Excessive Pid Deviation - Omron 3G3MX2 User Manual

Using Intelligent Output Terminals
4-6-8

Excessive PID deviation

232
The PID loop error is defined as the
magnitude (absolute value) of the dif-
ference between the Setpoint (target
value) and the Process Variable
(actual value). When the error magni-
tude exceeds the preset value for

, the [OD] terminal signal turns
ON. Refer to "PID Loop Operation" on
page 109.
Option Terminal
Code Symbol

OD Excessive
PID
deviation
Valid for inputs: 11, 12, AL0 - AL2

Required settings:
Notes:
• The default difference value is set to 3%. To change this value, change parameter
 (deviation level).
• The example circuit for terminal [11] drives a relay coil. Note the use of a diode to
prevent the negative-going turn-off spike generated by the coil from damaging the
inverter's output transistor.
SP, PV
C044
C044
[OD] 1
signal
0
Function State
Name
ON when PID error is more than the set
threshold for the deviation signal
OFF when PID error is less than the set
threshold for the deviation signal
Section 4-6
Process variable
Setpoint
ON ON
t
Description