Mitsubishi Electric FR-A720-0.4K Instruction Manual page 345

1) Pr. 343 Communication error count
You can check the cumulative number of communication errors.
Parameters
343
CAUTION
The number of commnication errors is temporarily stored into the RAM. As it is not stored into the EEPROM, performing
a power supply reset or inverter reset clears the value to 0.
2) Output signal LF "minor failure output(communication error warnings)"
During a communication error, the minor failure output (LF signal) is output by open collector output. Assign
the used terminal using any of Pr. 190 to Pr. 196 (output terminal function selection).
Master
Alarm data
Slave
Communication
0
Error count
(Pr.343)
OFF
Signal LF
CAUTION
The LF signal can be assigned to the output terminal using any of Pr. 190 to Pr. 196. When terminal assignment is changed, the
other functions may be affected. Please make setting after confirming the function of each terminal.
Setting Range Minimum Setting Range
(Read only)
Alarm data Normal data
Not increased
ON
Communication error count is increased in
synchronization with leading edge of LF signal
Communication operation and setting
1
Alarm data
Reply data
1
OFF
Turns off when normal data is received
Alarm data : Data resulting in
communication error.
Initial Value
0
Normal data
Reply data
2
OFF
ON
4
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