Rockwell Automation 1771-ASB/E Remote I/O Adapter User Manual - Manual (Page 47)

3–17 Addressing Modes for Your Remote I/O
Publication 1771-UM001A-US-P - February 2000
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When using double-slot block-transfer modules:
– The left slot of the two corresponding I/O groups must be
empty.
– You can place any single-slot I/O module in the right slot
of the two corresponding I/O groups.
When using single-slot block-transfer modules, the corresponding
I/O group must be empty.
The following rules apply when you assign I/O rack numbers:
When you select 1-slot addressing, set switches of switch assembly
S1 to assign the first I/O rack number of the chassis. The remote I/O
adapter module automatically assigns the next higher I/O rack
number to the remaining I/O groups of the chassis.
For example, if you want a 16-slot chassis that you set for 1-slot
addressing to begin with I/O rack number 0, set switches of switch
assembly S1 for I/O rack number 0. The adapter module
automatically assigns I/O rack number 1 to the remaining I/O groups
of the chassis (Figure 3.15).
Figure 3.15
Assigning I/O Rack Numbers with 1Ćslot Addressing
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Set switches of switch assembly S1
on the remote I/O adapter module
for I/O rack number 0. The adapter
automatically assigns I/O rack numĆ
ber 1 to the remaining I/O group of
the chassis.
1771ĆA4B I/O Chassis using 1Ćslot addressing
I/O Group
Number
Assigned I/O Rack
Number 0
Assigned I/O Rack
Number 1
0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7
You assign one I/O rack number to eight I/O groups, regardless of
which addressing method you select.
Assigning I/O Rack
Numbers with 1ĆSlot
Addressing