Rockwell Automation 1738 Assembly Connections for POINT I/O and ArmorPOINT I/O EtherNet/IP Adapters - Manual (Page 7)

1 Publication 1734-UM016A-EN-P - October 2010
Chapter
1
Introduction
About Assembly
Connections This document describes Assembly connections, a new connection type for
POINT I/O and ArmorPOINT I/O EtherNet/IP adapters. These adapters
currently support Rack Optimized connections between ControlLogix or
CompactLogix controllers and the discrete I/O modules in the chassis.
They are also capable of bridging direct connections between any
EtherNet/IP-capable connection originator and the I/O modules, via
the backplane. This new functionality being presented will permit the exchange
of data between an originator and all POINT I/O modules present in the
chassis in one connection.
This new Assembly connection is mutually exclusive to other connection
types, for example, Rack Optimized or Direct to module connections. In other
words, if this connection is in use by one connection originator, other
originators are prevented from making Rack Optimized or Direct Connections
to the modules in the same chassis. Furthermore, the connection is
all-inclusive; every module present in the backplane participates in the
connection.
The I/O data that is exchanged with the adapter takes the following form:
The 64-bit Status header is optional and the packing of the data is dependant
on the selected alignment choice. The exact method for determining the data
structure is covered in the following sections.
Choose a Connection The Assembly connection supports an optional 64-bit status header and also
supports requests from listen-only originators.
Adapter Data Exchange
T
→
O produced I/O data O
→
T consumed I/O data
64-bit Status header Run/Idle header
Slot 1 data Slot 1 data
Slot 2 data Slot 2 data
: :
: :
Slot N
(1)
data
(1) N is the number of I/O modules
Slot N data