IDEC MicroSmart Pentra - Manual (Page 127)

A PPLICATION E XAMPLES
7-6 FC5A MicroSmart PID Module User’s Manual FC9Y-B1283
7. Saving Parameters
Click OK button to save the configured parameters.
8. Ladder Programming
Create a ladder program to control the PID module.
Ladder Program Example
Notes:
• The temperature at which Auto-tuning (AT) is performed is determined by the set point (SP) and AT bias. In the
above example, auto-tuning (AT) will be performed when the process variable (PV) reaches 180°C.
• The ladder program should be customized depending on actual applications.
While external input I0 is on, the control of the PID
module is enabled. When Q0 (CH0 control upper limit
alarm output) is on or when Q1 (CH1 control upper limit
alarm output) is on, the control of the PID module is
disabled.
When the process variable (PV) of CH0 control exceeds
205°C, D1010.7 (Alarm 1 output) is turned on, which
turns Q0 on.
When the process variable (PV) of CH1 control exceeds
215°C, D1019.7 (Alarm 1 output) is turned on, which
turns Q1 on.
When external input I1 is turned on, D1022.1 [Auto-tuning
(AT)/Auto-reset bit] is turned on. While D1022.1 is on, the
PID module performs auto-tuning (AT) for CH0 control.
When the PID module completes auto-tuning (AT) for
CH0, D1009.1 [Auto-tuning (AT)/Auto-reset monitor bit] is
turned off. When D1009.1 is turned off, Q3 is turned on.