32
Allocating I/O Bit Numbers Section 1-5
1-5 Allocating I/O Bit Numbers
For CPU Units with 10 I/O points, the input bit addresses I0 to I5 and
output bit addresses Q0 to Q3 (Q0 to Q2 for CPU Units with
communications) 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.
Connection Example for 4-point Expansion Input Unit, 4-point
Expansion Output Unit, and 8-point Expansion I/O Unit
■ CPU Units with 10 I/O Points
Note Output bit Q3 of CPU Units with communications cannot be
output externally. It can be used as a work bit.
■ CPU Units with 20 I/O Points
Input bit
address
CPU Unit
(10 I/O points)
Expansion
I/O Unit 1
Expansion
I/O Unit 2
Expansion
I/O Unit 3
Output bit
address
I0 I1 I2 I3 I4 I5 X0 X1 X2 X3 X8 X9 Xa Xb
IN
0
IN
1
IN
2
IN
3
IN
4
IN
5
IN
0
IN
1
IN
2
IN
3
IN
0
IN
1
IN
2
IN
3
OUT
0
OUT
1
OUT
2
OUT
3
OUT
0
OUT
1
OUT
2
OUT
3
OUT
0
OUT
1
OUT
2
OUT
3
Q0 Q1 Q2 Q3 Y4 Y5 Y6 Y7 Y8 Y9 Ya Yb
X4 X5 X6 X7
IN
0
IN
1
IN
2
IN
3
OUT
0
OUT
1
OUT
2
OUT
3
Y0 Y1 Y2 Y3
(See
note.)
Expansion
I/O Unit 1
(8 I/O points)
Expansion
I/O Unit 2
(8 I/O points)
Expansion
I/O Unit 3
(4 inputs)
Input bit
address
Output bit
address
I0
I1 I2 I3 I4 I5
X0 X1 X2 X3 X4
X5 X6 X7
IN
0
IN
1
IN
2
IN
3
IN
4
IN
5
IN
0
IN
1
IN
2
IN
3
IN
0
IN
1
IN
2
IN
3
OUT
0
OUT
1
OUT
2
OUT
3
OUT
0
OUT
1
OUT
2
OUT
3
OUT
0
OUT
1
OUT
2
OUT
3
Q0 Q1Q2 Q3 Y0 Y1 Y2 Y3 Y4Y5 Y6 Y7
CPU Unit
(20 I/O points)
I6 I7 I8 I9 Ia Ib
X8
X9 Xa Xb
IN
0
IN
1
IN
2
IN
3
IN
6
IN
7
IN
8
IN
9
IN
a
IN
b
OUT
4
OUT
5
OUT
6
OUT
7
Q4 Q5Q6 Q7
OUT
0
OUT
1
OUT
2
OUT
3
Y8Y9 Ya Yb
Z211-E1-03.book Page 32 Friday, November 21, 2008 10:38 AM
To Next Page
Loading...
Need help?
General
