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LINE SECTIONALIZING USING A PLC AND ABB PROTECTIVE RELAY
pointers for obtaining the 6X register data for passing to the appropriate 4X XMIT parameterization
registers. Figure 37 illustrates the logic to accomplish this task.
Figure 37. Segment 3 Network 8 – Cyclic Poll Cessation Logic
Segment 3 Network 9:
As illustrated, this is essentially a copy of Segment 3 Network 3 logic. It is copied here in order to keep
the same philosophy for instruction parameter loading whether it is from a cyclic poll request or a FIFO
task interruption. The logic is shown in Figure 38.
Figure 38. Segment 3 Network 9 – XMIT Pointer Computation Logic
Segment 3 Network10:
This network determines that the FIFO is empty and cyclic polling using the logic in Segment 3 Network 2
resumes. The Logic is illustrated in Figure 39.
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