Glossary
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Unit In OMRON PC terminology, the word Unit is capitalized to indicate any prod-
uct sold for a PC System. though most of the names of these products end
with the word Unit, not all do, e.g., a Remote Terminal is referred to in a col-
lective sense as a Unit. Context generally makes any limitations of this word
clear.
watchdog timer A special timer inside the CPU that monitors the PC’s cycle time. The watch-
dog timer sets a flag if the cycle time becomes longer than a certain specified
value. This is useful if the correct operation of your System depends on a
certain maximum cycle time.
word In digital circuits, a group of bits. Usually a word consists of four, eight, or
sixteen bits. In C-series PCs, a word consists of sixteen bits. Words can be
used to store data, or they can be used for I/O.
work bits Bits in the IR area that are not being used for input or output. These bits can
be used in the program in any way desired.
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