MANUEL STA46 Modbus TCP
JP Viskovic 30/08/2005 OEE-F 14
1-5 Error response
If the request contains error like address or quantity out of range, the PLC program will generate an
exception response containing the exception code
[Response]
Length Data
Function Code 1 Byte Function Code + 0x80
Exception Code 1 Byte 01, 02 or 03
Exception Code Name
01 ILLEGAL FUNCTION
02 ILLEGAL DATA ADDRESS
03 ILLEGAL DATA VALUE
1-6 Status counter
Counter Channel Descriptions
Exception_Counter W491 Keep a record of illegal request
RCV_Counter W492 Keep a record of response sent
SND_Counter W493 Keep a record of frame received
ER_RCV_Counter W494 Keep a record of socket receive error
ER_SND_Counter W495 Keep a record of socket send error
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