4-2
4.1 I/O Allocation
Regarding I/O number
• Specifying X and Y numbers
On the FPΣ and the FP0, the same numbers are used for input and output.
• Expression of numbers for input/output relays
Since input relay “X” and output relay “Y” are handled in units of 16 points, they are expressed as a
combination of decimal and hexadecimal numbers as shown below.
• Slot No.
Slot No. is the number indicating the installing position of the expansion unit which is used to generate
programs by some FPΣ expansion unit.
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