Mitsubishi Electric 800 Series Instruction Manual page 303

(D) Operation command and frequency command
Selection of the command source of the PU operation mode (Pr.551)
• Any of the PU connector, RS-485 terminals, or USB connector can be specified as the command source in the PU
operation mode.
• Set Pr.551="1" to use communication connected to the RS-485 terminals to write parameters or execute start and
frequency commands in the PU operation mode. Set Pr.551="3" or "9999" to use the USB connector.
NOTE
• When Pr.550 ="1" (NET mode RS-485 terminals) and Pr.551 ="1" (PU mode RS-485 terminals), the PU operation mode has
a precedence. For this reason, if the communication option is not mounted, switching to the Network operation mode is not
longer possible.
• Changed setting values are enabled at power-ON or inverter reset.
Pr.550 Pr.551
setting setting
PU connector

1
2 PU operation mode
0

3
9999
PU operation
(initial
mode
value)

1
2 PU operation mode
1

3
9999
PU operation
(initial
mode
value)

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.
302
PARAMETERS
Command source
USB connector


PU operation mode
PU operation
mode
 


PU operation mode
PU operation
mode
 


PU operation mode
PU operation
mode
 
RS-485 Communication
terminals option
PU operation NET operation
mode mode
 
NET operation

mode

NET operation

mode

NET operation

mode

PU operation

mode

NET operation

mode
NET operation

mode
NET operation

mode
PU operation NET operation
mode mode
 
NET operation

mode

NET operation

mode
NET operation

mode

NET operation

mode
NET operation

mode

NET operation

mode
REMARKS
Switching to NET
operation mode disabled
With communication
option
Without communication
option
With communication
option
Without communication
option
With communication
option
Without communication
option