Mitsubishi Electric 800 Series Instruction Manual page 61

Pr.
Pr. Name
group
Communication error
343 N080
count
MODBUS RTU
539 N002 communication check
time interval
549 N000 Protocol selection
NOTE
• To use the MODBUS RTU protocol, set "1" to Pr.549 Protocol selection
• If MODBUS RTU communication is performed from the master to the address 0 (station number 0), the data is
broadcasted, and the inverter does not send any reply to the master. To obtain replies from the inverter, set Pr.331
RS-485 communication station number ≠ "0 (initial value)".
Some functions are disabled in broadcast communication. (Refer to
• If a communication option is mounted with Pr.550 NET mode operation command source selection = "9999 (initial
value)", commands (operation commands) transmitted via RS-485 terminals become invalid. (Refer to the Instruction
Manual (Detailed) of the inverter.)
60
PARAMETER
Initial
Setting range
value

0
0
999
0.1 to 999.8 s
9999
0
0
1
Description
Displays the communication error count during MODBUS RTU
communication. Read-only.
MODBUS RTU communication, but the inverter trips in the NET
operation mode.
Set the interval of the communication check (signal loss detection)
time.
If a no-communication state persists for longer than the
permissible time, the inverter will trip.
No communication check (signal loss detection)
Mitsubishi inverter protocol (computer link)
MODBUS RTU protocol
.
page 65.)