GE RX3i

Chapter 12. Diagnostics
228 PACSystems* RX7i & RX3i TCP/IP Ethernet Communications User Manual GFK-2224Q
Minor Error Codes for Major Error Code 91H (at Remote Modbus/TCP
Server)
The Minor codes for Major Error Code 91H indicate standard Modbus exception codes returned from the
remote Modbus/TCP server/slave device. (These Modbus exception codes are taken from Modbus Application
Protocol V1.1b, December 28, 2006.)
Error Status (Hex)
Error Description
0191H
Illegal function. The function code received in the query is not an allowable action for the
server. (Modbus exception code 01 ILLEGAL FUNCTION)
0291H
Illegal Data Address. The data address received in the query is not an allowable address
for the server. The combination of reference number and transfer length is invalid.
(Modbus exception code 02 ILLEGAL DATA ADDRESS)
0391H
Illegal Data Value. A value in the query field is not an allowable value for the server. This
indicates a fault in the remainder of the request, such as that the implied length is
incorrect. It specifically does NOT mean that a data item submitted for storage in the
server has an incorrect value. (Modbus exception code 03 ILLEGAL DATA VALUE)
0491H
Slave Device Failure. An unrecoverable error occurred while the server was attempting
to perform the requested action. (Modbus exception code 04 SLAVE DEVICE FAILURE)
0591H
Acknowledge. Used for Programmer operations only. Our Modbus/TCP server does not
support Modbus programmer operations. (Modbus exception code 05 ACKNOWLEDGE)
0691H
Slave Device Busy. The server is unable to accept and process handle this Modbus
request. (Modbus exception code 06 SLAVE DEVICE BUSY)
0791H
Negative Acknowledge. An internal server error occurred while attempting to process a
Modbus request. (Modbus exception code 07 NEGATIVE ACKNOWLEDGE)
0891H
Memory Parity Error. (Function codes 20 and 21 only.) The extended file area failed to
pass a consistency check. (Modbus exception code 08 MEMORY PARITY ERROR)
0991H
Reserved. (Modbus exception code 09 RESERVED)
0A91H
Gateway Path Unavailable. Gateway was unable to allocate a PATH to process the
request. Usually means the gateway is misconfigured or overloaded. (Modbus exception
code 10 GATEWAY PATH UNAVAILABLE)
0B91H
Gateway Target No Response. No response was obtained from target device. Usually
means that the device is not present on the network. (Modbus exception code
11 GATEWAY TARGET NO RESPONSE)