SUNSTONE CDDP-A - Modbus Exception Codes

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Byte 16 17 18 19 20 21 22 23
Name Priority IP
1[1]
Priority IP
1[0]
Priority IP
2[3]
Priority IP
2[2]
Priority IP
2[1]
Priority IP
2[0]
Timeout
(minutes)
Whitelist
Usage
Type uint8 uint8 uint8 uint8 uint8 uint8 uint8 bool
Byte 24 25 26 27 28 29 30 31
Name Whitelist
IP 1[3]
Whitelist
IP 1[2]
Whitelist
IP 1[1]
Whitelist IP
1[0]
Whitelist
IP 2[3]
Whitelist
IP 2[2]
Whitelist
IP 2[1]
Whitelist
IP 2[0]
Type uint8 uint8 uint8 uint8 uint8 uint8 uint8 uint8
Byte 32 33 34 35 36 37 38 39
Name Whitelist
IP 3[3]
Whitelist
IP 3[2]
Whitelist
IP 3[1]
Whitelist
IP 3[0]
Whitelist IP
4[3]
Whitelist
IP 4[2]
Whitelist
IP 4[1]
Whitelist
IP 4[0]
Type uint8 uint8 uint8 uint8 uint8 uint8 uint8 uint8
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Code Name Explanation
0x01 ILLEGAL FUNCTION The function code received in the query is not an al-
lowable action for the server. This may be because the
function code is only applicable to newer devices and was
not implemented in the unit selected. It could also indicate
that the server is in the wrong state to process a request
of this type, for example because it is uncongured and is
being asked to return register values.
0x02 ILLEGAL DATA ADDRESS The data address received in the query is not an allowable
address for the server. More specically, the combination
of reference number and transfer length is invalid. For a
controller with 100 registers, the PDU addresses the rst
register as 0, and the last one as 99. If a request is submit-
ted with a starting register address of 96 and a quantity of
registers of 4, then this request will successfully operate
(address-wise at least) on registers 96, 97, 98, 99. If a
request is submitted with a starting register address of 96
and a quantity of registers of 5, then this request will fail
with Exception Code 0x02 “Illegal Data Address” since it
attempts to operate on registers 96, 97, 98, 99 and 100,
and there is no register with address 100.