Individual Functions6- 99Error CheckErrors are detected during communications using CRC-16. Perform calculations using the following method.1. The factory setting for CRC-16 communications is usually 0, but when using the MEMOBUS system, setthe factory setting to 1 (i.e., set all 16 bits to 1).2. Calculate CRC-16 using MSB as slave address LSB, and LSB as the MSB of the final data.3. Also calculate CRC-16 for response messages from the slaves, and compare them to the CRC-16 in theresponse messages.MEMOBUS Message ExampleAn example of MEMOBUS command/response messages is given below.Reading Storage Register ContentsRead the contents of the storage register only for specified quantities whose addresses are consecutive, startingfrom a specified address. The contents of the storage register are separated into higher place 8 bits and lowerplace 8 bits, and comprise the data within response messages in address order.The following table shows message examples when reading status signals, error details, data link status, andfrequency references from the slave 2 Inverter.Command Message Response Message(During Normal Operation)Response Message(During Error)Slave Address 02H Slave Address 02H Slave Address 02HFunction Code 03H Function Code 03H Function Code 83HStartAddressHigherplace 00H Data quantity 08H Error code 03HLowerplace 20H Lead stor-age registerHigherplace 00HCRC-16Higherplace F1HQuantityHigherplace 00H Lowerplace 65H Lowerplace 31HLowerplace 04H Next stor-age registerHigherplace 00HCRC-16Higherplace 45H Lowerplace 00HLowerplace F0H Next stor-age registerHigherplace 00HLowerplace 00HNext stor-age registerHigherplace 01HLowerplace F4HCRC-16Higherplace AFHLowerplace 82H
