Mitsubishi Electric FR-D720S SC EC, Instruction Manual

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Parameter Communication operation and settings
FR-D700 SC EC 6 - 241
Communication error count (Pr. 343)
You can check the cumulative number of communication errors.
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, Pr. 192 or Pr. 197 "Output terminal function selec-
tion".
Parameter Setting Range Minimum Setting Range Initial Value
343 (Read only) 1 0
Tab. 6-86: Number of communication errors
NOTE
The number of communication errors is temporarily stored into the RAM. As it is not stored
into the E²PROM, performing a power supply reset or inverter reset clears the value to 0.
I001229E
Fig. 6-118: Output of the LF signal
NOTE The LF signal can be assigned to the output terminal using any of Pr. 190, Pr. 192 or Pr. 197.
Changing the terminal assignment using Pr. 190, Pr. 192 or Pr. 197 may affect the other
functions. Make setting after confirming the function of each terminal.
Master
Slave
Communication
Error count
(Pr. 343)
Signal LF
Alarm data Alarm data Normal data
Reply data
Normal data Alarm data
Reply data
OFF OFF OFF ON ON
Communication error count is increased in
synchronization with leading edge of LF signal
Turns off when normal data is received
Alarm data: Data resulting in
communication error.