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6
. Detailed settings for communications
6.2 Modbus (continued)
●
List of function codes (FC)
●
List of error codes
Function code
Name
Description
03(H’03)
Variable area reading
Variable area is read successively.
16(H’10)
Variable area writing
Variable area is written successively.
06(H’06)
Command
Operations are performed according to commands.
08(H’08)
Echo back test
Echo back test is performed.
Error code
Name
Description
Error detection
Priority
H’01
Function code error
Using an unsupported function code.
1
H’02
Variable address error
Invalid value specified for variable address.
2
H’03
Variable data error
Data is invalid.
•
Mismatch with the number of elements
•
Data outside of range
3
H’04
Operation error
The mode is not appropriate.
4
H’05
Status error (error is occurring)
A malfunction has occurred and the unit
continues to be unusable.
5