Mitsubishi Electric 800 Series Instruction Manual page 24

Pr.550 Pr.551
setting setting
PU connector

1
2 PU operation mode
9999
(initial
value)

3
9999
PU operation
(initial
mode

value)

The MODBUS RTU protocol cannot be used in the PU operation mode. To use the MODBUS RTU protocol, set Pr.551="2".

If the communication option is not mounted, switching to the Network operation mode is not longer possible.

When Pr.551= "9999", the priority of the PU command source is USB connector > PU connector.
Command source
USB connector RS-485 terminals
PU operation

mode



NET operation
mode

PU operation mode
NET operation
mode

PU operation
mode

NET operation
mode
Remarks
Communication
option
NET operation
mode

NET operation With communication
mode option

Without communication

option
NET operation With communication
mode option

Without communication

option
NET operation With communication
mode option

Without communication

option
PARAMETER
4
23