IDEC MicroSmart Pentra - Manual (Page 33)

PID M ODULE M AIN F UNCTIONS
4-10 FC5A MicroSmart PID Module User’s Manual FC9Y-B1283
Program Control Operation Bits and Status Monitoring
By turning on/off the operation parameter bit, program control progression can be operated. By
monitoring program run status, the current status of program control can be monitored.
For the allocation of operation parameter, program run status, operating status, see pages 5-7 to 5-10.
Program Control Start (Start the program control)
Turn on the program control bit (Bit3) of the operation parameter. Program control starts.
Program Control Stop (Terminate the program control)
Turn off the program control bit (Bit3) of the operation parameter. Program control stops and enters
standby status.
Program Hold (Suspend the program control)
Turn on the program hold bit (Bit4) of the operation parameter. Program control is held (Suspended).
While the program control is held, time progression is suspended, and fixed value control is performed
with the set point (SP) at the time that the program control is held.
While program is held, the Program Control RUN/HOLD LED (R/H0 or R/H1) of the PID module flashes.
To resume the program control, turn off the program hold bit (Bit4).
Advance Next Function (Proceed to the next step)
Turn off to on the advance next step (Bit6) of the operation parameter. The current step is terminated and
the program control is proceeded to the start of the next step. The advance next function is also effective
while the program control is in wait action.
Advance Previous Function (Move back the program control)
Turn off to on the advance previous step (Bit7) of the operation parameter. The progression of the current
step is stopped and the program control is moved back. If the elapsed time in the current step is less than
1 minute, the program control goes back to the start of the previous step. If the elapsed time in the
current step is longer than 1 minute, the program control goes back to the start of the current step.
Even when the advance previous function is executed at Step 0, the program control does not move back
to Step 9 regardless of the program end action.
Current Step Remaining Time
The remaining time of the current step is stored in the
“Current Step Remaining Time” of Block 0. The
remaining time is stored in seconds or minutes according to the “Step time unit” setting.
Current Step Number
The current step number (0 to 9) is store
d in the “Current Step Number” of Block 0.
Program Wait (Perform program wait)
While the program wait is functioning, the program wait bit (Bit5) of the operating status is turned on. If
the condition below is satisfied, the wait function is cancelled, the program control proceeds to the next
step, and the program wait bit (Bit5) is turned off.
Set point (SP) - Wait value
≤ Process variable (PV) ≤ Set point (SP) + Wait value
If the advance next function (Bit6) is turned from off to on or if the program control bit (Bit3) is turned off,
the wait function is canceled.
Program End Output (Program Termination)
When the program control is finished, the program end output bit (Bit6) of the operating status is turned
on. If the program control bit (Bit3) of the operation parameter is turned off, the program end output bit
(Bit6) is turned off. To start program control again, turn off to on the program control bit (Bit3) of the
operation parameter.