Mitsubishi Electric FR-A800 Series Instruction Manual page 680

• 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).
Computer
Inverter
 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
Downloaded from ManualsNet.com
Example: PU connector communication, Pr. 122 = "0.1 to 999.8s"
External
Operation Mode
Inverter
Computer
Pr.122
Communication
check counter
ALM
search engine
PU
Check start
OFF
5.15 (N) Communication operation parameters
Fault (E.PUE)
Time
ON
5. PARAMETERS
1
2
3
4
5
6
7
8
9
10
679