Mitsubishi Electric MELSEC-Q series Programming Manual page 54

Data Name
Alarm ALARM
■QnACPU
Data Name
Set value SV
Process value PV
Automatic MV
manipulated
value
Process value P
Vf
after filtering
Manual MV
MAN
manipulated
value
Manual/ MAN/
automatic AUTO
selection
Alarm ALARM
5 PID CONTROL PROCEDURE
52
5.2 I/O Data
Description Setting Range
With PID limits
Used to determine if the
change rate of the MV
(manipulated value) and the
PV (process value) is within
or outside the allowable
range.
Once set, the alarm data is
retained until the user resets
it.
If the MV is outside the limit
range, "1" is set for bit 1 (b1).
If the PV is outside the limit
range, "1" is set for bit 0 (b0).
Description
PID control target value
Feedback data from controlled system
objective to A/D converter module
The manipulated value calculated by PID
operation.
Output from the D/A converter module to the
controlled system.
Process value calculated using the operation
formula in POINT(1) in Section 3.1.2/
POINT(1) in Section 3.2.2. ( Page 15
Operation expressions,  Page 21
Operation expressions)
In the manual control mode, the data output
from the D/A converter module is stored.
Selects whether the output data to the D/A
converter module is shown as a manual
manipulated value or an automatic
manipulated value.
In manual control mode, 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 allowable range.
Once set, the alarm data is retained until the
user resets it.
If the MV is outside the limit range, "1" is set
for bit 1 (b1).
If the PV is outside the limit range, "1" is set
for bit 0 (b0).
Without PID limits
Setting Range
0 to 2000
-50 to 2050
-50 to 2050
-50 to 2050
-50 to 2050
0: Manual manipulated value
1: Automatic manipulated
value
Processing when Set
Data is Outside the
Specified Range

Processing when Set Data is Outside
the Specified Range
For the QCPU or LCPU with "With PID limits"
setting or QnACPU, convert it to the following
value for PID operation.
• When SV is less than 0, SV must be 0.
• When SV is greater than 2000, SV must be
2000.
For the QCPU or LCPU with "With PID limits"
setting or QnACPU, convert it to the following
value for PID operation.
• When PV is less than -50, PV must be -50.
• When PV is greater than 2050, PV must be
2050.

For the QCPU or LCPU with "With PID limits"
setting or QnACPU, convert it to the following
value for PID operation.
• When MV is less than -50, MV
MAN
be -50.
• When MV is greater than 2050, MV
MAN
must be 2050.
An error occurs if the setting is neither 0 nor 1,
and PID operation of the corresponding loop
will not be executed.

must
MAN
MAN