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6.1 PID Control Instruction (Inexact Differential)
6.1.2 PIDCONT instruction
6-9
6
PID CONTROL
INSTRUCTION
S_PIDCONT
S_PIDCONT
Device Data name Description
Setting range
Setting
side
Processing when the
setting data are outside the
setting range
With PID
limits
Without PID
limits
+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.
+16
Alarm
ALARM
• Used to determine if
the change rate of
the MV (manipulated
value) and the PV
(process value) is
within or outside the
limit value range.
• Once set, the alarm
data are maintained
until the user resets
it.
• When the MV
variation is outside
the limit range, bit 1
(b1) is set to '1'.
• When the PV
variation is outside
the limit range, bit 0
(b0) is set to '1'.
User
System
–
+17
PID control work area
(reserved by the system)
–––
to
+32
I/O data area for No. 2 loop (device: +28 to +45)
+33
Set value SV
The same as I/O data area for No. 1 loop
+34
Process
value
PV
+35
Automatic
manipulated
value
MV
+36
Process
value after
filtering
PVf
+37
Manual
manipulated
value
MV
MAN
+38
Manual/
automatic
selection
MAN/
AUTO
+39
Alarm
ALARM
+40
PID control work area
(reserved by the system)
–––
to
+55
s
s
15
to
b
b2
b1
b0
If PV variation
is outside the
limit range,
'1' is set.
If MV variation
is outside the
limit range,
'1' is set.
s
s
s s
s
s
s
s
s
s
s
s
s