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Selection of operation mode and operation location
4.23.3 Start command source and frequency command source during
communication operation (Pr. 338, Pr. 339, Pr. 550, Pr. 551)
(1) Select the command source of the Network operation mode (Pr. 550)
⋅ Either the RS-485 terminals or communication option can be specified as the command source in the Network
operation mode.
⋅ For example, set Pr. 550 to "1" when executing parameter write, start command or frequency command from the
inverter RS-485 terminals in the Network operation mode independently of whether the communication option is
connected or not.
When the RS-485 terminals or communication option is used, the external operation command and speed
command can be valid. Command source in the PU operation mode can be selected.
Parameter
Number
Name
Initial
Value
Setting
Range
Description
338
Communication operation
command source
0
0
Start command source communication
1
Start command source external
339
Communication speed
command source
0
0
Frequency command source communication
1 Frequency command source external
2
Frequency command source external (Frequency command from
communication is valid, frequency command from terminal 2 is invalid)
550
*
NET mode operation
command source
selection
9999
0
The communication option is the command source when NET
operation mode.
1
RS-485 terminals are the command source when NET operation mode.
9999
Automatic communication option recognition
Normally, the RS-485 terminals are the command source. When a
communication option is mounted, the communication option is the
command source.
551 *
PU mode operation
command source selection
9999
1
RS-485 terminals are the command source when PU operation mode.
2 PU connector is the command source when PU operation mode.
3
USB connector is the command source when PU operation mode.
9999
USB automatic recognition
Normally, the PU connector is the command source. During USB
connection, the USB connector is the command source.
The above parameters can be set whenever the communication option is connected. (Refer to page 308.)
* This parameter allows its setting to be changed in any operation mode even if "0 (initial value)" is set in Pr. 77 Parameter write selection.
...............Specifications differ according to the date assembled. Refer to page 484 to check the SERIAL number.
CAUTION
⋅ Since Pr. 550 = "9999" (automatic recognition of the communication option) in the initial setting, parameter write, start command
and frequency command cannot be executed by communication using the inverter RS-485 terminals when the communication
option is fitted. (Monitor and parameter read can be performed.)