Response Electronics CL6011B Dokumentacja Strona 148

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Original — December 1991
UM4.6:CS6003
Glossary-26
Process 1. A collection of physical devices and methods used in the production or
manufacturing of a product.
2. A subdivision of a procedure defined for batch tracking or operator
intervention at the batch cycle control level. A process in a procedure
normally corresponds to a stage of a multi-stage production process.
Process Input/Output (PIO)
The name of an interactive controller circuit card that accepts analog
input signals, performs A/D and D/A conversions, and generates analog
output signals.
Process Instrumentation (PI)
The department of Fisher Controls that designs and manufactures
PROVOX and UNIVOX systems.
Process Variable (PV)
A physical quality or quantity which is monitored as part of a control
strategy. Common process variables are temperature, level, and rate of
flow. The term measured variable is a synonym.
Product Data A list of amounts, ingredients, loop setpoints, and so forth, that can be
altered to produce variations in product or grade.
PROFLEX The trademark for Fisher Controls’ line of configuration devices for
certain process control systems. ASCII text files are the principal
distinguishing feature of configuration via a PROFLEX device.
Programmable Array Logic (PAL)
A type of semiconductor device that can be used in place of many
individual integrated logic gates. A user can program the PAL device with
a complete logic pattern.
Programmable Controller Interface Unit (PCIU)
A PROVOX highway device that permits programmable controllers to
receive and respond to commands from other PROVOX devices such as
consoles, trend units, and UOCs, via the data highway.
Programmable Logic Controller (PLC)
A microprocessor or mini-computer system able to perform simple
analog and discrete control. PLC’s were developed as replacements for
relay control panels, and are typically used for motor control.
Programmable Read-Only Memory (PROM)
A chip programmable only by means of a special device; once
programmed in this way, it becomes a ROM.
Programmable Serial Interface (PSI)
The printed wiring board that fits into a Hewlett Packard computer,
interfacing the computer and I/O peripherals that use serial data
transmission.
Proc - Pro
g
Glossary
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