Rockwell Automation 1770-KF3 DH-485 Communication Interface User Manual - Manual (Page 12)

Installing the KF3
Chapter 2
2Ć4
Connecting via a DHĆ485 Link (PointĆtoĆPoint Configuration)
Figure 2.4 shows a point-to-point link consisting of a single SLC 500
programmable controller and one host computer station.
Figure 2.4
A PointĆtoĆPoint DHĆ485 Link
DHĆ485 Cable
Belden #9842
RSĆ232C
Cable
Host Computer KF3
1747ĆC11 Cable
SLC 500
Controller
Link
Coupler
1747ĆAIC
This configuration requires a KF3 and one link coupler. The SLC 500
controller is connected to the link coupler with a 1747-C11 cable. The
KF3 is connected directly to the link coupler. In this topology, both the
KF3 and the SLC 500 are end nodes.
Construct a cable to attach the DH-485 connector on the back of the
KF3 module to the link coupler. Figure 2.5 shows the connection for a
point-to-point DH-485 application. The shield ground could be at either
end, but must be at one end, and one end only.
Figure 2.5
Connection for KF3 and Single SLC
Jumper to ground
shield connector
KF3 on one end of the link
Jumper to
terminate node
SLC 500 or other device at the other end of the link
Jumper to
terminate node
* The black wire of the white/black pair should be cut back (no connection).