IDEC MicroSmart Pentra - Manual (Page 139)

A PPLICATION E XAMPLES
7-18 FC5A MicroSmart PID Module User’s Manual FC9Y-B1283
4. Control CH0 Parameters
Configure the Control CH0 parameters in the PID Module Configuration dialog box. To open Control
CH0 Parameters in the PID Module Configuration dialog box, click on Control Parameters (CH0)
button or Control (CH0) tab.
PID Module Configuration Dialog Box (Control CH0 Parameters)
Item Setting
(1) Heating/Cooling Control Enable
(2) Set Point (SP) 200.0°C
(3) AT Bias 20.0°C
5. Saving Parameters
Click OK button to save the configured parameters.
6. Ladder Programming
Create a ladder program for heating/cooling control of 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 180.0°C
• When upper/lower limits alarm with standby is selected as the alarm type, the alarm is not activated until the
process variable (PV) enters the alarm output OFF range (194.5°C to 205.5°C). Once the process variable (PV)
enters the alarm output OFF range, the standby is cancelled and the alarm is activated.
• The ladder program should be customized depending on actual applications.
(1)
(2)
(3)
While external input I0 is on, CH0 control is enabled.
When Q0 (CH0 control upper/lower limits alarm output) is
on, CH0 control is disabled.
When external input I1 is turned on, D1022.1 [auto-tuning
(AT) perform bit] is turned on. When the process variable
(PV) reaches 180.0°C, auto-tuning (AT) is performed.
When the process variable (PV) is out of the range
between 194.5°C and 205.5°C, D1010.7 (Alarm 1 output)
is turned on, which turns Q0 on.