I/O AllocationFP2/FP2SH3 − 153.4 Automatic Allocation3.4 Automatic Allocation3.4.1 Using Automatic AllocationAfter turning on the power, I/O numbers are determined by the I/O unit installation posi-tions and assigned in order beginning from the left side of the CPU backplane.If an expansion backplane has been added on the FP2 backplane, the number of slotsfor I/O units on the CPU backplane is taken as 16 slots. (The FP2 backplane H typeoccupies 8 slots only.)For a slot with no unit mounted, an equivalent of 16 points (16E) is allocated.In the case of automatic allocation, I/O numbers are assigned based on the installedI/O units each time the power is turned on.NoteWith automatic allocation, the contents of allocation are not reg-istered to the system register.3.4.1.1 Example of Automatic AllocationThe I/O numbers in the illustration are the allocated I/O numbers using automatic alloca-tion.CPU backplaneBackplane: 7-module typePower supply unit: 1 moduleCPU: 1 moduleI/O units:16-point type DC input unit: 2 units16-point type transistor output unit: 3 unitsExpansion backplaneBackplane: 9-module typePower supply unit: 1 moduleI/O units:16-point type relay output unit: 6 units64-point type DC input unit: 1 unitCPUbackplaneExpansionbackplaneSlot No.Slots that do not actually existX0toXFY40toY4FY30toY3FY20toY2FX10toX1FY180toY18FY170toY17FY160toY16FY210toY21FY200toY20FY190toY19FX220toX25F50to5F60to6F150to15F260to26F16-point typeDC input unit16-point typetransistor output unitFreeslot64-pointtype DCinput unit16-point typerelay output unit
