Rockwell Automation 1775-KA PLC-3 Communication Adapter Module User Manual - Manual (Page 21)

Installation
Chapter 2
2Ć9
Interfacing a PLC–3 controller to a PLC–2 Family processor through a
1771–KG module in a point–to–point link (Figure 2.6)
Figure 2.6
Linking a PLC-3 to PLC-2 Family Controller
PLC–3 Controller
1775–KA Module
PLC–2 Controller
1771–KG Module
Modem
Modem
NOTE: Modems required only for
distances greater than 50 feet.
10007-I