Omron CP1H CPU UNITS - PROGRAMMING 05-2007, Operation Manual

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Serial Communications
Section 6-1
6-1-7 Host Link Communications
The following table shows the host link communication functions available in
CP1H PLCs. Select the method that best suits your application.
Command
flow
Command type Communications method Configuration
Create frame in the host com-
puter and send the command to
the PLC. Receive the response
from the PLC.
Application:
Use this method when commu-
nicating primarily from the host
computer to the PLC.
Create frame in the host com-
puter and send the 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.
Remarks:
The FINS command must be
placed between a Host Link
header and terminator and then
sent by the host computer.
Send the command frame with
the CPU Unit’s SEND, RECV, or
CMND instruction. Receive
response from the host com-
puter.
Application:
Use this method when commu-
nicating primarily from the PLC
to the host computer to transmit
status information, such as error
information.
Remarks:
The FINS command will be
placed between a Host Link
header and terminator when it is
sent. The FINS command must
be interpreted at the host com-
puter and then the host com-
puter must return a response.
Host computer
Host link command
(C Mode)
Host link command
OR
Command
Directly connect the host computer in a 1:1
or 1:N system.
FINS
Header Terminator
FINS command (with
Host Link header and
terminator) sent.
OR
Command
Directly connect the host computer in a 1:1
or 1:N system.
Command
Communicate with other PLCs in the
network from the host computer. (Convert
from Host Link to network protocol.)
Host computer
FINS
Header
Terminator
FINS command (with
Host Link header and
terminator) is sent.
SEND/RECV/
CMND
Command
Directly connect the host computer in a 1:1
system.
Command
Communicate with the host computer
through other PLCs in the network. (Convert
from Host Link to network protocol.)
SEND/RECV/
CMND