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Device
Data name
Manual
manipulated
MV
+14
MAN
S
value
Manual/
MAN/
automatic
+15
S
AUTO
selection
Alarm
ALARM
+16
S
+17
S
PID control work area
to
(reserved by the system)
+27
S
Description
With PID
limits
• Store the data output
from the D/A
-50 to 2050
conversion module in
manual operation.
• Select whether the
output to the D/A
conversion module is
a manual manipulated
0: Automatic manipulated
value or an automatic
manipulated value.
1: Manual manipulated
• 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'.
5.6 PID Control Instruction (Exact Differential)
Setting range
Setting
Without PID
side
limits
-32768 to
User
32767
value
User
value
If PV variation
is outside the
User
limit range,
'1' is set.
System
If MV variation
is outside the
limit range,
'1' is set.
–
–
5.6.2 PIDCONT instruction
PIDCONT
Processing when the
setting data are outside
the setting range
In the case of "With PID
limits", the PID operation is
performed after values are
replaced as follows:
• If MV
is less than
MAN
-50, the value is clipped
to -50.
• If MV
is greater than
MAN
2050, the value is
clipped to 2050.
When other than 0 or 1 is
selected, an error occurs
and the operation for the
corresponding loop is not
performed.
–
–
5-181
5
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