Mitsubishi Electric FR-E720-0.1K(SC) Instruction Manual page 244

Communication operation and setting
(7) Pr. 343 Communication error count
You can check the cumulative number of communication errors.
Parameter
343
NOTE
The number of communication 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.
(8) Output terminal LF "alarm output (communication error warnings)"
During a communication error, the alarm signal (LF signal) is output by open collector output. Assign the used terminal
using any of Pr. 190 to Pr. 192 (output terminal function selection).
Master
Alarm data
Slave
Communication
Error count
(Pr. 343)
OFF
LF signal
NOTE
The LF signal can be assigned to the output terminal using any of Pr.190 to Pr.192. Changing the terminal assignment
may affect the other functions. Set parameters after confirming the function of each terminal.
244
Setting Range
(Reading only)
Alarm data Normal data
Not increased
0
ON
Communication error count is increased
in synchronization with leading edge
of LF signal
Minimum
Initial Value
Setting Range
1 0
Alarm data
Reply data
1
OFF
Turns OFF when normal data is received
Alarm data: Data resulting in communication error.
Normal data
Reply data
2
OFF
ON