310
Selection of operation mode and operation location
4.23.3 Operation command source and speed command source during
communication operation (Pr. 338, Pr. 339, Pr. 550, Pr. 551)
(1) Select the control source of the network operation mode
(Pr. 550)
⋅
Either the RS-485 terminals or communication option can be specified as the source of control in network operation mode.
⋅
For example, set
Pr. 550
to "1" when executing parameter write, start command or frequency setting from the
inverter RS-485 terminals in the network operation mode independently of whether the communication option is
connected or not.
(2) Select the control source of the PU operation mode
(Pr. 551)
⋅
Any of the PU connector, RS-485 terminals, or USB connector 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.
*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 operation command and speed
command can be made valid. Also, the control 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
Operation command source communication
1
Operation command source external
339
Communication speed
command source
0
0
Speed command source communication
1
Speed command source external (Frequency setting from
communication is invalid, terminal 2 and 1 setting from external is valid)
2
Speed command source external (Frequency setting from
communication is valid, terminal 2 and 1 setting from external is invalid)
550
*
NET mode operation
command source
selection
9999
0
Communication option valid
1
RS-485 terminals valid
9999
Automatic recognition of the communication option
Normally, the RS-485 terminals are valid. When the communication
option is fitted, the communication option is valid.
551 *
PU mode operation
command source selection
2
1
Select the RS-485 terminals as the PU operation mode control source.
2
Select the PU connector as the PU operation mode control source.
3
Select the USB connector as the PU operation mode control source.
The above parameters can be set whenever the communication option is connected.
(Refer to page 299.)
*
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 setting 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.
⋅
Changed setting value is made valid when powering on or resetting the inverter.
Pr. 550
Setting
Pr. 551
Setting
Operation Mode of Control Source
Remarks
PU connector
USB 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
3
×
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
×
3
×
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
*2
Communication option fitted
NET operation mode
×
Communication option
not fitted
3
×
PU operation mode
×
NET operation mode
*2
Communication option fitted
NET operation mode
×
Communication option
not fitted
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