Precautions
PID(190) is executed as if the execution condition was a STOP-RUN signal.
PID calculations are executed when the execution condition remains ON for
the next cycle after C+9 to C+38 are initialized. Therefore, when using the
Always ON Flag (ON) as an execution condition for PID(190), provide a separate
process where C+9 to C+38 are initialized when operation is started.
If the C data is out of range, an error will occur and the Error Flag will turn ON.
If the actual sampling period is more than twice the designated sampling
period, an error will occur and the Error Flag will turn ON. PID control will still
be executed, however.
The Carry Flag turns ON while PID control is being executed.
The Greater Than Flag turns ON if the manipulated variable after the PID
action exceeds the upper limit. At this time, the results are output at the upper
limit.
The Less Than Flag turns ON if the manipulated variable after the PID action
is below the lower limit. At this time, the results are output at the lower limit.
Within the PID parameters (C to C+38), the only value that can be changed
while the input condition is ON is the set value for C. If any other value is
changed, be sure to turn the input condition from OFF to ON to enable the
new value.