Mitsubishi MELSEC-L series Programming Manual page 306

S_PIDPRMW
Device Data item
MV change rate
limit
+8
s
( MVL)
PV change rate
limit
+9
s
( PVL)
(Fixed value)
+10
s
Derivative gain
+11
s
(K )
D
(Fixed value)
+12
s
(Fixed value)
+13
s
6.1 PID Control Instruction (Inexact Differential)
6-14
6.1.4 PIDPRMW instruction
Description
With PID limits
Set the variation limit
between the previous
MV and the present MV.
When the MV variation is
greater than the limit
value, bit 1 (b1) of the
0 to 2000
alarm device is set to '1'.
MV variation is not
limited. (Even if the MV
variation exceeds the
limit value, the actual MV
variation is used as it is
for calculating the MV.)
Set the variation limit
between the previous PV
and the present PV.
When the PV variation is
greater than the limit
value, bit 1 (b1) of the
alarm device is set to '1'.
0 to 2000
PV variation is not
limited. (Even if the PV
variation exceeds the
limit value, the actual PV
variation is used as it is
for performing the PID
operation.)
–
Set a duration (delay in
0 to 32767
action) for derivative
(unit: 0.01)
action.
As the setting value
If setting value >
increases, the duration
30000
becomes smaller and
action becomes closer to
K = Infinite
D
differential
exact .
(
Ideal value K = 8.00
D
–
–
Setting range
Setting
Without PID
limits
-32768 to
32767
-32768 to
32767
0 0
0 to 32767
(unit: 0.01)
If setting value >
30000
K = Infinite
D
) ( )
0 0
0 0
Processing when the
setting data are outside the
side
setting range
In the case of "With PID
limits", the PID operation is
performed after values are
replaced as follows:
• If the MVL value is
User
less than 0,
the value is
0.
clipped to
• If the MVL value is
greater than 2000,
the
2000.
value is clipped to
In the case of "With PID
limits", the PID operation is
performed after values are
replaced as follows:
• If the PVL value is
User
less than 0,
the value is
clipped to 0.
• If the PVL value is
greater than 2000, the
2000.
value is clipped to
User
–
An error occurs and the PID
operation for the
User
corresponding loop is not
performed.
User
–
User
–