Mitsubishi Electronics FR-S500 · When the setting is 0, RS-485 communication is disabled

Communication parameters

7)Open cable detection (Communication parameter n6 "communication check time interval")

·If disconnection (communication stop) is detected between the inverter and computer as a result of disconnection check, a communication error (OPT) occurs and the inverter output is shut off.

·Disconnection check is made when the setting is any of "0.1s" to "999s". To make disconnection check, it is necessary to send data (control code refer to page 136) from the computer within the communication check time interval. (The send data has nothing to do with the station number)

·Communication check is performed in computer link operation mode from at the first communication.

·When the setting is "---", communication check (disconnection detection) is not made.

·When the setting is "0", RS-485 communication is disabled.

Example: When communication parameter n6= "0.1 to 999"

Operation Mode External Computer link

Computer

Inverter

Inverter

Computer

n6

Communication check counter

ENQ

Alarm(E.OPT)

Check start

Time

138