Instruction manual

6. MODBUS COMMUNICATION PROTOCOL
IMR01H02-E3
55
6.8 Communication Data List
The communication data list summarizes names, descriptions, factory set values and attributes.
Attribute (RO: Read only, R/W: Read and Write)
The communication data whose name is marked with ! indicates that corresponding to the
memory area.
In case of Modbus communication, data are treated as binary data in communication.
Name Data range Factory set value Attri-
bute
Measured value (PV) Within input range. ----- RO
Manipulated output
value
1
-5.0 to +105.0 % ----- RO
Cool-side manipulated
output value
(This item does not use in
the MA901.)
Current transformer 1
input value
CTL6P: 0.0 to 30.0 A
CTL12: 0.0 to 100.0 A
----- RO
Current transformer 2
input value
(This item does not use in
the MA901.)
STATUS
2
0 to 135 ----- RO
1
For heat/cool PID control: Heat-side manipulated output value
2
The alarms and burnout statuses are converted to the corresponding decimal data, respectively and
then are sent to the host computer. Convert the decimal data sent from the controller to the
corresponding binary data (bit image) to confirm the status.
Bit number Details Alarm status
b0 Alarm 1 status
b1 Alarm 2 status
b2 Burnout status 0: OFF 1: ON
b3 to b6 Unused
b7 Alarm 3 status
b8 to b15 Unused
Example:
Bit images (Decimal number) (Binary number)
OFF/ON status
135 = 0 000000010000111
Bit number
b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
If any defect (welding, etc.) is found in the relay located inside the instrument, the output
status may differ from the relay contact status.
Continued on the next page.