16.7 SUMMARY

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Shift registers move bits through a queue.

Stacks will create a variable length list of words.

Sequencers allow a list of words to be stepped through.

Parts of programs can be skipped with jump and MCR statements, but MCR statements shut off outputs.

Subroutines can be called in other program files, and arguments can be passed.

For-next loops allow parts of the ladder logic to be repeated.

Interrupts allow parts to run automatically at fixed times, or when some event happens.

Immediate inputs and outputs update I/O without waiting for the normal scans.