FR-A701 INSTRUCTION MANUAL (Applied) - Automation Systems ...

4PARAMETERSCommunication operation and setting[RS-485 terminal communication related parameter]ParameterNumber331NameRS-485 communication stationnumberInitialValue332 RS-485 communication speed 96333 *2334335 *3336 *3337 *3341 *3RS-485 communication stop bitlengthRS-485 communication paritycheck selectionRS-485 communication retrycountRS-485 communication checktime intervalRS-485 communication waitingtime settingRS-485 communication CR/LFselection0Setting Range0 to 31 (0 to 247)*13, 6, 12, 24, 48,96, 192, 3841 0, 1, 10, 112 0, 1, 21 0 to 10, 99990s999900.1 to 999.8s99990 to 150ms,99991 0, 1, 2DescriptionSet the inverter station number. (samespecifications as Pr. 117)Used to select the communication speed.(same specifications as Pr. 118)Select stop bit length and data length. (samespecifications as Pr. 119)Select the parity check specifications. (samespecifications as Pr. 120)Set the permissible number of retries atoccurrence of a data receive error.(same specifications as Pr. 121)RS-485 communication can be made, but theinverter will come to trip in the NET operationmode.Set the interval of communication check(signal loss detection) time. (samespecifications as Pr. 122)No communication check (signal lossdetection)Set the waiting time between datatransmission to the inverter and response.(same specifications as Pr. 123)Select presence/absence of CR/LF.(same specifications as Pr. 124)549 Protocol selection 00 Mitsubishi inverter (computer link) protocol1 Modbus-RTU protocol *4*1 When "1" (Modbus-RTU protocol) is set in Pr. 549, the setting range within parenthesis is applied.*2 For the Modbus-RTU protocol, the data length is fixed to 8 bits and the stop bit depends on the Pr. 334 setting. (Refer to page 316)*3 The Modbus-RTU protocol becomes invalid.*4 The Modbus-RTU protocol is valid for only communication from the RS-485 terminals.⋅⋅CAUTIONIf communication is made without Pr. 336 RS-485 communication check time interval being changed from "0" (initial value), monitor,parameter read, etc. can be performed, but the inverter results in a fault as soon as it is switched to the NET operation mode. Ifthe operation mode at power on is the network operation mode, a communication fault (E.SER) occurs after firstcommunication.When performing operation or parameter write through communication, set "9999" or a greater value to Pr. 336. (The settingdepends on the computer side program.) (Refer to page 308)Always reset the inverter after making the initial settings of the parameters. After you have changed the communication-relatedparameters, communication cannot be made until the inverter is reset.4.24.4 Communication EEPROM write selection (Pr. 342)When parameter write is performed from the inverter PU connector, RS-485 terminal, and communication option,parameters storage device can be changed from EEPROM + RAM to RAM only. Set this parameter whenfrequent parameter changes are required.⋅ParameterNumber342NameCommunication EEPROM writeselectionInitial ValueSettingRangeThe above parameters can be set any time when the communication option is connected. (Refer to page 281)0DescriptionWhen changing the parameter values frequently, set "1" in Pr. 342 to write them to the RAM. The life of the EEPROM willbe shorter if parameter write is performed frequently with the setting unchanged from "0 (initial value)" (EEPROM write).01Parameter values written by communication arewritten to the EEPROM and RAM.Parameter values written by communicationare written to the RAM.REMARKS⋅ When Pr. 342 is set to "1" (only RAM write), the new values of the parameters will be cleared at power supply-off of the inverter.Therefore, the parameter values available when power is switched on again are the values stored in EEPROM previously.303