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6.1 PID Control Instruction (Inexact Differential)
6.1.1 PIDINIT instruction
S_PIDINIT
Device Data item Description
Setting range
Setting
side
Processing when the
setting data are outside the
setting range
With PID limits
Without PID
limits
+8
MV lower limit
(MVLL)
Set the lower limit for the
manipulated value (MV)
calculated in PID
operation in automatic
mode.
If the MV is less than the
set lower limit value
(MVLL), the value is
clipped to the MVLL.
-50 to 2050
-32768 to
32767
User
In the case of "With PID
limits", the PID operation is
performed after values are
replaced as follows:
• If the MVLL or MVHL is
less than -50, the value is
clipped to -50.
• If the MVLL or MVHL is
greater than 2050, the
value is clipped to 2050.
+9
MV upper limit
(MVHL)
Set the upper limit for the
manipulated value
calculated in PID
operation in automatic
mode.
If the MV is greater than
the set upper limit value
(MVHL), the value is
clipped to the MVHL.
-50 to 2050
-32768 to
32767
User
+10
MV change rate
limit
( MVL)
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
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.)
0 to 2000
-32768 to
32767
User
In the case of "With PID
limits", the PID operation is
performed after values are
replaced as follows:
• If the MVL value is
less than 0, the value is
clipped to 0.
• If the MVL value is
greater than 2000, the
value is clipped to 2000.
+11
PV change rate
limit
( PVL)
Set the variation limit
between the previous PV
and the present PV.
When the PV variation is
greater than the limit
value, bit 0 (b0) of the
alarm device is set to '1'.
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.)
0 to 2000
-32768 to
32767
User
In the case of "With PID
limits", the PID operation is
performed after values are
replaced as follows:
• If the PVL value is
less than 0, the value is
clipped to 0.
• If the PVL value is
greater than 2000, the
value is clipped to 2000.
s
s
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