1756 ControlLogix Communication Modules Specifications Standard
ControlLogix Catalog Numbers: 1756-CN2, 1756-CN2R, 1756-CNB,
1756-CNBR, 1756-DNB, 1756-DHRIO, 1756-DH485, 1756-EN2F, 1756-EN2T,
1756-EN2TP, 1756-EN2TR, 1756-EN3TR, 1756-EN4TR, 1756-ENBT,
1756-EWEB, 1756-RIO, 1756-SYNCH, 1756-TIME ControlLogix 1756
Communication Module Conformal Coated Catalog Numbers: 1756-CN2RK,
1756-EN2FK, 1756- EN2TK, 1756-EN2TPK, 1756-EN2TRK, 1756-EN4TRK,
1756-ENBTK, 1756-TIMEK ControlLogix Extended Environment Module
Catalog Numbers: 1756-CN2RXT, 1756-DHRIOXT, 1756-EN2TPXT, 1756-
EN2TXT, 1756-EN2TRXT, 1756-EN4TRXT
Communication Connections A ControlLogix system uses connections to
establish communication links between devices. The types of
connections include the following: • Controller-to-local I/O
modules or local communication modules • Controller-to-remote I/O
or remote communication modules • Controller-to-remote I/O
(rack-optimized) modules • Produced and consumed tags • Messages •
Controller access with the Studio 5000™ environment • Controller
access with RSLinx® software for HMI or other applications You
indirectly determine the number of connections the controller uses
by configuring the controller to communicate with other devices in
the system. The limit of connections ultimately resides in the
communication module you use for the connection. If a message path
routes through a communication module, the connection that is
related to the message also counts towards the connection limit of
that communication module.
EtherNet/IP Network
The Ethernet Industrial (EtherNet/IP) network protocol is an open
industrial-networking standard that supports both real-time I/O
messaging and message exchange. The EtherNet/IP network uses
off-the-shelf Ethernet communication chips and physical media
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