Rockwell Automation 1770 DH,DHII,DH485 CABLE - Manual (Page 66)

Chapter 3
Constructing a Data Highway or
Data Highway Plus Cable System
3-34
Remove a Node from DH and DH+
The procedure for removing a node from a DH and DH+ network depends upon
whether you want to remove the node permanently or temporarily.
In either case, you do not need to remove power from an Allen-Bradley
programmable controller before disconnecting its node from the network. The
programmable controller continues to control its outputs in a normal fashion
even after it is disconnected from the network. Disconnection, however, may
cause the loss of some transmitted messages and the activation of
REMOTE/LOCAL FAULT indicators by the node interface module.
Temporarily Remove a Node from DH or DH+
You may want to temporarily remove a node from the network while
performing maintenance functions on the node. If the maintenance you want to
perform can be done quickly (such as inserting a new communication adapter
module at the node,) simply unplug the electrical connector from the node
interface module.
Important: A disconnected dropline may act as an antenna for signal noise.
If noise is a problem, temporarily disconnect the dropline from the trunkline.
Permanently Remove a Node From a Network Constructed with a 1770-SC
Station Connector
To permanently remove a node linked to a network by a 1770-SC station
connector, follow these steps.
1. Disconnect the dropline conductor wires from terminals 6 and 8 of the
station connector terminal block.
2. Disconnect the drain wire from terminal 7 of the station connector
terminal block.
3. Loosen the cable clamp on the dropline and pull the dropline out of the
station connector.