FPΣ User's Manual
3. On the FPΣ and the FP0, the same numbers are used for inputs and outputs,
e.g. X20, Y20.
4. The usable I/O numbers depend on the unit type. See "FPΣ Expansion
Units" on page 61 and "FP0 Expansion Units" on page 62.
5.1 General
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