APCI-7xxx-3
Figures and Tables
63
Noise suppression
The suppression of undesirable electrical interferences to a signal.
Sources of noise include the ac power line, motors, generators,
transformers, fluorescent lights, CRT displays, computers, electrical
storms, welders, radio transmitters, and others.
Operating voltage
The operating voltage is the voltage that occurs during the continuous
operation of the device. It may not exceed the continuous limit
voltage. Furthermore, any negative operation situations, such as net
overvoltages over one minute at switching on the device must be
taken in consideration.
Optical isolation
The technique of using an optoelectric transmitter and receiver to
transfer data without electrical continuity, to eliminate high-potential
differences and transients.
Output voltage
The nominal voltage output reading when shaft is rotated to full
range, expressed in volts DC /Vo DC)
Parameter
The parameters of a control comprise all fort he control process
required numeric values, e.g. for limit values and technological
number.
PCI bus
PCI bus is a fast local bus with a clock rate up to 33 MHz. This bus is
used for processing a great number of data. The PCI bus is not limited
like the ISA and EISA systems.
Protective circuitry
A protective circuitry of the active part is done in order to protect the
control electronic. The simplest protective circuitry is the parallel
switching of a resistance.
Protective diode
At the input of the integrated MOS (Metal Oxide Semi-Conductor)-
circuits used diodes, which operate at the permitted input voltages in
the reverse range, but at overvoltage in the transition range and
therefore protects the circuits against damage.
Resolution
The smallest significant number to which a measurement can be
determined. For example a converter with 12-bit resolution can
resolve 1 part in 4096.
RS…
= Recommended standard number
RS232 A
serial
asynchronous communications standard used to connect
modems, terminals and printers with serial interfaces.
RS422 Electrical
characteristics of balanced-voltage digital interface circuits.
Maximum connection distance of 4000 feet.
RS485
The recommended standard of the Electronic Industry Association
that specifies the electrical characteristics of drivers and receivers for
use in balanced digital multipoint systems.
RTD
= Resistance temperature detector
An electrical circuit element characterized by a positive coefficient
for resistivity.
Sensor
A device that responds to physical stimuli (heat, light, sound,
pressure, motion, etc.) and produces a corresponding electrical output.
Settling time
The time required, after application of a step input signal, for the
output voltage to settle and remain within a specified error band
around the final value. The settling time of a system includes that of
all of the components of the system.
Short circuit
A short circuit of two clamps of an electric switch is when the
Summary of Contents for APCI-7300-3
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Page 26: ...APCI 7xxx 3 Figures and Tables 22 Fig 4 3 Component scheme of the APCI 7800 3 solder side ...
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Page 56: ...APCI 7xxx 3 Figures and Tables 52 Fig 7 21 Connection cable ST7825 8 x 25 pin ...