Mitsubishi Electric FR-A800 Series Instruction Manual page 665

• 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
Communication reset
*1
selection/Ready bit
349
status selection
Communication reset
*1
N010
selection
Ready bit status
*1
N240
selection
500
Communication error
*1
execution waiting time
N011
Communication error
501
occurrence count
*1
N012
display
502 Stop mode selection at
N013 communication error
Operation frequency
779
during communication
N014
error
*1 The setting is available only when a communication option is installed.
*2 If in communication by the communication option, "E.OP1" is displayed.
 Setting the communication protocol (Pr.549)
• Select the RS-485 communication protocol.
• The MODBUS RTU protocol can be used by communication from the RS-485 terminals.
Pr.549 setting
0 (initial value)
1
 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 "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.)
 Operation selection at a communication error (Pr.502, Pr.779)
• For communication using RS-485 terminals or a communication option, operation at a communication error can be
selected. The operation is active under the Network operation mode.
664
5. PARAMETERS
5.15 (N) Communication operation parameters
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Initial value Setting range
0
0
1
0
0
1
0
1
100, 101
1000, 1001,
0
1100, 1101,
10000, 10001,
10100, 10101,
11000, 11001,
11100, 11101
0
0
1
0
0
1
0 0 to 999.8 s
0 0
0 0 to 4, 11, 12
0 to 590 Hz
9999
9999
Communication protocol
Mitsubishi inverter protocol (computer link)
MODBUS RTU protocol
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Description
Mitsubishi inverter protocol (computer link)
MODBUS RTU protocol
Parameter values written by communication are written to the EEPROM
and RAM.
Parameter values written by communication are written to the RAM.
Enables the error reset function in any operation mode.
Enables the error reset function only in the Network operation mode.
For details, refer to page 895 and
For details, refer to page 893.
Enables the error reset function in any operation mode.
Enables the error reset function only in the Network operation mode.
The status of Ready bit in communication data can be changed when an
HMS network option is installed.
Set the time from when the communication line error occurs until the
inverter starts the operation for the communication error (when a
communication option is used).
Displays the communication error occurrence count (when a
communication option is used).
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.
page 897.