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4.18.3 Operation command source and speed command source during
communication operation (Pr. 338, Pr. 339, Pr. 550, Pr. 551)
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
Name
Number
Communication operation
338
command source
Communication speed
339
command source
NET mode operation
command source
550 *
selection
PU mode operation
551 *
command source selection
The above parameters can be set whenever the communication option is connected. (Refer to page 180.)
* Pr 550 and Pr. 551 are always write-enabled.
(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.
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.)
(2) Select the control source of the PU operation mode (Pr. 551)
⋅ Either the PU connector, RS-485 terminals 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.
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
Pr. 551
Setting
Setting
PU connector
1
0
2
(initial
PU operation mode
value)
1
1
2
(initial
PU operation mode
value)
1
9999
(initial
2
(initial
PU operation mode
value)
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.
Initial
Setting
Value
Range
0
0
1
0
1
0
2
0
1
9999
9999
1
2
2
3
Operation Mode of Control Source
RS- 485 terminals
×
PU operation mode
×
×
PU operation mode
NET operation mode
×
PU operation mode
×
NET operation mode
Selection of operation mode and operation location
Description
Operation command source communication
Operation command source external
Speed command source communication
Speed command source external (Frequency setting from
communication is invalid, terminal 2 and 1 setting from external is valid)
Speed command source external (Frequency setting from
communication is valid, terminal 2 and 1 setting from external is invalid)
Communication option valid
RS-485 terminals valid
Automatic recognition of the communication option
Normally, the RS-485 terminals are valid. When the communication
option is fitted, the communication option is valid.
Select the RS-485 terminals as the PU operation mode control source.
Select the PU connector as the PU operation mode control source.
Manufacturer setting. Do not set.
Communication option
NET operation mode
*1
NET operation mode
×
*1
×
NET operation mode
*1
NET operation mode
×
Remarks
*2
*2
Switching to NET operation
mode disabled
*2
Communication option fitted
*2
Communication option not
fitted
191
4
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