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6.1 PID Control Instruction (Inexact Differential)
6.1.4 PIDPRMW instruction
6-13
6
PID CONTROL
INSTRUCTION
S_PIDPRMW
S_PIDPRMW
Device Data item Description
Setting range
Setting
side
Processing when the
setting data are outside the
setting range
With PID limits
Without PID
limits
+2
Proportional
constant
(K
P)
Proportional gain of PID
operation
1 to 10000
(unit: 0.01)
1 to 10000
(unit: 0.01)
User
An error occurs and the PID
operation for the
corresponding loop is not
performed.
+3
Integral
constant
(T
I)
Constant that expresses
the magnitude of the
integral action (I action)
effect.
Increasing the integral
constant slows down the
manipulated value
change.
1 to 32767
(unit: 100ms)
If setting value
> 30000
T
I = Infinite
( )
1 to 32767
(unit: 100ms)
If setting value
> 30000
T
I = Infinite
( )
User
+4
Derivative
constant
(T
D)
Constant that expresses
the magnitude of the
derivative action (D
action) effect.
Increasing the derivative
constant causes
significant changes in the
manipulated value even
with a slight change of
the control target.
0 to 30000
(unit: 10ms)
0 to 30000
(unit: 10ms)
User
+5
Filter coefficient
( )
Set the degree of filtering
to be applied to the
process value.
The filtering effect
decreases as the value
gets closer to 0.
0 to 100 0 to 100 User
+6
MV lower limit
(MVLL)
Set the lower limit for the
manipulated value (MV)
calculated in PID
operation in automatic
mode.
If the MV is less than the
set lower limit value
(MVLL), the value is
clipped to the MVLL.
-50 to 2050
-32768 to
32767
User
In the case of "With PID
limits", the PID operation is
performed after values are
replaced as follows:
• If MVLL or MVHL value is
less than -50,
the value is
clipped to -50.
• If MVLL or MVHL value is
greater than 2050,
the
value is clipped to 2050.
+7
MV upper limit
(MVHL)
Set the upper limit for the
manipulated value
calculated in PID
operation in automatic
mode.
If the MV is greater than
the set upper limit value
(MVHL), the value is
clipped to the MVHL.
-50 to 2050
-32768 to
32767
User
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