Initial Setting Of Operation Via Communication - Mitsubishi Electric 800 Series Instruction Manual

(N) Operation via communication and its settings
5.15.3

Initial setting of operation via communication

Set the action when the inverter is performing operation via communication.
• Set the 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
342 Communication
N001 EEPROM write selection
Communication reset
349 selection/Ready bit

status selection
Communication reset
N010

selection
Ready bit status
N240

selection
500 Communication error
N011 execution waiting time

Communication error
501
occurrence count
N012

display
502 Stop mode selection at
N013 communication error
Operation frequency
779
during communication
N014
error

The setting is available only when a communication option is installed.

If in communication by the communication option, E.OP1 is displayed.

The setting is available when the HMS network option is installed.
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) Mitsubishi inverter protocol (computer link)
1 MODBUS RTU protocol
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 from EEPROM + RAM to RAM only. 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.)
546
PARAMETERS
Initial
value
0
0
1
0
0
1
0
1
0
100, 101
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
Setting
range
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.
The status of Ready bit in communication data can be

selected.
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 to be run at a communication error
occurrence.
The motor runs at the frequency used before the
communication error.
Description