Rockwell Automation Logix5000 Controllers I/O and Tag Data Programming Manual - Manual (Page 18)

Chapter 1 Communicate with I/O modules
I/O information is presented as a set of tags.
• Each tag uses a structure of data. The structure depends on the specific
features of the I/O module.
• The name of the tag is based on the location of the I/O module in the
system.
• When you add a module to the I/O Configuration folder, the software
automatically creates controller-scoped tags for the module in Controller
Tags.
An I/O address uses this format:
Where Is
Location Network location
LOCAL = same chassis or DIN rail as the controller
ADAPTER_NAME = identifies remote communication adapter or bridge module
Slot Slot number of I/O module in its chassis or DIN rail
Type Type of data
I = input
O = output
C = configuration
S = status
Member Specific data from the I/O module; depends on what type of data the module can store.
• For a digital module, a Data member usually stores the input or output bit values.
• For an analog module, a Channel member (CH#) usually stores the data for a channel.
Address I/O data
18 Rockwell Automation Publication 1756-PM004E-EN-P - October 2014