GE AF-650 GP Quick Installation Manual
Also see for AF-600 FP Series: Quick guideOperating instructionsDesign and installation guideOperating instructionsOperating instructions
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Contents
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5.2.13 Modbus Exception CodesFor a full explanation of the structure of an exception code response, please refer to the section Modbus RTU Message Framing Structure, Function Field.Modbus Exception CodesCode Name Meaning1 Illegal function The function code received in the query is not an allowable action for the server (or slave). This may bebecause the function code is only applicable to newer devices, and was not implemented in the unit selected.It could also indicate that the server (or slave) is in the wrong state to process a request of this type, forexample because it is not configured and is being asked to return register values.2 Illegal data address The data address received in the query is not an allowable address for the server (or slave). More specifically,the combination of reference number and transfer length is invalid. For a controller with 100 registers, arequest with offset 96 and length 4 would succeed, a request with offset 96 and length 5 will generateexception 02.3 Illegal data value A value contained in the query data field is not an allowable value for server (or slave). This indicates a faultin the structure of the remainder of a complex request, such as that the implied length is incorrect. It spe-cifically does NOT mean that a data item submitted for storage in a register has a value outside the ex-pectation of the application program, since the Modbus protocol is unaware of the significance of anyparticular value of any particular register.4 Slave device failure An unrecoverable error occurred while the server (or slave) was attempting to perform the requested action.5.3 Control ProfileThe frequency converter can be controlled according to the GE Drive protocol. Select the desired control profile in par. O-10 Control Word Profile. The choice ofprofile affects the control and status word only.The GE Drive control profile sections provide a detailed description of control and status data.Modbus TCP275 |
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