LINE SECTIONALIZING USING A PLC AND ABB PROTECTIVE RELAY
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NETWORK 6 – Figure 9:
This network determines if the FIFO has an entry. If the FIFO is empty Coil 00112 is energized. If the
FIFO is full Coil 00111 is energized. The FIFO can contain 19 pending commands for execution in the
TPU. As illustrated in Figure 3, the commands are numbered 1 through 10. 40142 and 40143
respectively are the data pointed to in the queue and the FIFO queue pointer.
Coil 00109 is the indicator for the program that the FIFO has an entry and the master should be halted.
Figure 9. FIFO MSTR Halt Logic
NETWORK 7- Figure 10:
This network delays the initiation of the MSTR block send instructions when a FIFO command has been
sensed in the buffer. The pointer to this command is in the 40163 pointer register. The delay is 100 mS.
As can be seen in the ladder logic, the FOUT (FIFO out stack) is popped and the parameters
corresponding to the FIFO pointer are transferred to the logic to transfer the 6X MSTR pointers from the
6X registers pointed (in FILE 1 6X memory) to the MSTR 40100 through 40109 register block.
Figure 10. Network 7 Segment 1 - FIFO Scheduling Halt Logic
Summary of Contents for REL 356
Page 23: ...ABB REL 356 Current Differential Protection 1 10 Product Overview and Specifications ...
Page 83: ...ABB REL 356 Current Differential Protection 3 36 Settings and Application ...
Page 127: ...ABB REL 356 Current Differential Protection 5 28 Testing ...
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