Rockwell Automation 1771-ASB/E Remote I/O Adapter User Manual - Manual (Page 42)

3–12 Addressing Modes for Your Remote I/O
Publication 1771-UM001A-US-P - February 2000
•
When using double-slot block-transfer modules:
•
The left slot of the complementary I/O group must be empty.
•
You can only place an 8-point output module (if any) in the
right slot of the complementary I/O group.
•
When using single-slot block-transfer modules:
•
The right slot of the primary I/O group can be another
single-slot block-transfer module, or an 8-point input or output
module.
•
The left slot of the complementary I/O group must be empty.
•
You can place an 8-point output module in the right slot of the
complementary I/O group; this slot must be empty if the
corresponding slot in the primary I/O group is a single-slot
block-transfer module.
When you select 2-slot addressing, each pair of slots (one I/O group)
is assigned to the corresponding pair of words in the input and
output image tables. You assign one I/O rack number to eight I/O
groups (Figure 3.10).
Figure 3.10
I/O Image Table and Corresponding Hardware for One
Assigned Rack Number with 2Ćslot Addressing
I O I O I O I O I O I O I O I O
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
0 1 2 3 4 5 6 7
W o rd #
W o rd #
O u tp u t Im a g e T a b le
In p u t Im a g e T a b le
14966
NOTE: Modules can also be
installedlike this: I O O I
I/O Group Designation
Input/Output Designation
An I/O chassis containing 16Ćpoint modules
0 1 2 3 4 5 6 7