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Selection of operation mode and
operation location
4.18.3 Start command source and speed 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 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.
(2) Select the command source of the PU operation mode (Pr. 551)
⋅ Either the PU connector or RS-485 terminals can be specified as the source in the PU operation mode.
⋅ When performing parameter write, giving start command and frequency command from communication with the
RS-485 terminals in PU operation mode, set "1" in Pr. 551.
*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.
When the RS-485 terminals or communication option is used, the external start command and frequency
command can be valid. Also, the 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, 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
2
1
RS-485 terminals are the command source when PU operation mode.
2
PU connector is the command source when PU operation mode.
The above parameters can be set when Pr. 160 User group read selection = "0". However, the parameters can be set whenever the communication
option is connected. (Refer to page 190.)
* Pr 550 and Pr. 551 are always write-enabled.
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.)
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.
Pr. 550
Setting
Pr. 551
Setting
Command Source
Remarks
PU connector RS-485 terminals Communication option
0
1 ×
PU operation mode
*1
NET operation mode *2
2 (initial value) PU operation mode × NET operation mode *2
1
1 ×
PU operation mode
*1
×
Switching to NET
operation mode disabled
2
(initial value) PU operation mode NET operation mode ×
9999
(initial value)
1 × PU operation mode *1 NET operation mode *2
2 (initial value) PU operation mode
× NET operation mode
Communication option fitted
NET operation mode ×
Communication option not
fitted