Frequency Inverter DF51... - Moeller.com.tr

Serial interface (Modbus)04/07 AWB8230-1541GBException signal (error code)In the Modbus protocol only the master manages the dataexchange. It addresses each slave separately and waits for aresponse (except in broadcasting, in which it does not wait for areply).If the slave does not respond within a specified time (the latency),the master declares it not present. If a transmission error occurs,the master repeats the request.If a slave receives an in<strong>com</strong>plete message it sends an exceptionmessage to the master. The master then decides whether itresends the data or not.The exception message contains the following fields:• Address (slave)• Function code• Error code• CRC-16The function code of the exception message is formed by adding80 hex to the request’s function code.Saving new register data (ENTER function)The data transmitted to the frequency inverter with function“Force single register” or “Force multiple registers” (06 hex , 10 hex )is initially saved only in temporary memory. If the frequencyinverter is switched off (POWER = Off), this data is lost. After arestart, the frequency inverter would then load the previouslysaved data.With the ENTER function, the new data is saved permanently.Sending the ENTER signalWrite the selected data to holding register 0901hex with function“Force single register” (06 hex ).hThe ENTER function requires a long time. You can queryits status with the “Force data” coil (001A hex ).The frequency inverter’s memory has a limited service life(about 100000 write cycles). Frequent use of the ENTERfunction reduces its lifespan.Function codeRequesthexException responsehex01 1103 1305 1506 160F1F10 90The error code describes the reason for the exception response:Error codehexDescription01 The function is not supported.02 The address was not found.03 The data format is not permissible or is incorrect.21 The number of the holding register is too high.22 The register’s content must not be changedwhile the frequency inverter is in RUN mode:• The function sends an ENTER signal duringoperation.• The function writes to the register duringoperation.• The function writes to read-only register orcoils.156