Mitsubishi Electric FR-A720-0.4K Instruction Manual page 334

(2) Select 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 the RS-485 terminals to write parameters or send start and frequency commands in the PU
operation mode. Set Pr.551="3 or 9999" to use the USB connector to do those in the PU operation mode.
CAUTION
⋅ The PU operation mode has a higher priority when Pr. 550 = "1" (NET mode RS-485 terminals) 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 valid when powering ON or resetting the inverter.
Pr. 550 Pr. 551
Setting Setting
PU connector
×
1
2 PU operation mode
×
3
0
9999
PU operation mode
(initial
*3
value)
×
1
2 PU operation mode
1
×
3
9999
PU operation mode
(initial
*3
value)
×
1
2 PU operation mode
9999
(initial
×
3
value)
9999
PU operation mode
(initial
*3
value)
*1 The Modbus-RTU protocol cannot be used in the PU operation mode. When using the Modbus-RTU protocol, set Pr. 551 to "2".
*2 When the communication option is not fitted, the operation mode cannot be switched to Network operation mode.
*3 When Pr. 551 = "9999", the priorities of the PU command source is USB connector > PU connector.
Command Source
USB connector RS-485 terminals Communication option
×
PU operation mode
×
PU operation mode
PU operation mode
*3
×
PU operation mode
×
NET operation mode
PU operation mode NET operation mode
PU operation mode
NET operation mode
*3
×
PU operation mode
×
NET operation mode
PU operation mode
NET operation mode
PU operation mode
*3
NET operation mode
Selection of operation mode and operation location
NET operation mode
*1
×
NET operation mode
×
NET operation mode
×
NET operation mode
×
*1
×
×
×
NET operation mode
*1
×
NET operation mode
×
×
NET operation mode
×
×
NET operation mode
×
Remarks
*2
*2
*2
*2
Switching to NET
operation mode disabled
*2
Communication option
*2
fitted
Communication option
not fitted
Communication option
*2
fitted
Communication option
not fitted
Communication option
*2
fitted
Communication option
not fitted
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