5.5.2 Pidcont Instruction - Mitsubishi QCPU Structured Programming Manual

S_PIDCONT
Device Data name
Manual/
automatic
+15
S
selection
Alarm ALARM
+16
S
+17
S
PID control work area
to
(reserved by the system)
+32
S
I/O data area for No. 2 loop (device:
Set value
+33
S
Process
+34
S
value
Automatic
manipulated
+35
S
value
Process
value after
+36
S
filtering
Manual
manipulated MV
+37
S
value
Manual/
automatic
+38
S
selection
Alarm ALARM
+39
S
+40
S
PID control work area
to
(reserved by the system)
+55
S
5.5 PID Control Instruction (Inexact Differential)
5-166

5.5.2 PIDCONT instruction

Description
• Select whether the
output to the D/A
conversion module is
a manual
manipulated value or
MAN/
an automatic
AUTO
manipulated value.
• In manual operation,
the automatic
manipulated value
remains unchanged.
• 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'.
+28 to +45)
○ ○
S S
SV
PV
MV
PVf
I/O data area for No. 1 loop
MAN
MAN/
AUTO
Setting range
Setting
With PID Without PID
limits limits
0: Automatic manipulated
value
1: Manual manipulated
value
If PV variation
is outside the
limit range,
'1' is set.
System
If MV variation
is outside the
limit range,
'1' is set.
–
–
Processing when the
setting data are outside the
side
setting range
When other than 0 or 1 is
selected, an error occurs and
User the operation for the
corresponding loop is not
performed.
User
–
– –
– –