Omron SYSMAC CJ1W-SCU21-V1, Operation Manual

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Communications Frames Section 6-8
Sending Host Link FINS Commands
• Set any FINS command code in S.
• Be sure to set the Host Link unit number (0 to 31) incremented by one (1
to 32) for the PLC slave corresponding to the send destination node
address in C+3 bits 08 to 15.
Example of Sending Host Link FINS Commands Using CMND(490)
The following example is for sending FINS commands to a CS/CJ-series PLC
connected to the Serial Communications Unit through an RS-422A/485 com-
munications path via an Ethernet network.
Example: The CMND(490) instruction is executed in the PLC on the Ethernet.
The FINS command (e.g., OPERATING MODE CHANGE STOP: 0402 hex) is
sent to the CS/CJ-series PLC (Host Link unit number = 1) that is connected to
port 2 (unit address = 81 hex + 4 hex
×
unit number 6 = 99 hex = 153 decimal,
corresponding to network address 5 in the routing tables) of the Serial Com-
munications Unit (unit number 6) that is connected to the PLC on the Ether-
net. Routing is performed between the networks, so use the setting for routing
tables.
Settings
• FINS Network Settings
Item Value (example) Setting location
Send destination network
address
(network address allocated
to target serial port in routing
tables) Network address for
serial communica-
tions path allocated
in local network
table settings is 5 • Set 05 hex in bits 00 to 07 (net-
work address) of control data
C+2 in the CMND(490) instruc-
tion.
Note Set 0 hex in bits 08 to 11
(serial port number) of
control data C+2 in the
CMND(490) instruction
Send destination node
address
(unit number for Host Link of
PLC connected to target
serial port + 1) Remote PLC unit
number for Host
Link: 1
Therefore, set 1+1
= 2 • Set 02 hex in bits 08 to 15
(send destination node
address) of control data C+3 in
the CMND(490) instruction.
Send destination unit
address
(unit address of remote unit
on PLC connected to target
serial port) CPU Unit: 00 hex • Set 00 hex in bits 00 to 07 of
control data C+3 in the
CMND(490) instruction.
Network (Ethernet)
Serial Communications Unit
Unit No. 6, port 2
Ethernet unit
node address: 4
Port 2 unit address:
81 hex + 4 hex
×
unit
No. 6 = 99 hex
(153 decimal), which
corresponds to network
address 5.
Unit No. for Host Link = 0 Unit No. for Host Link = 1 Unit No. for Host Link = 2
Host Link
header FINS
command
Terminator
Unit No. Network address
Serial port unit
address: 153
FINS command
FINS message
RS-422A/485 (Host Link)
CS/CJ-series or
CVM1/CV-series PLC
(Host Link slave)
CPU Unit
CMND
instruction
E.g., Operation mode change
(operation stopped): 0402 hex
Protocol
conversion
Local
network
table
Serial port network
address: 5