Mitsubishi Electric MELSEC-Q series Programming Manual page 40

Setting Data Data Item
data No.
Data for 9 MV change
each loop rate limit (
MVL)
10 PV change
rate limit (
PVL)
11 Derivative
gain (K
5 PID CONTROL PROCEDURE
38
5.1 PID Control Data
Description
Sets the limit for variation
between the previous MV
and present MV.
When the MV variation is
greater than the limit
value, 1 is set for bit 1
(b1) of the alarm device.
Does not limit the MV
variation. (If the MV
variation is greater than
the limit value, it is used
unchanged as the MV
variation to calculate the
MV.)
Sets the limit for variation
between the previous PV
and present PV.
When the PV variation is
greater than the limit
value, 1 is set for bit 0
(b0) of the alarm device.
Does not limit the PV
variation. (If the PV
variation is greater than
the limit value, it is used
unchanged as the PV
variation to perform the
PID operation.)
Sets a time period
) (operation delay) for
D
derivative operation.
As the value is greater,
the time period
decreases and operation
becomes closer to
complete derivative.
Incomplete derivative
With PID limits
Setting User
Range Specification
Range
0 to 2000 0 to 2000
0 to 2000 0 to 2000
0.00 to 0 to 32767
300.00 (unit: 0.01)
(Ideal value
is 8.00)
Infinite()
(If the setting
for K
D
exceeds
300.00)
Without PID limits
Setting User
Range Specification
Range
-32768 to -32768 to
32767 32767
-32768 to -32768 to
32767 32767
0.00 to 300.00 0 to 32767
(Ideal value is (unit: 0.01)
8.00)
Infinite()
(If the setting
for K
D
exceeds
300.00)
Processing
when Set Data
is Outside the
Allowable
Setting Range
In the case of
"with PID limits",
PID operation is
performed after
conversion into
the following
value.
• When the MVL
value is less
than -50, it is
converted into -
50.
• When the MVL
value is greater
than 2050, it is
converted into
2050.
In the case of
"with PID limits",
PID operation is
performed after
conversion into
the following
value.
• When the PVL
value is less
than -50, it is
converted into -
50.
• When the PVL
value is greater
than 2050, it is
converted into
2050.
An error occurs
and PID operation
for the
corresponding
loop is not
executed.