Omron SYSMAC CJ1W-SCU21-V1, Operation Manual

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Communications Frames Section 6-8
List of Settings
• FINS Network Settings
• Modbus-RTU Settings
Command Frame
2804
FINS header
Network (Ethernet)
FINS message
Modbus-RTU command
FINS message
Network (Controller Link)
Network address: 2
Serial Communications Unit
Unit No. 3, port 1
Conversion Link Unit
Node address: 5
Port 1 unit address:
80 hex + 4 hex
×
unit number 3 = 8C hex
RS-485 (Modbus-RTU)
3G3MV OMRON Inverter
CPU Unit
CMND
instruction
FINS header
2804
Modbus-RTU command
Protocol
conversion
Modbus-RTU command
Example: Write data for frequency reference value
(FUNCTION code 10 hex, register No. 0002 hex)
Item Value
(Example)
Setting location
Send destination network address
(Controller Link network address of PLC
to which Serial Communications Unit is
mounted) 2 Set 02 hex in the control data C+2 bits 00 to 07 (net-
work address) of CMND(490).
Note: Set 0 hex in the control data C+2 bits 08 to 11
(serial port number) of CMND(490).
Send destination node address
(node address in Controller Link for PLC
to which Serial Communications Unit is
mounted) 5 Set 05 hex in the control data C+3 bits 08 to 15 (send
destination node address) of CMND(490).
Serial Communications Unit unit num-
ber 3 Use to calculate the following unit address for the
serial port
80 hex + 4 hex
×
unit number 3 = 8C hex
Serial Communications Unit serial port Port 1
Send destination unit address
(unit address of serial port on Serial
Communications Unit)
80 hex + 4 hex
×
unit
number 3 = 8C hex (or
10 + unit number 3 = 13
hex, and serial port
number 1 = 1 hex)
Set 8C hex in the control data C+3 bits 00 to 07 (send
destination unit address) of CMND(490).
(Alternatively, set 13 hex in the control data C+3 bits
00 to 07 (send destination unit address) and set 1 hex
in C+2 bits 08 to 11 (serial port number).)
Item Set
value
Setting location
FINS command code: Converting
to Modbus-RTU = 2804 hex 2804
hex Set 2804 hex in controller data s of the
CMND(490) instruction.
Modbus slave address (e.g., 02
hex) 02
hex Set 0210 hex in controller data s+1 of
the CMND(490) instruction.
FUNCTION code: DATA WRITE =
10 hex 10
hex
Write data register No. (e.g., fre-
quency reference = 0002 hex) 0002
hex Set 0002 hex in controller data s+2 of
CMND(490).