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(1) I/O data
Device
Data name
Initial processing flag
+0
S
+1
S
PID control work area
to
(reserved by the system)
+9
S
I/O data area for No. 1 loop (device:
Set value
+10
S
Process
+11
S
value
Automatic
manipulated
+12
S
value
Process
value after
+13
S
filtering
Manual
manipulated
+14
S
value
*1 :
Description
Processing method at
the start of PID operation
+10 to
+27)
○
○
S
S
• PID control target
SV
value
• Feedback data from
the control target to
PV
the A/D conversion
module
• Manipulated value
obtained by PID
operation
MV
• The value is output
from the D/A
conversion module to
the control target.
• Process value
obtained by
calculation using
PVf
operational
*1
expression.
• Store the data output
from the D/A
MV
MAN
conversion module in
manual operation.
For Process value after filtering (PVf), the value calculated based on the process value of input data are
stored.
For the operational expression, refer to the following manual.
QCPU (Q Mode)/QnACPU Programming Manual (PID Control Instructions)
Setting range
With PID
Without PID
limits
limits
0
: PID operation for the
number of loops to be
used is batch-processed
in one scan.
1
: PID operation for the
number of loops to be
used is processed in
several scans.
–
–
-32768 to
0 to 2000
32767
-32768 to
-50 to 2050
32767
-32768 to
-50 to 2050
System
32767
-32768 to
-50 to 2050
System
32767
-32768 to
-50 to 2050
32767
5.5 PID Control Instruction (Inexact Differential)
5.5.2 PIDCONT instruction
S_PIDCONT
Processing when the
Setting
setting data are outside
side
the setting range
User
–
–
–
In the case of "With PID
limits", the PID operation is
performed after values are
replaced as follows:
User
• If SV is less than 0, the
value is clipped to 0.
• If SV is greater than
2000, the value is
clipped to 2000.
In the case of "With PID
limits", the PID operation is
performed after values are
replaced as follows:
• If PV is less than -50,
User
the value is clipped
to -50.
• If PV is greater than
2050, the value is
clipped to 2050.
–
–
In the case of "With PID
limits", the PID operation is
performed after values are
replaced as follows:
• If MV
is less than
MAN
User
-50, the value is clipped
to -50.
• If MV
is greater
MAN
than 2050, the value is
clipped to 2050.
5
5-165
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