FP2/FP2SHI/O Allocation
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3.6 I/O Numbers of Free Slots
3.6 I/O Numbers of Free Slots
3.6.1 I/O Numbers of Free Slots
I/O numbers are also assigned to modules (slots) where no units are installed. Program-
ming and system construction can be made more efficient by using an appropriate
manner of assigning I/O numbers.
3.6.2 Differences Due to Allocation Methods
The manner of assigning I/O numbers differs depending on the I/O allocation method.
3.6.2.1 When Arbitrary Allocation is Used
I/O point numbers can assigned as desired.
Advantage
When designing a system with the intention of adding units in the future, you can use
arbitrary allocation to assign ahead of time the I/O point numbers of the units to be add-
ed.
If no assignment is made, 0 is assigned.
By using I/O number assignments that take into account future expansion when creat-
ing the program, no discrepancies will occur when the new units are added on. Planning
ahead for expansion improves efficiency.
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