Rockwell Automation 1772-L8_LW_LWP_LX_LXP,D17726.5.8 User Manual - Manual (Page 441)

Glossary
Appendix D
D-22
State
The logic 0 or 1 condition in processor memory or at a circuit input
or output.
Storage
See Memory.
Storage Bit
A bit in a data table word which can be set or reset, but is not associated
with a physical I/O terminal point.
Subroutine
A program segment in the ladder diagram that performs a specific task and
is available for use.
Subroutine Area (SBR)
A portion of memory where subroutines are stored.
Subsystem
(1) A part of a larger system having the properties of a system in its own
right. (2) A system within another system.
Suppression Device
A unit that attenuates the magnitude of electrical noise.
Surge
A transient current or power.
Synchronous
A type of serial transmission that maintains a constant time interval
between successive events.
Synchronous Shift Register
A shift register where only one change of state occurs per control pulse.
Syntax
Rules governing the structure of a language.
System
A set of one or more processors, I/O devices and modules, computers, the
associated software, peripherals, terminals, and communication networks,
that together, provide a means of performing information processing for
controlling machines or processes.