Mitsubishi Electric FR-A700 Instruction Manual page 610

Selection of operation mode and operation location
Select the control source of the PU operation mode (Pr. 551)
Either the PU connector or inverter RS-485 terminals can be specified as the source of control
in the PU operation mode.
In the PU operation mode, set Pr. 551 to "1" when executing parameter write, start command or
frequency setting through communication from the unit RS-485 terminals. Set Pr. 551 to "3" for
communication from the USB connector.
NOTE The PU operation mode has a higher priority when Pr. 550 = 1 (NET mode RS-485 termi-
nals) and Pr. 551 = 1 (PU mode RS-485 terminals). When the communication option is not
fitted, therefore, the operation mode cannot be switched to network operation mode.
Changed setting value is made valid when powering on or resetting the inverter.
Pr. 550
0
1
9999
(initial
valu)
Tab. 6-125: Parameter 550 and 551 settings
The Modbs-RTU protocol cannot be used in the PU operation mode. When using the
Modbus-RTU protocol, set Pr. 551 to "2".
When the communication option is not fitted, the operation mode cannot be switched to
network operation mode.
6 - 430
Operation Mode of Control Source
Pr. 551
PU
connector connector
1 —
2 PU
(initial operation
value) mode
3 — operation
1 —
2 PU
(initial operation
value) mode
3 — operation
1 —
2 PU
(initial operation
value) mode
3 — operation
USB RS-485
terminals
PU
— operation
mode
— —
PU
—
mode
PU
— operation
mode
NET
— operation
mode
PU NET
operation
mode mode
PU
— operation
mode
—
—
NET
operation
mode
—
PU
NET
mode
operation
mode
Parameter
Remarks
Communication
option
NET
operation mode
NET
operation mode
NET
operation mode
Switching to NET
— operation mode
disabled
—
—
NET
operation mode
Communication
NET
operation mode
option fitted
Communication
—
option not fitted
Communication
NET
operation mode
option fitted
Communication
—
option not fitted