Complementary i/o with 2-slot addressing, Complementaryi/o with 2ćslot addressing – Rockwell Automation 1771-ASB/E Remote I/O Adapter User Manual User Manual
Page 39
3–9
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 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 ComplementaryI/O Configuration with 2Ćslot
Addressing
I
O
I
O
O
I
BT
BT
BT
Double-slot
BT
Double-slot
BT
E
M
P
T
Y
E
M
P
T
Y
E
M
P
T
Y
E
M
P
T
Y
E
M
P
T
Y
E
M
P
T
Y
E
M
P
T
Y
0
2
1
3
4
5
6
7
O
0
2
1
3
4
5
6
7
E x a m p le A
E x a m p le B
P rim a ry 1 6 -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 6 -s lo t C h a s s is
P rim a ry 1 6 -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
C h a s s is N o t
A llo w e d
E x c e p t fo r O u tp u t
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 C an be 8-point input or output m odule or single-slot block transfer m odule
3 M ust be em pty if corresponding prim ary slot is block transfer m odule
2
1
3
13079
O u tp u ts in th e c o m p le m e n ta ry c h a s s is u s e th e s a m e b its in th e o u tp u t im a g e ta b le a s
th e o u tp u ts in th e p rim a ry c h a s s is .
3
3
3
3
3
8
I
8
8
O
8
16
16
O
8
O
8
8
8
O
8
O
8
O
8
I
8
I
8
O
8
O
8
O
8
O
8
O
8
I
16
16
I
16
O
16
I
16
I
16
I
16
I
16
I
16
I
16
O
16
O
16
O
16
O
16
O
16
O
16
ComplementaryI/O with
2ĆSlot Addressing