Glossary
251
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.
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 opera-
tion.
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 pos-
itive 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 prod-
uct 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.
unsigned binary A binary value that is stored in memory without any indication of whether it is
positive or negative.
uploading The process of transferring a program or data from a lower-level or slave
computer to a higher-level or host computer. If a Programming Devices is
involved, the Programming Device is considered the host computer.
watchdog timer A timer within the system that ensures that the scan time stays within speci-
fied limits. When limits are reached, either warnings are given or PC operation
is stopped depending on the particular limit that is reached.
To Next Page
Loading...
Need help?
General
