Omron SYSMAC C20P Operation Manual page 201

jump number
ladder diagram (program)
ladder diagram symbol
ladder instruction
leftmost (bit/word)
link
load
logic block
logic block instruction
LR area
Master
main program
memory area
mnemonic code
MONITOR mode
NC input
Glossary
A definer used with a jump that defines the points from which and to which a
jump is to be made.
A form of program arising out of relay-based control systems that uses cir-
cuit-type diagrams to represent the logic flow of programming instructions.
The appearance of the program suggests a ladder, and thus the name.
A symbol used in a ladder-diagram program.
An instruction that represents the 'rung' portion of a ladder-diagram program.
The other instructions in a ladder diagram fall along the right side of the dia-
gram and are called terminal instructions.
The highest numbered bits of a group of bits, generally of an entire word, or
the highest numbered words of a group of words. These bits/words are often
called most significant bits/words.
A hardware or software connection formed between two Units. "Link" can
refer either to a part of the physical connection between two Units or a soft-
ware connection created to data existing at another location (I/O Links).
The processes of copying data either from an external device or from a stor-
age area to an active portion of the system such as a display buffer. Also, an
output device connected to the PC is called a load.
A group of instructions that is logically related in a ladder-diagram program
and that requires logic block instructions to relate it to other instructions or
logic blocks.
An instruction used to locally combine the execution condition resulting from
a logic block with a current execution condition. The current execution condi-
tion could be the result of a single condition or of another logic block. AND
Load and OR Load are the two logic block instructions.
A data area that is used in a PC Link System so that data can be transferred
between two or more PCs. If a PC Link System is not used, the LR area is
available for use as work bits.
Short for Remote I/O Master Unit.
All of a program except for the subroutines.
Any of the areas in the PC used to hold data or programs.
A form of a ladder-diagram program that consists of a sequential list of the
instructions without using a ladder diagram. Mnemonic code is required to
input a program into a PC when using a Programming Console.
A mode of PC operation in which normal program execution is possible but in
which modification of data held in memory is still possible. Used for monitor-
ing or debugging the PC.
An input that is normally closed, i.e., the input signal is considered to be
present when the circuit connected to the input opens.
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