IDEC MicroSmart Pentra - Manual (Page 150)

A PPENDIX
FC5A MicroSmart PID Module User’s Manual FC9Y-B1283 9-3
Wait Function
During the program control running, when a step is finished, the program control
does not proceed to the next step until the deviation between the process variable
(PV) and set point (SP) becomes less than the wait value.
Program Hold
During the program control running, when the program control is held, the
progression of the program control is suspended. While the program control is held,
the fixed value control is performed with the set point (SP) at the hold point.
Advance Next Step
During the program control running, when the advance next step bit is turned on,
the current step is terminated, and the program control is proceeded to the next
step.
Advance Previous
Step
During the program control running, when the advance previous step bit is turned
on, the progression of 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
more than or equal to 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.
Repeat Function
When the program control is terminated, the program control can be repeated from
step 0 as many times as the number of repeats configured.
Program End Action
The action to be taken when the program control is terminated can be selected.
Terminate
program
control When the program control is terminated, the program end
output bit is turned on and maintained, and the PID module
will be in standby status.
The program control can be executed again by turning off to
on the program control bit (operation parameter bit3).
During the program control standby (waiting for program
control run) status, the control output is turned off, and the
operating status is not updated except the over range, the
under range, and the program end output.
Continue
program
control
(Repeat) When the program control is terminated, the program
control is repeated from step 0 as many times as the
configured number of repeats. When the step 9 of the last
program control cycle is performed and finished, the
program end output bit is turned on and maintained.
Hold
program
control When the program control is terminated, the program control
is held at the last status of step 9. The program end output
and program hold bit are turned on and maintained. While the
program control is held, the fixed value control is performed
with the set point (SP) of step 9.
If advance next function (operation parameter Bit6 is turned
off to on) is executed while the program control is held, the
program control is started again from step 0. The program
end output and program hold bit are turned off.
While the program control is being held, the parameters of
Blocks 10 to 19 and 30 to 39 can be changed. The program
control can be executed again after changing the program
parameters, such as the set point (SP) or step time of each
step.