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PIDPRMW
Device
Data item
Proportional
constant
+2
S
(KP)
Integral
constant
+3
S
(TI)
Derivative
constant
+4
S
(T
)
D
Filter coefficient
+5
S
(
)
MV lower limit
+6
S
(MVLL)
MV upper limit
+7
S
(MVHL)
5.6 PID Control Instruction (Exact Differential)
5-186
5.6.4 PIDPRMW instruction
Description
With PID limits
Proportional gain of PID
1 to 10000
operation
(unit: 0.01)
1 to 32767
Constant that expresses
(unit: 100ms)
the magnitude of the
integral action (I action)
If setting value
effect.
Increasing the integral
> 30000
constant slows down the
T1 = Infinite
manipulated value
change.
(
Constant that expresses
the magnitude of the
derivative action (D
action) effect.
Increasing the derivative
0 to 30000
constant causes
(unit: 10ms)
significant changes in the
manipulated value even
with a slight change of
the control target.
Set the degree of filtering
to be applied to the
process value.
0 to 100
The filtering effect
decreases as the value
gets closer to 0.
Set the lower limit for the
manipulated value (MV)
calculated in PID
operation in automatic
mode.
-50 to 2050
If the MV is less than the
set lower limit value
(MVLL), the value is
clipped to the MVLL.
Set the upper limit for the
manipulated value
calculated in PID
operation in automatic
-50 to 2050
mode.
If the MV is greater than
the set upper limit value
(MVHL), the value is
clipped to the MVHL.
Setting range
Setting
Without PID
side
limits
1 to 10000
User
(unit: 0.01)
1 to 32767
(unit: 100ms)
If setting value
User
> 30000
T1 = Infinite
)
(
)
0 to 30000
User
(unit: 10ms)
0 to 100
User
-32768 to
User
32767
-32768 to
User
32767
Processing when the
setting data are outside the
setting range
An error occurs and the PID
operation for the
corresponding loop is not
performed.
In the case of "With PID
limits", the PID operation is
not 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.
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