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PC104-PLUS1500
Level
Limit value
MSB
MUX
Noise immunity
Noise suppression
Operating voltage
Optical isolation
Opto-coupler
OR-connection
Output current
Output voltage
technology micro processors can react fast to external
requirements.
Logic levels are defined in order to process or show
information. In binary circuits voltages are used for digital
units. Only two voltage ranges represent information. These
ranges are defined with H (High) and L (Low). H represents
the range that is closer to Plus infinite; the H level is the digital
1. L represents the range that is closer to Minus infinite; the L
level is the digital 0. The rising edge is the transition from the
0-state to the 1-state and the falling edge is the transition from
the 1-state to the 0-state.
Exceeding the limit values, even for just a short time, can lead
to the destruction or to a loss of functionality.
= Most significant bit
The bits are of different importance. The lowest significance
has the bit that stands most at the right. It is also defined as
"least significant bit" (LSB) whereas the first bit is the most
important bit and therefore is defined as „most significant bit"
(MSB).
= Multiplexer
An array of semiconductor or electromechanical switches with
a common output used for selecting one of a number of input
signals.
Noise immunity is the ability of a device to work during an
electromagnetic interference without reduced functions.
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.
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.
The technique of using an optoelectric transmitter and receiver
to transfer data without electrical continuity, to eliminate high-
potential differences and transients.
With an opto-coupler direct current voltage can be transferred.
The advantage is the small size.
A complete disjunction is an OR-connection of all input
variables, independently of if it is either denied or not denied
available.
The maximum amount of current the sensor can supply across
the output signal, expressed as amps DC (A DC).
The nominal voltage output reading when shaft is rotated to
full range, expressed in volts DC /Vo DC)
Appendix
45
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