Requests Made This section consists of a list of all of the requests made by the test. Each item in the list will display a request number, status of the request (see Error Display below), the device ID, function code, data type, number of registers requested and the starting register address. NOTE: The Request number is a generated number and represents the order in which a request was made. Its main purpose though is to associate a request with a response. If there is a succesful response to a given request, the reponse number will be equal to the request number. Request Packet This section contains the packet buffer displayed in hexadecimal form. Packet Data This section contains the key information from the request packet buffer labeled and formatted. In addition, the data type associated with the request is displayed for reference. Error Display This section displays the status icon and error message text of any non-critical error that occurred. Normally the requests section will actually show a response error since there will be no response to display. The lists below indicate the status icons and error messages that may occur. Status Icons When an error occurs a status icon will be displayed on the far left side of the Error Display area (an icon will always be displayed in the list of requests). Below is a list of all of the possible status images: Icon Status (Error) Type Successful Modbus exception code Unknown Modbus exception code Read error Write error Unknown error Error Messages When a non-critical error or a Modbus exception occurs an error number or Modbus exception code followed by an error message will be displayed to the right of the status image. The possible errors and Modbus exceptions are as follows:
Requests Made This section consists of a list of all of the requests made by the test. Each item in the list will display a request number, status of the request (see Error Display below), the device ID, function code, data type, number of registers requested and the starting register address. NOTE: The Request number is a generated number and represents the order in which a request was made. Its main purpose though is to associate a request with a response. If there is a succesful response to a given request, the reponse number will be equal to the request number. Request Packet This section contains the packet buffer displayed in hexadecimal form. Packet Data This section contains the key information from the request packet buffer labeled and formatted. In addition, the data type associated with the request is displayed for reference. Error Display This section displays the status icon and error message text of any non-critical error that occurred. Normally the requests section will actually show a response error since there will be no response to display. The lists below indicate the status icons and error messages that may occur. Status Icons When an error occurs a status icon will be displayed on the far left side of the Error Display area (an icon will always be displayed in the list of requests). Below is a list of all of the possible status images: Icon Status (Error) Type Successful Modbus exception code Unknown Modbus exception code Read error Write error Unknown error Error Messages When a non-critical error or a Modbus exception occurs an error number or Modbus exception code followed by an error message will be displayed to the right of the status image. The possible errors and Modbus exceptions are as follows:
PI_ModbusS_4.0.7.61.docx