Instruction manual

6. MODBUS COMMUNICATION PROTOCOL
IMR01H02-E3
59
Continued form the previous page.
Name Data range Factory set
value
Attri-
bute
Proportioning cycle
time
1, 2
1 to 100 seconds Relay contact output:
20
Voltage pulse/
triac output: 2
R/W
Cool-side
proportioning cycle
time
2
(This item does not use
in the MA901.)
1 to 100 seconds Relay contact output:
20
Voltage pulse/
triac output: 2
R/W
3
Control loop break
alarm deadband (LBD)
!
0 to span
However, 9999 digits or less
(0: LBD OFF)
Temperature input:
0 or 0.0
Voltage input: 0.0
R/W
4
PV bias -span to +span
(Within -1999 to +9999 digits)
Temperature input:
0 or 0.0
Voltage input: 0
R/W
Digital filter 0 to 100 seconds (0: Digital filter OFF) 0 R/W
Setting change rate
limiter !
0 (0.0) to span/min.
(0 or 0.0: Setting change rate limiter OFF)
0R/W
RUN/STOP transfer
5
0: STOP 1: RUN 1 R/W
Memory area number
selection
1 to 8 1 R/W
Scan interval time 1 to 10 seconds 2 R/W
Device address
6
(Slave address)
0 to 99 0 R/W
Communication speed
6
0: 2400 bps 2: 9600 bps
1: 4800 bps 3: 19200 bps
2R/W
1
For heat/cool control: Heat-side proportioning cycle time
2
In case of current output (0 to 20 mA DC, 4 to 20 mA DC), these data becomes invalid.
3
In case of heat control, become RO (read only).
4
Become RO (read only) when the alarm 1 is other than control loop break alarm (LBA).
5
Relation with RUN/STOP transfer by DI
The instrument cannot be changed to the “RUN” by communication, if the instrument is the STOP
state by the contact input. (The “STOP” has priority.)
DI state RUN/STOP transfer by communication Instrument state
RUN RUN RUN
RUN/STOP
RUN STOP STOP
state
STOP RUN STOP
STOP STOP STOP
6
The value changed becomes effective when the power is turned on again or when changed from
STOP to RUN.
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