APPENDIX. HOST COMMUNICATION PROTOCOL
IMR02E20-E1
135
A.3.7 Caution for handling communication data
The numeric range of data used in Modbus protocol is 0000H to FFFFH. Only the set value within
the setting range is effective.
FFFFH represents
1.
The Modbus protocol does not recognize data with decimal points during communication.
Example1: When Heater break alarm (HBA) set value is 20.0 A, 20.0 is processed as 200,
200 = 00C8H
Heater break alarm (HBA)
set value
High 00H
Low C8H
Example2: When Set value (SV) is
20.0
C,
20.0 is processed as
200,
200 = 0000H
00C8H
FF38H
Set value (SV)
High
FFH
Low
38H
In this communication, the data that memory area includes handles different address with for
Control area and for setting area.
If data (holding register) exceeding the accessible address range is accessed, an error response
message is returned.
Read data of unused item is a default value.
Any attempt to write to an unused item is not processed as an error. Data cannot be written into an
unused item.
If an error (data range error or address error) is detected in the data writing process, an error is
returned. Writing is aborted at and after the addresses where an error occurred. After having
completed the setting, check to see if the data was properly written.
An attribute of the item for functions which are not in the controller is RO (read only). If read action
to this item is performed, the read data will be “0.” If write action to this item is performed, no error
message is indicated and no data is written.
For details, refer to
8. COMMUNICATION DATA LIST (P. 34)
.
Send the next command message at time intervals of 24 bits after the master receives the response
message.
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