Rockwell Automation 1771-KA2 Communication Adapter Module - Manual (Page 123)

Start–up and Troubleshooting
Chapter 9
9-21
4. Lift the plastic lever on the module to break its backplane
connection.
5. Firmly grasp the sides of the module and pull it gently from the I/O
chassis slot.
Installing the Replacement Module
1. Set module switches to proper positions, then replace the switch
cover.
2. Insert the replacement module in the I/O chassis. Snap down the
latch on the top of the chassis and re-connect the cables to module
sockets.
Module power-up is described in section titled “Power-up.”
Station Disconnection
For most troubleshooting and startup purposes, a station can be
disconnected from the Data Highway communication link simply by
disconnecting the station dropline from the DATA HIGHWAY socket of
the module. However, should a station be disconnected for an extended
period, or should a dropline no longer be needed at any point along the
Data Highway cable, the station should be disconnected at the 1770-XG
tee connector, or the 1770-SC station connector, whichever one was used.
To disconnect a station joined by a tee connector, remove the station
dropline from the connector. Then remove the male and female truckline
cables from the tee and connect them to each other.
To disconnect a station joined by a 1770-SC connector, remove the SC’s
cover, then disconnect the wires from terminals 6 and 8. If the dropline
cable was longer than 10 ft. and the drain wire was connected to terminal
7, disconnect that one also. (See A-B PD sheet 1770-953.) Replace the
SC cover.
Figure 9.8 illustrates station connections with a 1770-SC connector and a
tee connector.