IDEC MicroSmart Pentra - Manual (Page 34)

PID M ODULE M AIN F UNCTIONS
FC5A MicroSmart PID Module User’s Manual FC9Y-B1283 4-11
Action when Program Control Starts
The program control mode start type can be selected from 3 types: PV start, PVR start, and SP start.
When SP start is selected, the program control starts from the set point (SP) configured with
“Set point
(SP) when program control starts. ” When PV start or PVR start is selected, and the program control starts,
the step time is advanced until the set point (SP) matches to the process variable (PV), and then the
program control starts. For details about the program control mode start type, see page 6-41.
In the following example, the set point (SP) is 100°C, the step time is 60 minutes, and the process
variable (PV) when program control starts is 25°C.
[SP Start] [PV/PVR Start]
Program End Action
Program end action can be selected from 3 types: Terminate program control, Continue program control
(Repeat), and Hold program control. When the all steps from 0 to 9 are executed and completed, the
program control is finished. When
“Terminate program control” is selected, the PID module will enter
standby status after the program control is finished. While in standby status, no control is performed and
the control output is in OFF status. If
“Continue program control (Repeat)” is selected, the program
control is repeated from step 0 as many times as the repeat number configured. When “Hold program
con trol” is selected, the program control is held (suspended) after the program control is finished, and the
fixed value control is performed with the set point (SP) of Step 9. For details about the program end
action, see page 6-43.
Time
Set Point (SP)
100°C
60 minutes
Starts program control
Set point (SP) when program
control starts
Time
Set Point (SP)
100°C
25°C
60 minutes
45 minutes
When program control is started, the
control starts from the PV starting
point (25°C of the process variable).
PV Starting Point