Rockwell Automation 1771-KA2 Communication Adapter Module - Manual (Page 33)

Module Installation
Chapter 3
3-9
The following cable connections are made to a communication adapter
module:
Data Highway cable
Program panel interconnect cable (cat. no. 1772–TC)
Data Highway/Processor cable (cat. no. 1771–CR, –CO,–CN)
At set up, all cable connections to the module can be made with power on.
After the program is up and running, however, it is safer to make
connections with power off because of the possibility of noise that
connecting will make. Also, again after the program is running, a module
should only be connected to a Data Highway with power off. A
powered–up module that is disconnected from the Data Highway will be
in the polling state and cause a highway fault if it is re–connected. This is
the same as connecting two active highway segments (which also should
not be done).
Data Highway Connection
The module connects to the Data Highway communication link by means
of a user–assembled dropline. This dropline connects to the trunkline of
the Data Highway at a 1770–SC station connector (Figure 3.6), or a
1770–XG tee connector.
Cable Connections