I/O Data - Mitsubishi Electric MELSEC-Q series Programming Manual

5.2

I/O Data

The I/O data consists of input data, such as the SV (set value) and PV (process value), which are set to execute PID
operation, and output data, such as operation results.
The I/O data area is divided into the "data area where data are allocated loop-by-loop" and "work area used by the system to
perform PID operation".
I/O Data List
■QCPU, LCPU
Data Name Description
Set value SV PID control target value
Process value PV Feedback data from
controlled system objective to
A/D converter module
Automatic MV The manipulated value
manipulated calculated by PID operation.
value Output from the D/A
converter module to the
controlled system.
Process value PV Process value calculated
f
after filtering 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)
Manual MV In the manual control mode,
MAN
manipulated the data output from the D/A
value converter module is stored.
Manual/ MAN/ Selects whether the output
automatic AUTO data to the D/A converter
selection module is shown as a manual
manipulated value or an
automatic manipulated value.
In manual control mode, the
automatic manipulated value
remains unchanged.
Setting Range
With PID limits Without PID limits
0 to 2000 -32768 to 32767
-50 to 2050 -32768 to 32767
-50 to 2050 -32768 to 32767
-50 to 2050 -32768 to 32767
-50 to 2050 -32768 to 32767
0: Manual manipulated value 0: Manual manipulated value
1: Automatic manipulated 1: Automatic manipulated
value value
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 -
MAN
50, MV must be -50.
MAN
• When MV is greater
MAN
than 2050, MV must be
MAN
2050.
An error occurs if the setting
is neither 0 nor 1, and PID
operation of the
corresponding loop will not
be executed.
5 PID CONTROL PROCEDURE
5.2 I/O Data
5
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