AS Series Module Manual
7- 26
Operand Data type Function Setting range Description
does not support this instruction.
16#1401：group number or module
number setting error
16#1402：the module you are using
does not respond and communication
time out
16#1403：channel setting error
Note:
1. If the PID parameter exceeds the upper limit, only the maximum value can be written in the module, if the
PID parameter is below the lower limit, only the minimum value can be written in the module.
2. When PID_RUN switches from True to False, it clears the MV output value to 0. If you need to keep the
last MV output value, you can switch the operand EN to False to close this instruction and the MV output
value can be kept.
Example
1. You need to set up the parameters before executing DMPID. Switch the operand EN from False to True to
execute this instruction. If you need to change parameters during execution, you can use the UPDATE
flag to update the parameters (including PID_RUN ~ CYCLE). After the parameters are updated, the
system clears the flag UPDATE.
2. When M0 is ON, the instruction is executed. When M2 is ON, the DMPID starts to process. When M2 is
OFF, MV value is 0. And the value in MV is stored in D16. When M0 is OFF, the instruction is not
executed. And the values in the instruction is not changed.
3. When the mode is set to 1, the system starts to auto tuning the parameters for the temperature control.
After tuning is done, the system switches to auto control mode (PID_MODE is set to 0) and fill in the
appropriate parameters (Kc_Kp, Ti_Ki, Td_Kd, Tf, ALPHA and BETA) to data devices. You can also use
retentive devices to retain PID parameters.
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