Rockwell Automation 57C570 AutoMax PC3000 User Manual - Manual (Page 284)

HĆ4
nonĆvolatile: variables that store data whose value is retained through power
cycles of the PC3000 Application Interface (PCI) and Stop All conditions.
optical power: the power emitted from a light source into a fiberĆoptic cable;
defined in watts but usually expressed in decibels.
optical power budget: the total amount of optical power available from the
fiberĆoptic transmitter less the losses present in the fiberĆoptic link.
output image table: See I/O image table.
parallel port: an electrical connection on a computer capable of transmitting or
receiving two or more bits of data at one time; the communications port to which
devices such as parallel printers can be attached.
PC: Personal computer.
PC3000 Processor: exchanges information between programs using the
Common memory variables and runs your application programs. See also CPU.
PCI: PC3000 Application Interface. Exchanges data between an AutoMax
PC3000 and a PC's microprocessor via the ISA bus.
physical drop: the drop number assigned to a drop. See also Drop Number.
plug: a movable portion of a coaxial RF connector attached to a cable or
removable assembly.
program: synonymous with and used in place of the term task.
raceway: any channel designed expressly and used solely for holding wires
and cables.
rack: See I/O Rack.
reflections: return of the radio frequency energy towards the source which is
caused by an impedance mismatch along the transmission path.
remote I/O: I/O connected to a processor across a serial link. With a serial link,
remote I/O can be located long distances from the processor.
remote I/O link: a serial link for carrying I/O data between a processor
(scanner) and remote I/O adapters.
remote I/O scanner: a separate module or component of a module that
provides communication with remote I/O adapters across a remote I/O link.
RG: a symbol used to designate coaxial cables made to a government
specification.
RSĆ232/422: EIA electrical connection standards for serial binary
communication between data terminal equipment and data communications
equipment.
serial port: an electrical connection on a computer that handles data bits one
after another; the communications port (COM1 or COM2) to which devices such
as a modem, a mouse, or a serial printer can be attached.
shield: a sheet, screen or braid of metal (usually copper, aluminum, or other
conducting material) usually placed between a dielectric and a jacket of a
coaxial cable.
slot: See module slot.
surge: a temporary and relatively large increase in the voltage or current in an
electric circuit or cable.
task: See program.
transceiver: a module composed of a transmitter and receiver.
virtual drop: drop numbers created when a drop depth is specified enabling a
device to function as more than one drop. See also Drop Depth.