Rockwell Automation 1775-KA PLC-3 Communication Adapter Module User Manual - Manual (Page 12)

Introduction
Chapter 1
1Ć8
The PLC–3 can support multiple 1775–KA modules in the same PLC–3
chassis. This provides the PLC–3 with concurrent access to several
independent Data Highways.
The 1775–KA module can also serve as an interface between the PLC–3
programmable controller and an intelligent RS–232–C compatible device
or any Allen–Bradley PC and its Data Highway module. Some examples
of this application of the module are the following:
Interfacing two PLC–3 controllers through a modem link
Interfacing a PLC–3 controller with a computer (either directly or
through modems)
Interfacing a PLC–3 controller with a remote Data Highway through a
modem link
Interfacing a PLC–3 controller as a slave station on a multipoint
modem link
Interfacing a PLC–3 controller on a point–to–point link with PLC–2
Family processor through a 1771–KG module (The 1772–LR processor
is not supported in this configuration.)
Figure 1.3 shows the 1775–KA module in a typical modem application.
Figure 1.3
Typical Modem Application
Modem
Computer
1775-KA Module
NOTE: Modems required
only
for distances greater
than 50 feet.
10002–I
PLC-3
Controller
Modem