Allocating I/O Bit Numbers - Omron ZEN Operation Manual

Allocating I/O Bit Numbers

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Allocating I/O Bit Numbers

Connection Example for 4-point Expansion Input Unit, 4-point
Expansion Output Unit, and 8-point Expansion I/O Unit
Input bit
I0 I1 I2 I3 I4 I5
address
IN
0
OUT
Output bit
address
Input bit
I0 I1 I2 I3 I4 I5
address
IN IN IN
0 1 2
OUT OUT OUT
0 1
Output bit
Q0 Q1Q2 Q3
address
Note
For CPU Units with 10 I/O points, the input bit addresses I0 to I5 and
output bit addresses Q0 to Q3 are always allocated to the CPU Unit.
For CPU Units with 20 I/O points, the input bit addresses I0 to Ib and
output bit addresses Q0 to Q7 are always allocated to the CPU Unit.
Up to 3 Expansion I/O Units can be added and input bit addresses X0
to Xb and output bit addresses Y0 to Yb are allocated in the order the
Units are connected.
CPU Units with 10 I/O Points
IN IN IN IN IN
1 2 3 4 5
CPU Unit
(10 I/O points)
OUT OUT OUT
0 1 2 3
Q0 Q1 Q2 Q3
CPU Units with 20 I/O Points
I6 I7 I8 I9 Ia Ib
IN IN IN IN IN IN IN
3 4 5 6 7 8 9
CPU Unit
(20 I/O points)
OUT OUT OUT OUT OUT
2 3 4 5 6 7
Q4 Q5Q6 Q7
When an Expansion I/O Unit that does not have both inputs and
outputs, such as the 4-point Input Unit and the 4-point Output
Unit shown in the above diagram, the unused bit addresses are
not allocated to that Unit and are used for the next Unit.
X0 X1 X2 X3
IN IN IN IN
Expansion
0 1 2 3
I/O Unit 2
Expansion
(4 outputs)
I/O Unit 1
(4 inputs)
OUT
0
Y0 Y1 Y2 Y3
X0 X1 X2 X3 X4 X5 X6 X7
IN IN IN IN IN IN
a b 0 1 2 3
Expansion
I/O Unit 1
(8 I/O points)
OUT OUT OUT OUT
0 1 2 3
Y0 Y1 Y2 Y3 Y4Y5 Y6 Y7
Section 1-5
X4 X5 X6 X7
IN IN
0 1
Expansion
I/O Unit 3
(8 I/O points)
OUT OUT OUT OUT OUT
1 2 3 0 1
Y4 Y5 Y6 Y7
X8 X9 Xa Xb
IN IN IN IN IN IN
0 1 2 3 0 1
Expansion
Expansion
I/O Unit 2 I/O Unit 3
(8 I/O points)
(4 inputs)
OUT OUT OUT OUT
0 1 2 3
IN IN
2 3
OUT OUT
2 3
IN IN
2 3
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