Operation Command Source And Speed Command Source During Communication Operation (Pr. 338, Pr. 339, Pr. 550, Pr. 551) - Mitsubishi Electric FR-F740-00023-EC Instruction Manual

3.17.3 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 when Pr. 160 User group read selection = "0". However, the parameters can be set whenever the communication
option is connected. (Refer to page 146.)
* 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 or RS-485 terminals can be specified as the source of control in the PU operation mode.
⋅ When performing parameter write, giving start command and setting frequency from communication with the RS-
485 terminals in PU operation mode, set "1" in Pr. 551.
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 Pr. 551
Setting Setting
1
0
2 PU operation mode
(initial value)
1
1
2 PU operation mode
(initial value)
1
9999
2 PU operation mode
(initial value)
(initial 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
Operation Mode of Control Source
PU connector RS-485 terminals
×
PU operation mode
×
PU operation mode
NET operation mode
× PU operation mode
NET operation mode
Selection of operation mode and
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.
Communication option
NET operation mode
*1
×
NET operation mode
×
*1
×
NET operation mode
*1
× NET operation mode
×
operation location
Remarks
*2
*2
Switching to NET
operation mode disabled
*2
Communication option fitted
Communication option not fitted
157
Pr.337
page 167
Pr.340
page 156
Pr.549
page 179
Pr.555
page 220
3