Summary For Placing Modules Used In Complementary I/O; Discrete Modules; Block Transfer Modules - Allen-Bradley 1747-SN User Manual

Summary for Placing Modules Used In Complementary I/O

Discrete Modules

Addressing Method
2 slot 8 point
1 slot 8 point, 16 point
1/2 slot 8 point, 16 point, 32 point
If an input module resides in either slot, associated with a logical group, of the primary chassis, an
input module cannot reside in that logical group's complementary chassis.

Block Transfer Modules

Addressing Method
2 slot
1 slot
1/2 slot
The following example illustrates how I/O modules requiring two
words of the input or output image can leave unused image space.
Overview
Types of Modules used
Install input modules
opposite output modules,
and output modules
opposite input modules.
Placement
The right slot of the primary I/O group can be another block
transfer module, or an 8 point input or output module.
The left slot of the complementary I/O group must be
empty.
In the right slot of the complementary I/O group, you can
place an 8 point output module; this slot must be empty if
the corresponding slot in the primary I/O group is a block
transfer module.
Leave the corresponding I/O group in the complementary
chassis empty.
Leave the corresponding I/O group in the complementary
chassis empty.
Publication 1747 6.6 - July 1996
1–15
Placement