Rockwell Automation 1794-ASB/E Remote I/O Adapter Module User Manual - Manual (Page 42)

3–8 Communicating with FLEX I/O Modules
Publication 1794ĆUM009D-EN-P - April 2004
Use compact addressing when:
•
you are not using combination modules
•
you are using only digital input, digital output and analog
modules
•
you don’t need all the features of digital FLEX I/O modules (You
can only access the input word on an input module, or the output
word of an output module. Any status information/configuration
information in the corresponding input/output word is not
accessible.)
•
you can locate equal numbers of input and output modules in a
single chassis
•
you want more efficient use of the input/output data table
Compact Mode
Compact mode maximizes single chassis I/O image table usage when
using either 8- or 16-point modules and block transfer modules.
Compact mode allows more than 1 module to occupy a single I/O
group. How many modules depends on the density selected (16- or
8-point).
In compact mode, with 16-point density, 2 digital modules (1 input
and 1 output module) can occupy 1 I/O group. In addition, 2 block
transfer modules can occupy 1 I/O group. If higher density modules
are used, only the lowest 16 bits will be available.
In compact mode, with 8-point density, 4 digital modules (2 input
and 2 output modules) mounted in module pairs can occupy 1 I/O
group. In addition, 2 block transfer modules can occupy 1 I/O group.
If higher density modules are used, only the lowest 8 bits will be
available.
Compact Addressing