4.19.3 Start command source and frequency command source during communication
operation (Pr. 338, Pr. 339, Pr. 550, Pr. 551)
When the RS-485 communication with the PU connector or communication option is used, the external start command
and frequency command can be valid. Command source in the PU operation mode can be selected.
From the communication device, parameter unit, etc. which have command source, parameter write or start command
can be executed. Parameter read or monitoring can be executed in any operation mode.
NET mode operation
PU mode operation
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 179)
* Pr. 550 and Pr. 551 are always write-enabled.
Select the command source of the Network operation mode (Pr. 550)
Either the RS-485 communication with the PU connector or communication option can be specified as the command
source in the network operation mode.
For example, set Pr. 550 to "2" when executing parameter write, start command or frequency command from the unit RS-
485 terminals in the Network operation mode independently of whether the communication option is connected or not.
Since Pr. 550 = "9999" (automatic communication option recognition) in the initial setting, parameter write, start
command and frequency command cannot be executed by communication using the unit RS-485 terminals when the
communication option is fitted.
Selection of operation mode and operation location
Start command source communication
Start command source external
Frequency command source communication
Frequency command source external
Frequency command source external (Frequency command from
communication is valid, frequency command from terminal 2 is
The communication option is the command source when NET
PU connector is the command source when NET operation mode.
Automatic communication option recognition
Normally, PU connector is the command source. When a
communication option is mounted, the communication option is the
PU connector is the command source when PU operation mode.
USB connector is the command source when PU operation mode.
Operation panel is the command source when PU operation mode.
USB automatic recognition
Normally, operation panel is the command source. When the
parameter unit is connected to the PU connector, PU is the
command source. When USB is connected, USB connector is the