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MELSEC-Q
3 SPECIFICATIONS
(3) Control status selection when switching to program control
When switching standard control to program control or switching manual control
to program control in the operation mode (Xn1: ON), the control status at
switching can be selected.
Set the control status at switching with the intelligent function module switch
setting (Switch 2).
Refer to Section 4.5 for the intelligent function module switch setting.
(a) When the program control RUN/REST (buffer memory
address 57, 89) is set to 1.
Control status
Control details
Set 1 for switch 2 Set other than 1 for switch 2
PID control Continue
Suspends PID control.
The manipulated value (MV)
becomes -50 while
suspending the control (for
25ms).
Alert status
Loop disconnection warning
Approach flag
Continues the processing in
accordance with the set and
measured values.
Clear
Cascade control
Suspends cascade
control.Perform PID control
while suspending the control.
Suspends PID and cascade
controls.Resume the
cascade control from a
maximum of 500 ms after
resuming the PID control.
(b) When the program control RUN/REST (buffer memory
address 57, 89) is set to 0.
The control status become as follows regardless of the setting of the
Intelligent function module switch setting (Switch 2).
Control details Control status
PID control Stop
Alert status
Loop disconnection warning
Approach flag
Clear
Cascade control Stop
POINT
Check the following contents when switching to program control in the operation
mode (Xn1: ON).
1) Set the start mode setting to PV starting 1 (Time fixed) or PV starting 2 (Time
shortened).
2) Make sure that the each parameter settings for program control is not in an error
status to prevent control operation in the setting error status.
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