Mitsubishi Electric 800 Series Instruction Manual page 216

 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

0 1
2 PU operation mode

3
9999 PU operation
(initial *3
mode
value)

1 1
2 PU operation mode

3
9999 PU operation
(initial *3
mode
value)

9999 1
(initial
value)
2 PU operation mode

3
9999 PU operation
(initial
*3
mode
value)
*1 The MODBUS RTU protocol cannot be used in the PU operation mode. To use the MODBUS RTU protocol, set Pr.551="2".
*2 If the communication option is not mounted, switching to the Network operation mode is not longer possible.
*3 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
*1
mode
 

PU operation mode

PU operation
*3
mode

PU operation
*1
mode

NET operation
mode
PU operation mode NET operation
mode
PU operation NET operation
*3 mode
mode

PU operation
*1
mode
 
NET operation
mode

PU operation mode
NET operation
mode

PU operation
*3
mode
NET operation
mode
Communication
option
NET operation
*2
mode
NET operation
*2
mode
NET operation
*2
mode
NET operation
*2
mode

Switching to NET
operation mode disabled



NET operation
*2
mode
NET operation With communication
option
*2
mode

Without communication
option
NET operation With communication
*2 option
mode

Without communication
option
NET operation With communication
option
*2
mode

Without communication
option
5.6 (D) Operation command and frequency command
3
4
5
5
Remarks
5
6
7
8
9
10
215
5. PARAMETERS