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Device
Data item
Set the lower limit for the
manipulated value (MV)
calculated in PID
operation in automatic
MV lower limit
mode.
+8
S
(MVLL)
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
MV upper limit
mode.
+9
S
(MVHL)
If the MV is greater than
the set upper limit value
(MVHL), the value is
clipped to the MVHL.
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'.
+10
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
+11
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.)
Setting range
Description
With PID limits
-50 to 2050
-50 to 2050
0 to 2000
0 to 2000
5.6 PID Control Instruction (Exact Differential)
Setting
setting data are outside the
Without PID
side
limits
-32768 to
User
In the case of "With PID
32767
limits", the PID operation is
performed after values are
replaced as follows:
• If MVLL or MVHL value is
less than -50,
clipped to
• If MVLL or MVHL value is
greater than 2050,
-32768 to
User
value is clipped to
32767
In the case of "With PID
limits", the PID operation is
performed after 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
In the case of "With PID
limits", the PID operation is
performed after 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
5.6.1 PIDINIT instruction
PIDINIT
Processing when the
setting range
the value is
-50.
the
2050.
MVL value is
5
the value is
0.
MVL value is
the
2000.
PVL value is
the value is
0.
PVL value is
the
2000.
5-175
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