
3–9Addressing Modes for Your Remote I/O
2!*(" 1(-, $!/2 /5
Some processors support a complementary I/O configuration. Refer
to the user manual for your processor to see if it supports this type of
configuration.
You configure complementary I/O by duplicating an I/O rack
number of one I/O chassis (primary) in another I/O chassis
(complementary), I/O group for I/O group. The I/O modules in the
complementary chassis perform the opposite function of the
corresponding modules in the primary chassis.
With 2-slot addressing you install, as a pair, the same type of 8-point
I/O module in an I/O group of the primary chassis. You install, as a
pair, the opposite type of 8-point I/O module in the corresponding
I/O group of the complimentary chassis.
For example, with an I/O chassis set for 2-slot addressing, place two
8-point input modules in I/O group 0 of the primary chassis. In I/O
group 0 of the complementary chassis, place two 8-point output
modules (Figure 3.8). Use the same type of 8-point I/O modules in
both slots of a single I/O group.
Figure 3.8
Example of Complementary I/O Configuration with 2Ćslot
Addressing
-2!*$0*-1
-2!*$0*-1
4 +.*$
4 +.*$
/(+ /5 0*-1
' 00(0
/-2.
2+!$/
-+.*$+$,1 /5
0*-1 ' 00(0
/(+ /5 0*-1
' 00(0
/-2.
2+!$/
-+.*$+$,1 /5
' 00(0 -1
**-3 $#
4"$.1 %-/ 21.21
,.21 -#2*$
21.21 -#2*$
*-") 1/ ,0%$/ -#2*$
21.21 +-#2*$0 20$ 1'$ 0 +$ -21.21 (+ &$ 1 !*$ !(10
, !$ .-(,1 (,.21 -/ -21.21 +-#2*$ -/ 0(,&*$0*-1 !*-") 1/ ,0%$/ +-#2*$
201 !$ $+.15 (% "-//$0.-,#(,& ./(+ /5 0*-1 (0 !*-") 1/ ,0%$/ +-#2*$
21.210 (, 1'$ "-+.*$+$,1 /5 "' 00(0 20$ 1'$ 0 +$ !(10 (, 1'$ -21.21 (+ &$ 1 !*$ 0
1'$ -21.210 (, 1'$ ./(+ /5 "' 00(0
Complementary I/O with
2ĆSlot Addressing
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