Glossary
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syntax error An error in the way in which a program is written. Syntax errors can include
‘spelling’ mistakes (i.e., a function code that does not exist), mistakes in specify-
ing operands within acceptable parameters (e.g., specifying read-only bits as a
destination), and mistakes in actual application of instructions (e.g., a call to a
subroutine that does not exist).
SYSMAC Support Software A software package installed on a IBM PC/AT or compatible computer to func-
tion as a Programming Device.
system configuration The arrangement in which Units in a System are connected. This term refers to
the conceptual arrangement and wiring together of all the devices needed to
comprise the System.
system error An error generated by the system, as opposed to one resulting from execution of
an instruction designed to generate an error.
system error message An error message generated by the system, as opposed to one resulting from
execution of an instruction designed to generate a message.
system setup Operating environment settings for a Programming Device, e.g., the LSS or
SSS.
terminal instruction An instruction placed on the right side of a ladder diagram that uses the final
execution conditions of an instruction line.
timer A location in memory accessed through a TIM/CNT bit and used to time down
from the timer’s set value. Timers are turned ON and reset according to their
execution conditions.
TR area A data area used to store execution conditions so that they can be reloaded later
for use with other instructions.
TR bit A bit in the TR area.
trace An operation whereby the program is executed and the resulting data is stored to
enable step-by-step analysis and debugging.
trace memory A memory area used to store the results of trace operations.
transfer The process of moving data from one location to another within the PC, or
between the PC and external devices. When data is transferred, generally a
copy of the data is sent to the destination, i.e., the content of the source of the
transfer is not changed.
transmission distance The distance that a signal can be transmitted.
trigger A signal used to activate some process, e.g., the execution of a trace operation.
trigger address An address in the program that defines the beginning point for tracing. The
actual beginning point can be altered from the trigger by defining either a positive
or negative delay.
UM area The memory area used to hold the active program, i.e., the program that is being
currently executed.
Unit In OMRON PC terminology, the word Unit is capitalized to indicate any product
sold for a PC System. Most of the names of these products end with the word
Unit.
unit number A number assigned to some Units to facilitate identification when assigning
words or other operating parameters.
unmasked bit A bit whose status is effective. See
masked bit
.
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