Mitsubishi Electric FR-F820-04750 Instruction Manual page 290

(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.
NOTES 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
setting
0
1
9999
(initial
value)
Tab. 5-58:
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.
5 - 128
Pr. 551
setting
PU connector USB connector
1 ×
PU operation
2
mode
3 ×
9999
PU operation
(initial
mode
value)
1 ×
PU operation
2
mode
3 ×
9999
PU operation
(initial
mode
value)
1 ×
PU operation
2
mode
3 ×
9999
PU operation
(initial
mode
value)
Parameter 550 and 551 settings
Command source
RS-485 terminals
PU operation
×
mode
× ×
PU operation
×
mode
PU operation
×
mode
PU operation
×
mode
NET operation
×
mode
PU operation NET operation
mode mode
PU operation
NET operation
mode
mode
PU operation
×
mode
×
×
NET operation
mode
×
PU operation
mode
NET operation
mode
×
PU operation
mode
NET operation
mode
Parameters
Remarks
Communication
option
NET operation
mode
NET operation
mode
NET operation
mode
NET operation
mode
Switching to NET
× operation mode
disabled
×
×
×
NET operation
mode
NET operation
With communication
option
mode
Without
× communication
option
NET operation
With communication
option
mode
Without
× communication
option
NET operation
With communication
option
mode
Without
× communication
option