APPENDIX C
GLOSSARY OF TERMS
Arithmetic
Binary
Binary Coded
Decimal (BCD)
Bit
Coil
Counter
Disable
Discrete
Dump
Element (Logic)
Force
Input
110
Latch
Logic Element
Memory Protect
A type of logic used to add or subtract two numeric values. The status of
the two outputs is governed by the result of the arithmetic computation
(addition overflow or subtraction comparisons).
A number system in which all values can be expressed by 1 or 0. In
electronic hardware, the value 1 is the ON state of a circuit while 0 is the
OFF state. Calculations can be made at a very high rate of speed using the
binary number system and solid-state electronic hardware.
A number system where 4 binary (l/O or ON/OFF) characters (or lines)
represent a decimal digit (O-9). BCD is a recognized industry standard. BCD
input devices (e.g., thumbwheels) and output devices (e.g., numeric
displays) are readily available.
A single binary character.
A discrete output from the programmable controller. The output is normally
used to energize a solenoid (provide power flow to the solenoid coil). Coils
are turned OFF when power is removed (see Latch).
A type of logic used to count the occurrence of a particular event (a contact
closing, a coil energized, etc.).
The capability of disconnecting a logic coil or a discrete input from control
by program logic. In the disabled state, the logic element can be turned on
and off using the program panel. This allows a system to be checked out
element by element.
Logic elements that can be either ON or OFF. Discrete elements can be
input, output, or internal logic elements.
Recording the entire contents of user memory onto the Program Pack.
The basic building block of the MICRO 84 logic. An element is a contact,
coil, connector, timer, counter or arithmetic function.
A function on the P370 Programming Panel that can change the state of a
disabled logic element from OFF to ON or vice-versa.
A signal that provides information to the MICRO-84 controller. The input
signal can be from a discrete device (pushbutton, relay contacts, limit
switches, etc.) or from a numeric device such as a thumbwheel.
The communication between the MICRO 84 and the “real world” is called
l/O (input/output). The l/O signals can be either discrete (ON or OFF) or
numeric (register contents).
A coil that retains its state (ON or OFF) when power is removed and whose
state is not reset when power is again available.
Any one of the elements that can be used in a ladder logic diagram. The
elements include contacts, coils, shunts, timers, counters, and arithmetic
functions.
The capability of preventing unauthorized use of a P370 Programming
Panel to make changes to the MICRO 84 Programmable Controller. When
the key is in the OFF position or removed, user logic in the controller
cannot be changed from the P370.
C-l
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