105
5. PARAMETERS
5.7 (N) Communication operation parameters
1
2
3
4
5
6
7
8
9
10
NOTE
• For branching, connect the wires as shown in the following table.
Two-wire type connection
• If the computer is 2-wire type, a connection from the converter can be changed to 2-wire type by passing wires across
reception terminals and transmission terminals of the RS-485 terminals.
NOTE
• A program should be created so that transmission is disabled (receiving state) when the computer is not sending and reception
is disabled (sending state) during sending to prevent the computer from receiving its own data.
5.7.3
Initial setting of operation via communication
Set the action when the converter unit is performing operation via communication.
• Set the RS-485 communication protocol. (Mitsubishi inverter protocol / MODBUS RTU protocol)
• Set the action at fault occurrence or at writing of parameters.
Setting the communication protocol (Pr.549)
• Select the RS-485 communication protocol.
• The MODBUS RTU protocol can be used by communication from the RS-485 terminals.
Communication EEPROM write selection (Pr.342)
• The parameter storage device can be changed from EEPROM and RAM to RAM only when writing parameters via the
converter unit's PU connector or RS-485 terminals. Use this function if parameter settings are changed frequently.
To receiving terminal
of the next converter unit
To sending terminal
of the next converter unit
To next converter unit
To earth (ground)
terminal
To computer send
To computer receive
To computer ground
TXD RXD
VCC
TXD RXD
VCC
TXD+
TXD-
RXD+
RXD-
SG
SG
Converter unit
Computer
Pass a wire
Transmission
enable
Reception
enable
Pr.
Name
Initial value
Setting
range
Description
549
N000
Protocol selection
0
0
Mitsubishi inverter protocol (computer link)
1
MODBUS RTU protocol
342
N001
Communication
EEPROM write
selection
0
0
Parameter values written by communication are written to the EEPROM and
RAM.
1
Parameter values written by communication are written to the RAM.
Pr.549 setting
Communication protocol
0 (initial value)
Mitsubishi inverter protocol (computer link)
1
MODBUS RTU protocol
Содержание FR-CC2-N Series
Страница 61: ...60 3 PRECAUTIONS FOR USE OF THE CONVERTER UNIT 3 4 Checklist before starting operation MEMO ...
Страница 137: ...136 5 PARAMETERS 5 10 Checking parameters changed from their initial values initial value change list MEMO ...
Страница 153: ...152 6 PROTECTIVE FUNCTIONS 6 6 Check first when you have a trouble MEMO ...
Страница 165: ...164 7 PRECAUTIONS FOR MAINTENANCE AND INSPECTION 7 2 Measurement of main circuit voltages currents and powers MEMO ...
Страница 171: ...170 8 SPECIFICATIONS 8 3 Outline dimension drawings MEMO ...