Glossary
380
loop
A group of instructions that can be executed more than once in succession
(i.e., repeated) depending on an execution condition or bit status.
LR area
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.
LSS
Abbreviation for Ladder Support Software.
main program
All of a program except for the subroutines.
masking
‘Covering’ an interrupt signal so that the interrupt is not effective until the
mask is removed.
Master
Short for Remote I/O Master Unit.
memory area
Any of the areas in the PC used to hold data or programs.
mnemonic code
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.
MONITOR mode
A mode of PC operation in which normal program execution is possible, and
which allows modification of data held in memory. Used for monitoring or de-
bugging the PC.
most-significant (bit/word)
See
leftmost (bit/word).
NC input
An input that is normally closed, i.e., the input signal is considered to be
present when the circuit connected to the input opens.
nest
Programming one loop within another loop, programming a call to a subrou-
tine within another subroutine, or programming an IF-ELSE programming
section within another IF-ELSE section.
Network Service Board
A device with an interface to connect devices other than PCs to a SYSMAC
NET Link System.
Network Service Unit
A Unit that provides two interfaces to connect peripheral devices to a SYS-
MAC NET Link System.
node
One of the positions in a LAN. Each node incorporates a device that can
communicate with the devices at all of the other nodes. The device at a node
is identified by the node number. One loop of a SYSMAC NET Link System
(OMRON’s LAN) can consist of up to 126 nodes. Each node is occupied by a
SYSMAC NET Link Unit mounted to a PC or a device providing an interface
to a computer or other peripheral device.
NO input
An input that is normally open, i.e., the input signal is considered to be pres-
ent when the circuit connected to the input closes.
noise interference
Disturbances in signals caused by electrical noise.
nonfatal error
A hardware or software error that produces a warning but does not stop the
PC from operating.
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