Rockwell Automation 1771-ASB/E Remote I/O Adapter User Manual - Manual (Page 41)

3–11 Addressing Modes for Your Remote I/O
Publication 1771-UM001A-US-P - February 2000
Module Placement with 2Ćslot Addressing
Figure 3.9 shows possible module placement when configuring
complementary I/O with 2-slot addressing.
Figure 3.9
ComplementaryI/O Configurations 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
Follow these guidelines when you select 2-slot addressing:
•
Place an 8-point output module opposite a 16-point input module.
•
An I/O group having a 16-point input and output module cannot
have a corresponding I/O group in the complementary chassis.
•
You can place an output module opposite another output module;
they reflect the same bits in the output image table.
You can use block-transfer modules in a complementary I/O system,
with these restrictions: