Addi-Data PC104-PLUS1500 Technical Description page 46

Appendix
PC/104
PCI bus
PLD
Protective circuitry
Protective diode
Reference voltage
Reference voltage
Resolution
Sensor
Settling time
Short circuit
Short circuit current
Signal delay
Single Ended inputs
(SE)
46
The PC/104 and PC104/-Plus are new bus standards. The
electrical and logic layout of the both bus systems can be
compared with the ISA and PCI bus so that the software will
detect no difference between these both bus system:
Advantages:
- Compact mounting that saves space
- Use of standard bus and processor technologies
- Easily extendable
- Short development times
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.
= Programmable Logic Device
Prorammable logic 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.
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.
A device that responds to physical stimuli (heat, light, sound,
pressure, motion, etc.) and produces a corresponding electrical
output.
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.
An analog input with one input terminal whose value is
measured with respect to a common ground
PC104-PLUS1500