Rockwell Automation 1747-ACNR15 ControlNet Adapter Module User Manual - Manual (Page 23)

Publication 1747-UM003A-EN-P
Planning to Use Your ControlNet Adapter Module 3-3
Rack and Module Connections
There are two types of scheduled connections supported by the 1747-ACN15,
-ACNR15: the rack connection and the individual module connection.
Rack Connections
For each rack connection, RSNetWorx maps 8, 16, or 32 input and output bits
per slot.
The rack connection is used to define a single connection for the discrete
I/O in the SLC backplane. Multiple rack connections, with limitations, are
supported in the SLC adapter. For example, a connection originator might
specify an 8-bit, 16-bit, or 32-bit data size.
Operation Description
8-bit Rack
Connections Performed in a deterministic and repeatable manner. This
connection allows a memory and ControlNet bandwidth
efficient way to connect to a rack of 8-bit modules
16-bit Rack
Connections Performed in a deterministic and repeatable manner. This
connection allows a memory and ControlNet bandwidth
efficient way to connect to a rack of 16-bit modules.
32-bit Rack
Connections Performed in a deterministic and repeatable manner. This
connection allows a memory and ControlNet bandwidth
efficient way to connect to a rack of 32-bit modules.
IMPORTANT
RSNetWorx allows more than one exclusive owner rack
connection type to be configured to a 1747 adapter (e.g.
8-bit exclusive owner, 16-bit exclusive owner, and 32-bit
exclusive owner), however only one exclusive owner rack
connection can be operational at one time. It is
recommended that only one exclusive owner rack
connection type be configured to the adapter to avoid
contention between multiple connections.
IMPORTANT
If a rack connection type is changed to a smaller bit
configuration e.g. 32-bit to 16-bit, or 16-bit to 8-bit, the
unused bits for the new connection are reset to zero.