Response Electronics CL6011B Dokumentacja Strona 145

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Original — December 1991
UM4.6:CS6003
Glossary-23
Optical Isolation
The technique of electrically isolating two circuits by converting an
electrical signal to an optical signal and back again. Optical isolators
commonly consist of an LED and a phototransistor mounted in a DIP.
Original Equipment Manufacturer (OEM)
The firm that makes a product sold by another firm. For example, Hewlett
Packard is the OEM for some products sold by Fisher Controls.
OT Acronym: Output Tracking
OUT Abbreviation: Output Signal
Output Signal (OUT)
A signal produced by a device, often per a program instruction or
command, and typically used as the input to a different device.
Output Tracking
A technique commonly used in override or cascade control applications
where an analog value read fron the track signal value input of a
controller is substituted for the IVP value calculated by the PCA.
Overwrite To write data to a memory that already contains information, replacing
that information with new information.
P
P Abbreviation: Proportional Control Action (Gain)
Packet (PKT) A block of data, or message, handled by a communications network in a
well-defined format. Packets in PROVOX systems include headers and
maximum sizes of their data fields.
PAL Acronym: Programmable Array Logic
Parallel Simultaneous: said of data transmission on two or more channels at the
same time.
Parallel Discrete Output (PDO)
A PROVOX point type. A PDO point generates values for as many as 16
discrete output channels, in the form of a binary value (0-65535) or
binary-coded decimal value (0-9999). A common use for a PDO point is
to control a hardware device that requires multiple discrete signals.
Parallel Interface
A data transmission device that provides a channel for each bit of a byte,
thus permitting simultaneous transmission of all the bits.
Parallel Interface Adapter
An integrated circuit device that provides a number of parallel discrete
input and output signals that can be controlled by the address and data
signals of an MPU.
O
p
t - Par
Glossary
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