Start Command Source And Speed Command Source During Communication Operation (Pr. 338, Pr. 339, Pr. 550, Pr. 551) - Mitsubishi F700 Series Instruction Manual

4.18.3 Start 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 start command and frequency
command can be valid. Also, the 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 185.)
* Pr 550 and Pr. 551 are always write-enabled.
(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.
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.)
(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.
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
(initial value) 2 PU operation mode
(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
Command 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
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
invalid)
The communication option is the command source when NET
operation mode.
RS-485 terminals are the command source when NET operation mode.
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.
RS-485 terminals are the command source when PU operation mode.
PU connector is the command source when PU operation mode.
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
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