4
I/O NUMBER ASSIGNMENT
4.5 Definition of I/O Number
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4.5 Definition of I/O Number
I/O numbers indicate the addresses used in a sequence program to input or output ON/
OFF data between the CPU module and other modules.
(1) Input and output of ON/OFF data
Input (X) is used to input ON/OFF data to the CPU module, and output (Y) is used to
output ON/OFF data from the CPU module.
(2) I/O number expressions
I/O numbers are expressed as hexadecimal.
When using 16-point I/O modules, I/O numbers are consecutively assigned to the
slots having
0 to
F, 16 points, as shown in Figure 4.16.
The module mounted in the base unit assigns the following:
• For the input module, "X" is assigned at the beginning of the I/O number.
• For the output module, "Y" is assigned at the beginning of the I/O number.
Figure 4.16 Input and output numbers
CPU module
Power supply
For the case of input
module
For the case of
output module
16 input
points
16 input
points
16 input
points
16 output
points
16 output
points
X
X
X
Y
Y
X
X
X
Y
Y
0
1
2
3
4
1
2
3
4
F
0
0
F
0
F
0
F
0
F
0
0
0
0
0
0
0
0
0
0
0
