Mitsubishi Electric MELSEC-Q series Programming Manual page 77

• Use the READY signal to establish an interlock with respect to the individual modules, so that the PIDCONT(P) instruction
is executed only when both the A/D converter module for reading the PV (process value) and the D/A converter module for
outputting the MV (manipulated value) are normal. If the PIDCONT(P) instruction is executed while either or both of the
modules are faulty, PID operation cannot be executed correctly because the PV (process value) cannot be read correctly
and/or the MV (manipulated value) cannot be output correctly.
[OPERATION ERRORS]
An operation error will occur, the error flag (SM0) will be turned ON, and an error code will be stored in SD0, in the following
cases.
Error code Description
4103 When the PIDINIT(P) instruction is not executed before executing the PIDCONT(P) instruction.
4100 When the value set as the PID control data is outside the allowable range.
4101 When the device range allocated to the PID control data area, designated with
device.
For details on the READY signals of the A/D converter module and D/A converter module, refer to the manual for the relevant
module.
9 COMPLETE DERIVATIVE PID CONTROL INSTRUCTIONS AND PROGRAM EXAMPLES
, exceeds the last device number of the corresponding
S
9.1 PID Control Instructions
9
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