6 PID CONTROL INSTRUCTION
6.2 PID Control Instruction (Exact Differential)
245
6
Setting data
Device
Data name
Description
Setting range
Setting
side
Processing when the
setting data are outside
the setting range
With PID limits
Without PID
limits
(s)+0
Initial processing flag
Processing method at the
start of PID operation
0: PID operation for the number of loops
to be used is batch-processed in one
scan.
Other than 0: PID operation for the
number of loops to be used is processed
in several scans.
User
(s)+1
(s)+9
PID control work area
(reserved by the system)
I/O data area for No. 1 loop (device: (s)+10 to (s)+27)
(s)+10
Setting
value
SV
• PID control target value
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 SV is less than 0, the
value is clipped to 0.
• If SV is greater than 2000,
the value is clipped to
2000.
(s)+11
Process
value
PV
• Feedback data from the
control target to the A/D
conversion module
-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 PV is less than -50, the
value is clipped to -50.
• If PV is greater than 2050,
the value is clipped to
2050.
(s)+12
Automatic
manipulated
value
MV
• Manipulated value
obtained by PID operation
• The value is output from
the D/A conversion
module to the control
target.
-50 to 2050
-32768 to 32767
System
(s)+13
Process
value after
filtering
PVf
• Process value obtained by
calculation using
operational expression.
-50 to 2050
-32768 to 32767
System
(s)+14
Manual
manipulated
value
MV
MAN
• Store the data output from
the D/A conversion
module in manual
operation.
-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 MV
MAN
is less than -50,
the value is clipped to -50.
• If MV
MAN
is greater than
2050, the value is clipped
to 2050.
(s)+15
Manual/
automatic
selection
MAN/
AUTO
• Select whether the output
to the D/A conversion
module is a manual
manipulated value or an
automatic manipulated
value.
• In manual operation, the
automatic manipulated
value remains
unchanged.
0: Automatic manipulated value
1: Manual manipulated value
User
When other than 0 or 1 is
selected, an error occurs and
the operation for the
corresponding loop is not
performed.
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