Mitsubishi QCPU, Руководство по структурному программированию

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5.5 PID Control Instruction (Inexact Differential)
5.5.2 PIDCONT instruction
5-165
5
QCP
U
IN
S
T
RUCTI
O
N
DE
TA
IL
S
S_PIDCONT
S_PIDCONT
(1) I/O data
*1 : 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)
Device Data name Description
Setting range
Setting
side
Processing when the
setting data are outside
the setting range
With PID
limits
Without PID
limits
+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.
1 : PID operation for the
number of loops to be
used is processed in
several scans.
User
–
+1
PID control work area
(reserved by the system)
– – – –
+9
I/O data area for No. 1 loop (device: +10 to +27)
+10
Set 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.
+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.
+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
–
+13
Process
value after
filtering
PVf
• Process value
obtained by
calculation using
operational
expression.
*1
-50 to 2050
-32768 to
32767
System
–
+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
S
to
S
○
S
○
S
S
S
S
S
S