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Appendix A Glossary
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This Appendix is a Glossary of Terms for the Hand-Held Programmer and the Series
90-30, Series 90-20, and Series 90 Micro PLCs.
Glossary of Terms for the Series 90-30/20/Micro PLCs
Address
A number following a reference type which together refer to a specific user reference,
that is, for %Innnn; %I is the reference type and nnnn is the address.
Alarm Processor
A software function that time-stamps and logs I/O and system faults in two tables that
can be displayed by the programmer or uploaded to a host computer or other
coprocessor.
Analog
An electrical signal activated by physical variables representing force, pressure,
temperature, flow, etc.
AND (Logical)
A mathematical operation between bits. All bits must be 1 for the result to be 1.
Application Program
The program written by the user for control of a machine or process, that is the
application.
ASCII
American Standard Code for Information Interchange. An eight-bit (7 bits plus 1 parity
bit) code used for data.
Backplane
A group of connectors physically mounted on a board at the back of a rack into which
modules are inserted. The connectors are wired together by a printed circuit board.
GFK-0402G
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