West Control Solutions 8700+ - Manual (Page 131)

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Modbus Communications 59305, Issue 7 – March 2014
Pre-Set Multiple Registers (Function 10 Hex)
Writes a consecutive word (two-byte) value to the specified address range.
Table 38. Pre-Set Multiple Registers (Modbus Function 10 Hex)
QUERY
Function 1
st
Word
Address
Number of
Words
Number of
Query Bytes
First value to write
10 HI LO HI LO HI LO
RESPONSE
Function 1st Word Address Number of Words
10 HI LO HI LO
Note:
The number of consecutive words that can be written is limited to 1.
Exception Responses
When a QUERY is sent that the instrument cannot interpret then an Exception RESPONSE
is returned. Possible exception responses are:
Table 39. Modbus Exception Responses
Exception
Code
Error Condition Interpretation
00 Unused
None.
01 Illegal function Function number out of range.
02 Illegal Data Address Write functions: Parameter number out of range or not
supported. (for write functions only).
Read Functions: Start parameter does not exist or end
parameter greater than 65536.
03 Illegal Data Value Attempt to write invalid data / required action not
executed.
The format of an exception response is:
RESPONSE
Function Exception Code
Original Function code with its Most
Significant Bit (MSB) set.
as detailed above
Note:
In the case of multiple exception codes for a single QUERY the Exception code returned is
the one corresponding to the first parameter in error.