Mitsubishi Electric FR-F820-00046 Instruction Manual page 492

• Communication check is started at the first communication in the operation mode having the operation source (PU
operation mode for PU connector communication in the initial setting or Network operation mode for RS-485 terminal
communication).
Example: PU connector communication, Pr. 122 = "0.1 to 999.8s"
Operation Mode
Computer Inverter
Computer
Inverter
Communication
check counter
ALM
 Programming instructions
• When data from the computer has any error, the inverter does not accept that data. Hence, in the user program, always
insert a retry program for data error.
• All data communication, for example, run command or monitoring, are started when the computer gives a communication
request. The inverter does not return any data without the computer's request. Hence, design the program so that the
computer gives a data read request for monitoring, etc. as required.
• Program example: To switch to the Network operation mode
External
PU
Pr.122
OFF
Check start
5.12 (N) Communication operation parameters
Fault (E.PUE)
Time
ON
5. PARAMETERS
1
2
3
4
5
6
7
8
9
10
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