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Serial Communications Section 6-3
6-3-1 Host Link Communications
The following table shows the host link communication functions available in
CS/CJ PLCs. Select the method that best suits your application.
Note 1. The FINS command must have a host link header and terminator attached
before it is transmitted from the host computer.
Command flow Command type Communications method Configuration
Create frame in the host com-
puter and issue command to the
PLC. Receive the response from
the PLC.
Application:
Use this method when communi-
cating primarily from the host
computer to the PLC.
Create frame in the host com-
puter and issue command to the
PLC. Receive the response from
the PLC.
Application:
Use these methods when com-
municating primarily from the
host computer to PLCs in the
network.
Issue frame with the CPU Unit’s
SEND/RECV/CMND instruc-
tions. Receive response from the
host computer.
Application:
Use this method when communi-
cating primarily from the PLC to
the host computer to transmit
status information such as error
information.
Host computer
PLC
Host link command
Host link command
Directly connect the host computer in a 1:1
or 1:N system.
OR
Command
FINS command
1
(with host link header
and terminator)
Header
Terminator
FINS
Directly connect the host computer in a 1:1
or 1:N system.
OR
Command
Command
Communicate with other PLCs in the
network from the host computer. (Convert
from host link to network protocol.)
PLC
Host computer
FINS command
2
(with host link header
and terminator)
Header
Terminator
FINS
Directly connect the host computer in a 1:1
system.
SEND/RECV/
CMND
Command
SEND/RECV/
CMND
Command
Communicate with the host computer
through other PLCs in the network. (Convert
from host link to network protocol.)
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