Omron CPM1A operation manual Sss

	Glossary
self-maintaining bit	A bit that is programmed to maintain either an OFF or ON status until set or reset
	by specified conditions.
series	A wiring method in which Units are wired consecutively in a string.
servicing	The process whereby the PC checks a connector or Unit to see if special proces-
	sing is required.
set	The process of turning a bit or signal ON.
set value	The value from which a decrementing counter starts counting down or to which
	an incrementing counter counts up (i.e., the maximum count), or the time from
	which or for which a timer starts timing. Set value is abbreviated SV.
shift input signal	An input signal whose OFF to ON transition causes data to be shifted one bit.
shift register	One or more words in which data is shifted a specified number of units to the right
	or left in bit, digit, or word units. In a rotate register, data shifted out one end is
	shifted back into the other end. In other shift registers, new data (either specified
	data, zero(s) or one(s)) is shifted into one end and the data shifted out at the
	other end is lost.
signed binary	A binary value that is stored in memory along with a bit that indicates whether the
	value is positive or negative.
signed decimal	One-word signed hexadecimal values stored in the two’s complement format
	can be displayed at the Programming Console as decimal values from –32,768
	to 32,767.
software error	An error that originates in a software program.
software protect	A means of protecting data from being changed that uses software as opposed
	to a physical switch or other hardware setting.
source (word)	The location from which data is taken for use in an instruction, as opposed to the
	location to which the result of an instruction is to be written. The latter is called
	the destination.
special instruction	An instruction input with a function code that handles data processing opera-
	tions within ladder diagrams, as opposed to a basic instruction, which makes up
	the fundamental portion of a ladder diagram.
SR area	A memory area containing flags and other bits/words with specific functions.
SSS	See SYSMAC Support Software.
store	The process of recording a program written into a display buffer permanently in
	memory.
subroutine	A group of instructions placed separate from the main program and executed
	only when called from the main program or activated by an interrupt.
subroutine number	A definer used to identify the subroutine that a subroutine call or interrupt acti-
	vates.
subtract count input	An input signal used to decrement a counter when the signal changes from OFF
	to ON.
SV	See set value.
switching capacity	The maximum voltage/current that a relay can safely switch on and off.
synchronous execution	Execution of programs and servicing operations in which program execution
	and servicing are synchronized so that all servicing operations are executed
	each time the programs are executed.

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