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Download E5CN/E5AN/E5EN/E5GN Basic-type Digital - Innovative-IDM
Transcript
SECTION 5 Modbus Communications Procedure Response Frame Slave Function Write Number of address code start address Elements CRC-16 H'10 1 1 Modbus Name 5-12 2 2 2 bytes Description Slave address The value from the command frame is entered as-is. Function code This is the received function code. When the function ended normally, the function code is left as-is. When an error occurred, the hexadecimal value of H’80 is added to the function code to indicate that the response is an error response. Example: Received function code = H’10 Function code in response frame when an error occurred = H’90 Write start address This is the received write start address. Number of elements This is the received number of elements. CRC-16 This check code is calculated with the data from the slave address to the end of the data. For details on the CRC-16 calculation, see CRC-16 Calculation Example in 5.1 Data Format on page 5-3.
