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2.3
I/O Number Assignment
The I/O number indicates addresses used for sequence programs in the following cases.
• Input of on/off data to the CPU module
• Output of on/off data from the CPU module to the external device
(1) Input and output of on/off data
The input (X) is used to input on/off data to the CPU module, and the output (Y) is used to output on/off data from
the CPU module.
(2) I/O number representation
The I/O numbers are represented in hexadecimal. When a 16-point I/O module is used, the I/O number for each
slot will be 16 point-sequence number from 0 to F as shown in the following figure. "X" and "Y" is
prefixed to the I/O number of input modules and the I/O number of output modules, respectively.
Power supply module
CHAPTER 2 APPLICATION OF PROGRAMMING
For the case of input
module
X
0
0
0
X
0
1
0
X
0
2
0
X
0
0
F
X
0
1
F
X
0
2
F
16 input
16 input
16 input
points
points
points
CPU module
For the case of
output module
Y
0
3
0
Y
0
4
0
Y
0
3
F
Y
0
4
F
16 output
16 output
points
points
2
55
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