Chapter 12. DiagnosticsGFK-2224Q January 2017 221Major Error Codes in the COMMREQ Status WordSuccess or a Major Error Code appears in the low byte of the COMMREQ Status Word. Hexadecimal values forthe low byte are listed below. For many Major Error Codes, additional information appears as a Minor ErrorCode in the high byte of the COMMREQ Status Word. Hexadecimal values for the high byte are listed on thefollowing pages.Error Status(Hexadecimal)Major Error Code Description01H Successful Completion. (This is the expected completion value in the COMMREQ Status word.)02H Insufficient Privilege at server PLC. For a PACSystems or Series 90-70 server PLC, the minorerror code contains the privilege level required for the service request.04H Protocol Sequence Error. The server CPU has received a message that is out of order. ContactTechnical Support for assistance.05H Service Request Error at server PLC. The minor error code contains the specific error code.See the following table of Minor Error codes.06H Illegal Mailbox Type at server PLC. Service request mailbox type is either undefined orunexpected. Contact Technical Support for assistance.07H The server PLC CPU’s Service Request Queue is full, usually due to heavy CPU loading. Theclient should retry later. It is recommended that the client wait a minimum of 10 millisecondsbefore sending another service request.0BH Illegal Service Request. The requested service is either not defined or not supported at theserver PLC. (This value is returned in lieu of the actual service request error (01H), to avoidconfusion with the normal successful COMMREQ completion.) Contact Technical Support forassistance.11H SRTP Error Code at server. An error was detected at the SRTP server. See the following tableof Minor Error codes.82H Insufficient Privilege at client PLC. The minor error code contains the privilege level requiredfor the service request.84H Protocol Sequence Error. The CPU has received a message that is out of order. ContactTechnical Support for assistance.85H Service Request Error at the client PLC. The minor error code contains the specific error code.See the following table of Minor Error codes.86H Illegal Mailbox Type. Service request mailbox type is either undefined or unexpected. ContactTechnical Support for assistance.87H The client PLC CPU’s Service Request Queue is full. The client should retry later. It isrecommended that the client wait a minimum of 10 milliseconds before sending anotherservice request.8BH Illegal Service Request. The requested service is either not defined or not supported. (Thisvalue is returned in lieu of the actual service request error (01H), to avoid confusion with thenormal successful COMMREQ completion.). Contact Technical Support for assistance.90H Client (Channels) error. See the following table of Minor Error codes.(Some EGD command errors also use major code 90 when indicating the same errorcondition as channels.)91H Modbus/TCP error code at server. An error was detected at the Modbus/TCP server. See thefollowing table of Minor Error codes.A0H EGD Command error. See the following table of Minor Error codes.
