FPΣ
Communication Function 1 Computer Link
8-18
8.3 Computer Link (1:N communication)
This section explains about the 1:N communication of computer link.
8.3.1 Overview of 1:N Communication
For a 1:N computer link, the computer and the FPΣ are connected through a
commercially available RS232C-RS485 conversion adapter, and the respective PLCs
are wired using an RS485 cable.
Communication is carried out by the command specifying the unit number being sent
from the computer side, and the PLC with that unit number sending a response back
to the computer.
RS232C
RS485
Computer
Commercially
available
conversion
adapter
Unit No.1 Unit No.2 Unit No.3 Unit No.4
The unit number for the PLC to which the command
is being sent is included in the command message.
The unit number of the PLC sending a response is
included in the response message.
Figure 156: FPΣ Overview of compute link function (1:N communication)
If the FP
Σ
is used in combination with a communication cassette (the 1-channel
RS485 type), no C-NET adapter is necessary on the PLC side.
Tip
8.3.2 Communication Cassette Used for 1:N Communication
The following types of communication cassettes can be used for 1:N communication
with a computer link.
Name Description Part No.
FPΣ Communication cassette
1-channel RS485 type
This communication cassette is a 1-channel unit with a
two-wire RS485 port. It supports 1:N computer links (C-
NET), general-purpose serial communication, and a PLC
link.
FPG-COM3
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