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link
linkable slot
Link System
Link Unit
main line
Master
noise interference
Optical Slave Rack
Optical I/O Unit
optical cable link
optical communications
optical fiber cable
Output Block
Output Remote Terminal
PC
PC System
peripheral device
printed circuit board
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Glossary
A hardware or software connection formed between two Units. "Link" can
refer either to a part of the physical connection between two Units (e.g., opti-
cal links in Wired Remote I/O Systems) or a software connection created to
data existing at another location (Network Data Links).
A slot on either a CPU or Expansion I/O Backplane to which a Link Unit can
be mounted. Backplanes differ in the slots to which Link Units can be
mounted.
A system that includes one or more of the following systems: Remote I/O
System, PC Link System, Host Link System, or Net Link System.
Any of the Units used to connect a PC to a Link System. These are Remote
I/O Units, I/O Link Units, PC Link Units, Host Link Units, and Net Link Units.
n a Link System connected through Branching Link Adapters, the communi-
cations cable that runs from the Unit at each end of the System through the
Link Adapters.
Short for Remote I/O Master Unit.
Disturbances in signals caused by electrical noise.
A Slave Rack connected through an Optical Remote I/O Slave Unit.
A Unit that is connected in an Optical Remote I/O System to provide 8 I/O
points. Optical I/O Units are not mounted to a Rack.
In a Wired Remote I/O System, an optical cable connecting two Converting
Link Adapters. Specified because the System otherwise uses wire communi-
cations.
A communications method in which signals are sent over optical fiber cable
to prevent noise interference and increase transmission distance.
Cable made from light conducting filaments used to transmit signals.
A Unit used in combination with a Modular Remote Terminal. An Output
Block provides mounting positions for replaceable relays. Each relay can be
selected according to specific output requirements.
A Remote Terminal that provides output points.
An acronym for Programmable Controller.
With building-block PCs, all of the Racks and independent Units connected
directly to them up to, but not including the I/O devices. The limits of the PC
System on the upper end is the PC and the program in its CPU Unit and on
the lower end, I/O Units, Special I/O Units, Optical I/O Units, Remote Termi-
nals, etc.
Devices connected to a PC System to aid in system operation. Peripheral
devices include printers, programming devices, external storage media, etc.
A board onto which electrical circuits are printed for mounting into a comput-
er or electrical device.
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