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computer programming codes that
give a PLC the ability to perform mathematical functions on data.
Arithmetic instructions –

a PLC programming language, based
primarily on the Boolean logic operators, that implements all of the functions
of the basic ladder diagram instruction set.
Boolean language –

a ladder diagram symbol that represents and output
instruction.
Coil –

a ladder diagram symbol that represents an input
condition.
Contact –

computer programming codes that allow
a PLC to perform accounting functions of a hardware counter.
Counter instructions –

computer codes that provide
a PLC with the ability to compare, convert, shift, examine, and operate on data
in multiple registers.
Data manipulation instructions –

computer codes that allow a PLC
to move numerical data within the controller, either in single register units
or in blocks of registers.
Data transfer instructions –

arithmetic instructions that
use double the number of registers than singleprecision arithmetic to hold the
operands and result.
Doubleprecision arithmetic –

a PLC language that implements
basic ladder language instructions, as well as more sophisticated functional
block instructions, which can perform multiple operations in a single
instruction.
Enhanced ladder language –

a PLC programming language that uses an
objectoriented, flowchartlike framework, along with steps, transitions, and
actions, to define the control program.
Grafcet –

a graphical set of instructions that
implements basic ladder relay functions in a PLC.
Ladder language –

computer codes that implement
relay coils and contacts and their corresponding functions in a PLC.
Ladder relay instructions –

a rectangular array that defines the
maximum number of contacts that can be programmed in a ladder rung, along with
the maximum number of parallel branches allowed in the rung.
Ladder rung matrix –

computer codes that
allow a PLC to share data with other PLCs connected to a local area network.
Network communications instructions –

computer codes that give
a PLC the ability to direct the flow of operation and alter the order of
execution of a control program.
Program/flow control instructions –

arithmetic instructions that
use one register each to hold the operands and one or two registers to hold the
result of the operation.
Singleprecision arithmetic –

computer codes that allow a
PLC to perform special operations, such as sequencing, diagnostics, and PID
control.
Special function instructions –

computer codes that allow a PLC to
perform the timing functions of a hardware timer.
Timer instructions –

