Addi-Data APCI-3003 Technical Description page 45

APCI-3003
Parameter
PCI bus
Protective circuitry
Protective diode
Reference voltage
Reference voltage
Resolution
Scan mode
Sensor
Sequence mode
Settling time
Short circuit
Short circuit current
Signal delay
Simple mode
Single Ended inputs
(SE)
The parameters of a control comprise all fort he control process
required numeric values, e.g. for limit values and technological
number.
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.
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.
At the input of the integrated MOS (Metal Oxide Semi-
Conductor)-circuits used diodes, which operates at the permitted
input voltages in the reverse range, but at overvoltage in the
transition range and therefore protects the circuits against
damage.
A point to which all further potentials of a series are referred
(often ground potential). In the field of control and regulation,
all voltages are measured against a reference voltage.
Reference voltages are stable voltages that are used as reference
unit. From them voltages can be derived that are required for
example in current supplies and in other electronic circuitries.
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.
Scan modes are: Single software scan, single hardware triggered
scan, continuous software scan, continuous software scan with
timer delay, continuous hardware triggered scan and continuous
hardware triggered scan with timer delay.
A device that responds to physical stimuli (heat, light, sound,
pressure, motion, etc.) and produces a corresponding electrical
output.
A sequence consists of a certain number of acquisitions, and the
sequence mode defines the mode of acquisition (simple
sequence mode and sequence mode with delay)
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.
A short circuit of two clamps of an electric switch is when the
concerning clamp voltage is zero.
Short circuit current is the current between tow short-circuited
clamps.
The change of a signal affects the following circuitries with
finite velocity; the signal will be delayed. Besides the signal
delay times that are not wanted, the signal delay can be
extended by time switches and delay lines.
The software initializes and starts the A/D conversion and after
this step it reads the digital value of one or more channels.
An analog input with one input terminal whose value is
measured with respect to a common ground
Appendix
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