Rockwell Automation 1770-KF3 DH-485 Communication Interface User Manual - Manual (Page 10)

Installing the KF3
Chapter 2
2Ć2
Depending on your application, you can use the KF3 module to
communicate with a single station via a point-to-point link, or with
multiple DH-485 stations (for example, the SLC 500 family of
programmable controllers), via the DH-485 network.
You must construct the necessary cable or cables for each application. Use
a jacketed and shielded cable with two twisted wire pairs and a drain wire.
One pair provides a balanced signal line; one wire of the other pair serves
as a common signal reference for all nodes on the link. The shield reduces
the effect of electromagnetic noise from the industrial environment.
Belden #9842 cable is recommended.
The pinouts for the KF3’s DH-485 connector are shown in Figure 2.2.
Figure 2.2
KF3 Pinouts
ËËË
CAUTION: FOR CONTINUED
PROTECTION AGAINST RISK
OF FIRE REPLACE ONLY
WITH THE SAME TYPE
AND RATING OF FUSE.
CAUTION:
DOUBLEĆFOLD NEUTRAL
FUSES
FUSES: 0.1A 250V
TYPE 5mm X 20MM
Grounding and Terminating the Network
The precise configuration of the cable connectors is determined by their
position on the network.
Connections between intermediate nodes (nodes that are not at either
end of the network) require no jumpers. Table 2.A shows the wire and
terminal connections for a cable linking any two intermediate nodes.
DHĆ485 Cabling
Considerations