Rockwell Automation 1794-ASB/E Remote I/O Adapter Module User Manual - Manual (Page 26)

2–8 Installing Your Remote I/O Adapter Module
Publication 1794ĆUM009D-EN-P - April 2004
The remote I/O adapter module has two 8-position switch assemblies
which you set for:
•
starting I/O group
•
I/O logical rack number
•
hold inputs
•
addressing modes
•
last chassis
•
communication rate
•
processor restart lockout (PRL)
•
hold last state (outputs)
WARNING
!
The switch settings on the series E adapter are not
the same as on the series A, B, C or D adapter. If
you are replacing an earlier series adapter with
this series E adapter, make certain that the
switches are set correctly for your application.
Starting I/O Group
An I/O group is an addressing unit that can contain up to 16 input
terminals and 16 output terminals. The starting I/O group is the
first group of input and output circuits that correspond to one word in
both the input and output image tables. These starting I/O groups are
numbered 0, 2, 4 and 6. The number of modules that make up an I/O
group varies with the mode of addressing.
I/O Rack Number
One logical I/O rack is 8 I/O groups. You cannot have more than 2
logical racks per adapter. Refer to “Determining Rack Size” on page
3–16 for examples.
Hold Inputs
When hold inputs is enabled (S2-7 on), the adapter will retain the
last memory image present when you remove a discrete input
module from its base. These inputs are held until the correct module
is placed back in the base. If the same type of module is reinserted
into the base, its inputs will be transferred. If a different type of
module is inserted in the base, its memory image will go to zero.
Any associated outputs will also go to zero.
Chapter
Setting the Switches