C1-9
IM 34M06H62-02E
2nd Edition : June 2008-00
Table C1.7 Parameters Related to Two-input Changeover Control
Data Position Number
Symbol
Description
Unit
Data Range
Default
Value Attribute Stored
See
Also
Loop1 Loop2 Loop3 Loop4
101
301
501
701
PVIN
Input process value
Industrial
unit
-5 to 105% of (SL to SH)
—
RO
—
C3
102
302
502
702
PV
Process value
Industrial
unit
-5 to 105% of (PRL to PRH)
—
RO
—
303
703
CSP
Control set point
Industrial
unit
PRL to PRH
—
RO
—
C4
304
704
HOUT
Control output
%
OL to OH: for single output
0 to OH: for heating/cooling
output
—
RO
—
C2
C7.1
305
705
COUT
Cooling control output
%
0 to OL: for heating/cooling
output
—
RO
—
321
721
RUN/STP Run/stop selection
None
0: Stop; 1: Run
0
RW
—
C7.1
322
722 A/M/C
Automatic/manual/
cascade selection
None
0: Automatic, 1: Manual
0
RW
—
C7.2
C7.4
323
723
INSEL
Input selection
None
0: Input 1, 1: Input 2
0
RW
—
C3.11
324
724 RMT/LOC
Remote/local
selection
None
0: Local
1: Remote
0 RW —
C7.3
125 325 525 725 EXPV/PV
External/normal input
selection
None
0: Normal input
1: External input
0 RW —
C3.12
326
726
EXOUT/
OUT
External/normal
output selection
None
0: Normal output
1: External output
0 RW —
C2.6
328
728
SPNO
SP number selection
None
1 to 4
1
RW
—
C4.1
131 331 531 731 EXPV External
input
Industrial
unit
-5 to 105% of (SL to SH)
SL
RW
—
C3.12
333
733
RSP
Remote set point
Industrial
unit
PRL to PRH
PRL
RW
—
C4.2
334
734 MOUT
Manual
output
%
OL to OH: for single output
0 to OH: for heating/cooling
output
0 RW —
C7.2
C7.4
335
735
MOUTC Manual cooling output
%
0 to OL
0
RW
—
336
736
EXOUT External output
%
-5.0 to 105.0%
0
RW
—
C2.6
361
761
SELMD
Two-input changeover
mode
None
0: Automatic changeover
using temperature range
1: Automatic changeover
using upper limit
2: Manual changeover using
input selection
0
RW
C3.11
362
762
SELH
Two-input changeover
upper limit
Industrial
unit
PRL to PRH if SELL < SELH.
If SELL
SELH, changeover
occurs with respect to SELH.
PRL+
1
RW
363
763
SELL
Two-input changeover
lower limit
PRL
RW
In two-input changeover control mode, loops 1 and 2, or loops 3 and 4 form a pair; the
even-numbered loop (loop 2 or 4) takes control and the input process value switches
between the input process values of the odd-numbered loop and the even-numbered loop.
For the odd-numbered loop, only the PV-related functions are used.
For the even-numbered loop, the PV-related functions switch between the input process
value of the odd-numbered loop and the even-numbered loop. Changeover is performed
manually (using operation control parameters) or automatically (by specifying higher/lower
temperature ranges). When changeover is based on temperature ranges, the
odd-numbered loop covers the lower temperature range while the even-numbered loop
covers the higher temperature range.
For details on individual functional blocks, see Sections C3, "PV-related Functions," C4,
"SP-related Functions," C6, "Control and Computation Function," and C2, "Output-related
Functions."
TIP
The two-input changeover control mode uses two sets of PV processing functions, and is useful
especially for switching between two control targets according to the operating status, or switching
between two types of sensors according to the monitored temperature.
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