If 4 or 5 is set to PID Control Function Selection (J01), PID Control PID Output Variable Range for
Process Control (E120) is disabled.
PID Gain Adjustment
If the PID function does not provide a stable response, adjust each gain as described below depend-
ing on the state.
State Adjustment method
Changes in target value are not reflected quickly on feedback value. Increase PID P Gain J03
Changes are reflected quickly on feedback value, but not stable. Decrease PID P Gain J03
Target and feedback values do not match quickly. Decrease I Gain J04
Feedback value fluctuates unstably. Increase PID I Gain J04
Increasing PID P Gain does not improve response speed. Increase PID D Gain J05
Increasing PID P Gain results in fluctuating and unstable feedback value. Decrease PID D Gain J05
PID Deviation Excessive (OD)
An absolute value warning or a deviation warning can be output in PID control. As a warning output,
allocate “42: OD (Excessive PID deviation)” to Output Terminal [DO1] Function Selection (E20), Output
Terminal [DO2] Function Selection (E21) and Output T
erminal [ROA, ROB] Function Selection (E27).
At PID Control Select Warning Output Selection (J11), set the warning type, and at PID Control Upper
Limit of Warning (AH) (J12) and PID Control Lower Limit of Warning (AL) (J13), set the upper limit val-
ue and lower limit value of the warning, respectively.
J11 Type Description
0
Warning caused by process com-
mand value
“OD” is ON when PV < AL or AH < PV
PID Control
Lower Limit of Warning (AL)
(J13)
PID Control
Upper Limit of Warning (AH)
(J12)
PID feedback
value (PV)
1
Warning from absolute value with
hold
Same as above (with hold)
2
Warning from absolute value with
latch
Same as above (with latch)
3
Warning from absolute value with
hold and latch
Same as above (with hold and latch)
4 Warning caused by PID error value
“OD” is ON when PV < SV-AL, SV+AH < PV
PID Control
Lower Limit
of Warning (AL)
(J13)
PID Control
Upper Limit
of Warning (AH)
(J12)
PID feedback
value (PV)
PID process command (SV)
5 Warning from PID error with hold Same as above (with hold)
6 Warning from PID error with latch Same as above (with latch)
7
Warning from PID error with hold
and latch
Same as above (with hold and latch)
7 Other Functions
7-133
M1 Series Standard Type User's Manual (I669)
7-9 Other Operation Functions
7
7-9-13 PID Function
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