Rockwell Automation 1771-ASB/E Remote I/O Adapter User Manual - Manual (Page 52)

3–22 Addressing Modes for Your Remote I/O
Publication 1771-UM001A-US-P - February 2000
Some processors support a complementary I/O configuration. Refer
to the user’s 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.
Module Placement with 1/2Ćslot Addressing
Figure 3.19 shows possible module placement for a complementary
I/O configuration with 1/2-slot addressing.
Figure 3.19
Complementary I/O Configuration with 1/2Ćslot Addressing
I I O I O O O
Double-slot
BT
E
M
P
T
Y
E x a m p le A
E x a m p le B
P rim a ry 1 2 -s lo t
C h a s s is
I/O G ro u p
N u m b e r
C o m p le m e n ta ry
1 2 -s lo t C h a s s is
P rim a ry 1 2 -s lo t
C h a s s is
I/O G ro u p
N u m b e r
C o m p le m e n ta ry
1 2 -s lo t C h a s s is
I = Input M odule
O = O utput M odule
BT = Block transfer M odule
1 O utput m odules use the sam e output im age table bits
2 Can be input or output m odule (8- or 16-point) single-slot block tran fer m odule
3 M ust be em pty if corresponding prim ary slot is block transfer m odule
1 2
BT O I
E
M
P
T
Y
O O I I O O I
I, O ,
BT
I O
I
O
I
O
I
O
I
O
I
O
I
O
I
O
I
O
I
O
I
O
I
O
I
O
14261
1
0 1
0 1 2 3
2 3
4 5
4 5
6 7
6 7
0 1
0 1
2 3
2 3
4 5
4 5
6 7
6 7
0 1
0 1
2 3
2 3
4 5
4 5
6 7
6 7
3 3
s
Complementary I/O with
1/2ĆSlot Addressing