certain section of the program. For example, the current program has run to the fourth section, but the user needs to advance Ending this section and running the fifth section can perform the function of modifying the running section number of the program. The XMT-4000 series can start the program from any of the 30 segments by setting the StEP. If the temperature curve that the user needs to run is less than 30 segments, the meter also allows the user to set multiple different curve programs and execute them separately, as long as their total number of segments (including the necessary control segments) does not exceed 30 segments. For example, if a process curve is a 9-segment program, the instrument can set 3 similar curves. In the production process, different curves can be called by changing the StEP.
To modify the StEP value, press the SET key once during operation to release it, and the meter will display the StEP value. You can modify it by pressing ∨, ∧, etc. Usually StEP automatically increases or jumps with the execution of the program. If the value is changed artificially, the segment running time is cleared to 0, and the program is executed from the beginning of the new segment. If you press SET to exit without changing the StEP value, the program operation will not be affected.
4. Display running time: When StEP is displayed, press the SET key once to release it, the display on the meter displays the segment time of the current segment, and the lower display shows the running time of the current segment. In this state, press the SET key to release it. On, it will return to PV and SV display status.
5. Modify the program curve during operation: During operation, if the current given temperature is to be raised (or lowered) in the constant temperature section, the given temperature in the current section and the given temperature in the next section should be raised (or lowered) at the same time. If you want to increase or decrease the holding time, you can increase or decrease the current segment time. If you want to change the slope of the rising / falling temperature during the temperature rise / fall period, you can change the segment time, the current temperature given temperature, and the next temperature given temperature. If the measured value start function is allowed, the meter will try to change the running time to make the set value consistent with the measured value every time the data is modified during the heating or cooling period. The measured value start function is invalid for the constant temperature section.
6. Run / HoLd: In the stop state, press the 约 key and hold it for about 2 seconds until the run symbol is displayed on the lower display of the meter, then the meter starts running the program. In the running state, press the ∨ key and hold it for about 2 seconds, until the display shows the Hold symbol, the meter enters the pause state. The RUN indicator flashes when in the pause, preparation, and auto-tuning states; the run indicator lights up in the run state. Pause means that the instrument still executes control and controls the given value to the given value during the pause. The time stops increasing and the running time and the given value do not change. In the pause state, press the ∨ key and hold it for about 2 seconds until the run symbol is displayed on the lower display of the meter, and then the meter runs again.
7. Stop (StoP): Press the ∧ key and hold it for about 2 seconds until the StoP symbol appears on the lower display of the meter, at which time the meter performs the stop operation. This operation puts the meter into a stop running state, at the same time StEP is modified to 1, and the output is cleared, and the control output is also stopped. When the user needs to re-execute the program, the run operation can be executed. At this time, the program starts to run from the first paragraph again.
8. Self-tuning (AT): When using the instrument for the first time, the control parameter (M50 / P / t parameter value) should be used to determine the control parameters to achieve the ideal control. Note: The parameter values obtained by the system under different setpoints are not exactly the same, so when the auto-tuning function needs to be performed, the program should be run to the most commonly used setpoint before executing the operation function of starting the auto-tuning. When the auto-tuning is started for the first time, press the <key and hold it for about 2 seconds, then release it when the display shows “At” under the meter. (If it has been started once, this operation function cannot be performed. At this time, the application parameter is set to Ctrl to start the auto-tuning, see the parameter description). During auto-tuning, the meter performs position control. After 2-3 ON / OFF actions, the internal microprocessor of the meter analyzes its period, amplitude and waveform to calculate the best control parameters based on the oscillations generated by the position control. The instrument automatically tunes the control parameters and starts performing precise expert PID control. If you want to abandon the auto-tuning, press the <key in the auto-tuning state and hold it for about 2 seconds, and wait for the "At" on the display under the meter to stop flashing. Normally, you only need to perform the auto-tuning once. After the instrument finishes the auto-tuning, it will set the parameter Ctrl to 3 (the factory is 1), so it is not possible to start the auto-tuning by pressing the <key from the panel again, which can avoid the artificial error to start the auto-tuning again.
The self-tuning is implemented with bit control, and its output is positioned at the position defined by the oPL and oPH parameters. In some cases where the output does not allow a large change, such as some valve control. You can first adjust the oPL and oPH to reduce the output range, limit the output to the allowable range, and then modify the oPL and oPH back to their original positions after the auto-tuning is completed.
Third, the concept explained
The operation of the XMT-4000 instrument is more complicated. The following first explains some terms.
The program segment number can be from 1-30, and the current segment (StEP) indicates the segment currently being executed.
Segment time refers to the total time of program segment running, the unit is minute, valid value is from 1-9999.
The running time refers to the running time of the current segment. When the running time reaches the set segment time, the program automatically moves to the next segment.
The jump program segment can be programmed to automatically jump to any of the 1-30 segments for execution, which can realize cyclic control. Jumping can also be achieved by modifying the value of StEP. In addition, if the block number has reached the 30th block, it will automatically jump back to the 1st block.
When the run / pause program is in the running state, the time is counted, and the given value changes according to the pre-made curve. When the program is paused, the time stops counting and the given value remains unchanged. The meter can program a pause operation in the block. When the program encounters a segment setting time of 0, or when the jump segment jumps to the jump segment (described later), the program enters the pause state. The pause / run operation can also be performed by a person at any time.
Stopping the stop operation will cause the program to stop running. At this time, the running time is cleared to 0 and the timer is stopped. The event output switch is reset and the control output is stopped. When the running operation is performed in the stop state, the meter will start the running program from the segment number set by StEP. The automatic stop function can be programmed in the block setting, and the StEP value of the running block number can be set at the same time. The stop operation can also be performed manually at any time (StEP is set to 1 after execution, but the user can modify it again).
The power failure / power-on event refers to the instrument being powered on or an accidental power failure during operation. The following four types of processing solutions will be introduced for users to choose from.
Event output Event output occurs by programming. It can control the operation of 2 alarm switches during program operation to facilitate the control of synchronous or interlocking work of various external devices.
The measured value start value is often caused by the measured value to be inconsistent with the given value when the running value program is started, after an unexpected power failure / power-on, but the program needs to continue to run, and the StEP value or the program value is manually modified. The running time keeps the two consistent.
When the running program is started, after an unexpected power failure / power-on, but the program needs to be run, and the StEP value or program value is manually modified, if the measured value is different from the given value (if the measured value start function is allowed, the system first uses the measured value start function to perform Processing, only use the preparation function to handle the conditions that do not meet the measurement value start function processing conditions), and the difference is greater than the positive (or negative) deviation alarm value (dHAL and dLAL), the meter does not immediately perform positive (or negative) ) Deviation alarm, but first adjust the measured value to a value smaller than the deviation alarm value. At this time, the program also pauses timing, and the program is not started until the positive and negative deviations meet the requirements. The prepare function is also useful for scenarios where the rise / fall time cannot be predicted. To turn off the preparation function, set dHAL and dLAL sufficiently large.
Curve fitting Curve fitting is a control technology adopted by XMT-4000 meters. Because the control object usually has the characteristics of time lag, the meter automatically smoothes the linear rise, temperature drop and constant temperature curves at the turning points. The lag time parameter t of the system is related. The larger the t, the greater the smoothness, and the smaller the converse. Generally, the smaller the lag time (such as thermal inertia) of the control object, the better the program control effect. Processing the program curve according to curve fitting can avoid overshoot. Note: The characteristics of curve fitting make the program control produce a fixed negative deviation when the linear program is warmed up, and produce a fixed positive deviation when the linear temperature is reduced. The magnitude of this deviation is proportional to the lag time (t) and the temperature rise (fall) . This is normal.
External input event The on / off of a mechanical switch connected outside the instrument can trigger an external input event. It can perform meter operation, pause and stop operations. When you need to execute a program automatically or control multiple instruments to start running at the same time, you can use external input events to achieve it.
Fourth, program layout and operation
The programming of XMT-4000 series meters adopts the temperature-time-temperature format uniformly. The definition is that the temperature is set from the current section and the next temperature is reached after the time set in this section. The temperature setting value is in ° C, and the time value is in minutes. The following example is a 6-segment program example including linear heating, constant temperature, linear cooling, jump loop, preparation, pause, and event output.
The first stage is C 01 = 100 t 01 = 30; linear heating starts from 100 ℃, the heating time is 30 minutes, and the heating slope is 10 ℃ / min.
The second stage is C 02 = 400 t 02 = 60; the temperature is raised to 400 ℃, and the constant temperature time is 60 minutes.
The third stage is C 03 = 400 t 03 = 120; in the cooling section, the cooling section time is 120 minutes, and the cooling slope is 2 ° C / minute.
The fourth paragraph C 04 = 160 t 04 = -35; after cooling down to 160 ℃, turn on the alarm switch 1 and skip to the fifth paragraph for execution.
The 5th paragraph C 05 = 160 t 05 = 0; enter the pause state, and the operator needs to perform the operation before continuing to the 6th paragraph.
The sixth paragraph C 06 = 160 t 06 = -151; turn off alarm switch 1 and skip to the first paragraph for execution and loop from the beginning.
In this example, after jumping from paragraph 6 to paragraph 1, the temperature is 160 ° C and C01 is 100 ° C, which is not the same. The sixth paragraph is the jump section. Assuming the positive deviation alarm value is set to 5 ° C, the program will enter the preparation state after jumping from the fourth paragraph to the first paragraph, that is, first control the temperature to less than the positive deviation alarm value. That is 105 ° C. Then proceed to the first step of the program temperature. This temperature control program is shown below:
Also note that if there is an alarm and it is defined to output through alarm switch 1, the sixth paragraph cannot turn off alarm switch 1, because the alarm can also be turned on.
The advantage of using the temperature-time programming method is that the range of the slope setting for heating and cooling is very wide. The heating and constant temperature sections have a uniform setting format for easy learning. The setting curve is more flexible, or the heating section can be set continuously (such as using a heating section with a different slope to approximate the function heating), or a continuous constant temperature section.
(1) Time setting
tXX = 1-9999 (minutes) represents the time value set in paragraph XX.
tXX = 0 The meter enters the suspended state (Hold) in the XXth section, and the program is suspended here.
tXX = -1—240 A negative time value indicates a control command. To control the stop, jump and two-way event output of program running.
The meaning is as follows: tXX =-(A * 30 + B)
The value of B is 1-30, which means that the program jumps to the segment indicated by the B value.
A = 0, no effect (only execute jump function).
A = 1, turn on alarm switch 1.
A = 2, turn on alarm switch 2.
A = 3, turn on alarm switches 1 and 2 at the same time. 3
A = 4, the instrument performs a stop (StoP) operation. The B value has different meanings. Currently, it should be set to 1, 2-30 has backup meaning.
A = 5, turn off alarm switch 1.
A = 6, turn off alarm switch 2.
A = 7, turn off alarm switches 1 and 2.
For example: The fourth segment of the above example program is defined as, skip to the fifth segment and turn on the alarm switch 1.
Then set: t 04 =-(1 * 30 + 5) =-35
Another example: The sixth paragraph of the above example program is defined as: Jump to the first paragraph and turn off the alarm switch 1.
Then set: t 06 =-(5 * 30 + 1) = -151
Another example: Assume that the program needs to stop and end at the eighth stage.
Then set: t 08 =-(4 * 30 + 1) = -121. This is the setting to stop the program.
After the program ends automatically in the 8th paragraph, after the user performs the run operation, the program will run from the 1st paragraph.
Note: Except when the jump segment is encountered during the execution of the operation or when the power is turned on, the jump operation can continue. When the program jumps to the control section when the program jumps to the control section, the program automatically suspends execution (that is, the meter automatically inserts the pause operation in two consecutive jumps), and the external run / Hold key operation is required to release the suspension. status. Note that if the jump segment jumps to itself (for example, t 06 = -6), it will not be possible to release the paused state, because such a segment can be said to be meaningless. So in the program of the above example, the fifth paragraph (pause operation section) can also be omitted, but in order to make the program easier to understand, we recommend adding this paragraph.
(2) Setting of the given value The settable value range of the given value is -1999— + 9999, which means the temperature value (° C) or line definition unit that needs to be controlled.
(3) Program input operation Press the <key, the meter will enter the program input setting state. The temperature value of the first segment is displayed first. After that, press the SET key in sequence to display the time value and temperature value of the first segment and subsequent segments in sequence. For example, the program in the previous example should read:
Button up and down display description
<C 01 100 The first stage temperature is 100 ℃
SET t 01 30 The first time is 30 minutes
SET C 02 400 The second stage temperature is 400 ℃
SET t 02 60 2nd time is 60 minutes
SET C 03 400 The third stage temperature is 400 ℃
The lower display shows the value. You can use <, ∨, ∧ and other keys to modify the data. The remaining operations have been described in detail previously.
(4) Program layout method when running multiple curves
XMT-4000 series instruments have flexible and advanced programming methods. Because the instrument will stop automatically (StoP), it will automatically set StEP to 1. If the StEP value is not modified before starting the operation, the re-operation generally starts from the first paragraph. . For users with multiple temperature control curves, you can use the method of setting the first segment as the jump segment to execute different curves respectively. If the user has three curves with a length of 8 segments, the program can be arranged at 2-9, 10-17, 18-25. To execute different curves after reset, the first segment (jump segment) should be set as follows:
t 01 = -2; means the first curve (2-9)
t 01 = -10; means the second curve (10-17)
t 01 = -18; means the third curve (18-25)
When you need to change the production process, just set "T 01" to -2, -10, or -18 respectively to make the operation start to run different curves. You can also omit this jump segment, but you can set StEP as the starting segment of the running curve before starting each run.
(5) External event input interface
XMT-4000 instrument can be installed with external event input control interface module in the auxiliary function position of the instrument. After installing this option, the instrument is not allowed to install the communication interface function. The XMT-4000 with this option can use an external switch to control program pause / run and stop functions. The purpose of this function is: 1. Multiple instruments run synchronously or stop synchronously; 2. Convenient operation; this interface can be installed with a run / pause and stop button on the control cabinet, so that the operator does not need to touch the instrument, which is conducive to workers' grasp; A device such as a programmable controller can be used to control the instrument linkage. This interface is located at the auxiliary function of the instrument. See the instrument wiring diagram. The wiring diagram of the external switch is as follows. External control interfaces should be fitted with non-self-locking pushbutton switches. Press the switch run / HoLd, the meter performs the run / pause operation. Press StoP, the meter will stop.
Note: 1. In order to prevent malfunction, the operator is required to hold the button for more than 0.3 seconds to ensure reliable operation.
2. The parameter CF must be set correctly, otherwise it will think that the instrument auxiliary function is a communication interface and cannot work.
V. Power failure processing For XMT-4000 instruments, the run parameter defines the event processing mode when the program is running.
The sudden actions that can affect the control and execution of a program are called events. Events often have the possibility of producing unpredictable results. Event processing is to make these unpredictable situations become predictable results.
run = A * 1 + B * 4
Among them, A is used to select 4 types of power failure / power-on event processing modes, and B is used to select 2 types of operation / modification processing modes. Power failure / power on event processing mode.
XMT-4000 instrument's power failure / startup event processing is an important function. The purpose of program temperature control is to improve the automation level of the equipment to achieve the increase of production speed, product consistency and qualification rate, and reduce the occurrence of human adverse factors. However, under a production condition with a power failure accident, improper power failure handling will interrupt the normal execution of the temperature control program, resulting in production failure. XMT-4000 has a power failure processing function. Users can set it according to their own process needs, which can avoid losses caused by power failure as much as possible.
The meter can reliably save the current segment number StEP, 30 program segments, event output status, running / pause / stop status and running time after power failure. They are all stored in advanced EEPROM devices and can be stored for 10 years. And when the power is turned on, resume or deal with it.
XMT-4000 type meter can choose 4 kinds of power failure processing functions. The setting function of A in the run parameter can be expressed as follows:
A = 0, no matter what the situation, after the power is switched to the 29th section for troubleshooting, such as turning on the event output switch to alarm.
A = 1, if there is no deviation alarm after power on, the execution will continue at the original termination and the event output status will remain unchanged. Otherwise, it will proceed to paragraph 29 and clear the event output status at the same time. This method is suitable for applications with high process requirements.
A = 2, after the instrument is powered on, it will continue to execute at the original termination, which is suitable for applications where the event of power failure does not affect production.
A = 3, no matter what happens after power on, the meter will enter the stop state. Suitable for situations requiring power failure handling.
Run / Modify Event Handling When the XMT-4000 instrument performs a run operation, power failure / power on, but needs to continue to run the program (the power failure / power on event processing is performed first), the user modified the value of the running program of the current segment (the current segment is When setting value, current time period or next set value) or StEP value, the instrument collectively refers to running / modifying event. When the run / modify event occurs, the actual measured value of the meter and the given value calculated by the program are often different, and this difference is often not expected by the user and is difficult to predict because it will cause inconsistency in the program control.
For example: a heating section program, set the meter to rise from 25 ° C to 625 ° C after 600 minutes and 1 ° C per minute. Assuming the program starts from the beginning of the section, if the measured value is exactly 25 ° C, the program can The plan went smoothly. However, if the measured value is 100 ° C at this time (this situation often occurs because the system temperature has not been lowered at startup), it will be difficult for the program to execute smoothly as originally planned. XMT-4000 provides the following modes for users to choose to deal with this type of problem.
B = 0, normal mode, the program is executed as originally planned. This mode guarantees a fixed program running time, but cannot guarantee the integrity of the entire curve.
B = 1, measurement value start function, preset the running time according to the measurement. In the above example, the meter will run from the 75th minute position (the given temperature is 100 ° C at this time). This mode can adjust the running time based on the measured value. Compared with B = 0, this mode reduces the running time and does not guarantee the integrity of the entire curve, but it can ensure the consistency of the heating rate. In the constant temperature section, when the measured value is less than the minimum temperature of the curve or higher than the maximum temperature of the curve (such as when the measured value is less than ℃ or greater than 625 ℃ at startup), this function will be canceled, which is the same as when B = 0.
Preparation function: The preparation function of the XMT-4000 instrument is added to the above two operation / modification event processing modes. Using the quasi-function requires the user to set appropriate deviation alarm parameters such as dHAL and dLAL, so that the above operation / modification event occurs. At this time, if the condition of the deviation alarm is met, the meter will first suspend the program running so that the running time of the given value does not change, nor output the deviation alarm signal, but control the measured value to continue running the program until the deviation alarm is removed. If B = 1 of the above run parameter, the system first executes the measurement value start function, and then executes the preparation function. If the measured value start function works effectively, the preparation function does not need to work because the meter has adjusted the system to a state where there is no deviation alarm. When the measured value start function does not work or B = 0, the run preparation will work. This function can ensure the integrity of the entire program curve, but it increases the running time. The increased time is due to preparation time. Both the preparation function and the measurement value start function are used to resolve the uncertainty of the program operation due to the inconsistency between the measured value and the given value caused by the operation / modification event, in order to obtain a high-efficiency, complete, and user-compliant program operation result.
For example: The user requires the meter to continue execution at the original position after power-on, and has a measurement value start function. A = 2 and B = 1 can be set. Then: run = 2 * 1 + 1 * 4 = 6
Differences from XMT-3000 meters
1. System run parameter run: The run parameter defines the event processing mode when the program runs, as described in Section 5.
2. Parameter setting permission select Loc:
For XMT-4000 instrument
Loc = 0, allowing field parameters to be modified. Program value (time and temperature value) and block number StEP value.
Loc = 1, it is allowed to modify the field parameters and StEP value, but it is not allowed to modify the program.
Loc = 2, allowing modification of field parameters. However, it is not allowed to modify the program StEP value.
Loc = 3, all parameters except the Loc parameter itself can be modified. Neither the program nor the StEP value can be modified.
Loc = 808, all parameters and program StEP values can be set. Note that 808 is the setting password for all XMT-4000 series instruments. When using the instrument, other values should be set to protect the parameters from being modified at will. At the same time, production management should be strengthened to avoid arbitrary operation of the instrument.
If Loc is set to other values, the result may be one of the above results, and in most cases the same as LOC = 1.
3. Output definition parameter oP1:
XMT-4000 meter has no manual operation function, nor does it have the function of directly driving the valve. Therefore, the OP1 parameter cannot be set to 3, or Ctrl cannot be set to 4.
4. Function parameter CF:
CF parameters are used to select some system functions:
CF = A * 1 + B * 2 + C * 4 + D * 8
A = 0, it is the reaction mode, and A = 1, it is the mode of positive action.
B = 0, there is no power-on / setpoint modification for the meter alarm, and the alarm function is waived; B = 1