Mitsubishi Electric FR-F800 Series Instruction Manual page 501

5.12.3 Initial setting of operation via communication
Set the action when the inverter is performing operation via communication.
• Set the RS-485 communication protocol. (Mitsubishi inverter protocol / MODBUS RTU protocol)
• Set the action at fault occurrence or at writing of parameters.
Pr. Name
549
Protocol selection
N000
Communication
342
EEPROM write
N001
selection
502 Stop mode selection at
N013 communication error
Operation frequency
779
during communication
N014
error
 Setting the communication protocol (Pr.549)
• Select the communication protocol.
• The MODBUS RTU protocol can be used by communication from the RS-485 terminals.
Pr.549 setting
0 (initial value)
1
2
 Communication EEPROM write selection (Pr.342)
• When parameter write is performed via the inverter PU connector, RS-485 terminal, USB communication, or a
communication option, the parameters storage device can be changed to RAM only from both EEPROM and RAM. Use
this function if parameter settings are changed frequently.
• When changing the parameter values frequently, set "1" in Pr.342 Communication EEPROM write selection to write
them to the RAM only. The life of the EEPROM will be shorter if parameter write is performed frequently with the setting
unchanged from "0 (initial value)" (EEPROM write).
NOTE
• Turning OFF the inverter's power supply clears the modified parameter settings when Pr.342 = "1 (write only to RAM)".
Therefore, the parameter values at next power-ON are the values last stored in EEPROM.
• The parameter setting written in RAM cannot be checked on the operation panel. (The values displayed on the operation panel
are the ones stored in EEPROM.)
500
5. PARAMETERS
5.12 (N) Communication operation parameters
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Setting
Initial value
range
0
0 1
2
0
0
1
0 0 to 4
0 to 590 Hz
9999
9999
Communication protocol
Mitsubishi inverter protocol (computer link)
MODBUS RTU protocol
BACnet MS/TP protocol
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Description
Mitsubishi inverter protocol (computer link)
MODBUS RTU protocol
BACnet MS/TP protocol
Parameter values written by communication are written to the EEPROM and
RAM.
Parameter values written by communication are written to the RAM.
Select the operation at a communication error occurrence.
Set the frequency for the operation when a communication error occurs.
Operation continues at the same frequency before the communication error.