Module
Network
Node
output
Preset
Processor
Reference Number
Register
Remote Preset
Run Light
Scan
Solid-State
Timer
An input/output device that passes signals between the “real world” and
the controller. Modules used with the MICRO 84 can be either input or
output, discrete or register. Modules are designed to be easily replaced
with minimum system downtime.
A group of connected logic elements used to perform a special function.
A network can be from one element to a complete 4 x 7 matrix of elements.
A point on a ladder diagram in which a logic element can be placed. A node
can receive power from the left, top, or bottom and can pass power to the
right, top, or bottom.
A signal provided from the Controller to the “real world” that can be either
discrete output (solenoid valve, relay, motor starter, indicator lamp, etc.),
or numeric output (e.g., LED display).
The limit established for a counter or timer function. The current count or
time available from the register referred to in the lower element cannot
exceed this limit. At the preset value, the logic output is energized
The “brain” of the Controller system, wherein the user’s logic and PC’s
executive is stored; all logic solving and decision making is performed by
the Processor. Also called the CPU or mainframe.
Four-digit numbers used in the construction of the user’s logic. Reference
numbers can be either for discrete devices (logic coils, inputs, or
sequencer steps) or for registers (input or holding).
A location within the Controller allocated to the storage of numeric values
(up to 999). All holding registers are retentive on power failure. There are
three types of registers: input registers whose contents are controlled by
the “real world” outside the Controller; holding registers whose contents
are controlled from within the Controller; and output registers, which are
special holding registers since their contents can also be provided to the
“real world”.
The capability for placing the preset for a timer or counter into a register
and referring to that register in the upper element of the logic. The preset
is no longer fixed since the contents of the register (and thus the preset)
can be altered at any time.
An LED indicator on the Processor that indicates, when lit, that the logic
is being processed.
The technique of examining or solving logic networks one at a time in their
numeric order. After the last network is solved, the next scan begins at
network one; logic is always solved in this fixed cyclic process.
Circuitry designed using only integrated circuits, transistor, diodes, etc.;
no electro-mechanical devices such as relays are utilized. High reliability
is obtained with solid-state logic, which would be degraded by depending
upon electro-mechanical devices.
A logic element used to measure and record the time of an event or
sequence of events. Timers can accumulate time in either seconds, or
tenths of seconds.
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