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Device
Data item
Set the variation limit
between the previous
MV and the present MV.
When the MV variation is
greater than the limit
MV change rate
value, bit 1 (b1) of the
limit
alarm device is set to '1'.
+8
S
(
MVL)
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
PV change rate
alarm device is set to '1'.
limit
+9
S
PV variation is not
(
PVL)
limited. (Even if the PV
variation exceeds the
limit value, the actual PV
variation is used as it is
for performing the PID
operation.)
Precautions
The following table shows the CPU modules applicable to the PID control instructions (inexact
differential) and the PID control instructions (exact differential).
High Performance model
QCPU
Universal model QCPU
Setting range
Description
With PID limits
0 to 2000
0 to 2000
CPU module model
The first five digits of the serial number are
'05031' or lower.
The first five digits of the serial number are
'05032' or higher.
5.6 PID Control Instruction (Exact Differential)
Setting
setting data are outside the
Without PID
side
limits
In the case of "With PID
limits", the PID operation is
performed after values are
replaced as follows:
-32768 to
User
•
32767
0,
•
than 2000,
clipped to
In the case of "With PID
limits", the PID operation is
performed values are
replaced as follows:
-32768 to
• If the
User
32767
less than 0,
clipped to
• If the
greater than 2000,
value is clipped to
Inexact
differential
differential
: Applicable,
: Not applicable
5.6.4 PIDPRMW instruction
PIDPRMW
Processing when the
setting range
MVL value is less than
0.
the value is clipped to
MVL value is greater
the value is
2000.
PVL value is
the value is
0.
PVL value is
the
2000.
5
Exact
5-187
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