D300529 0115 - BL67 I/O modules
16-3
EMC
Electromagnetic compatibility – the ability of an electrical part to operate in a specific environment without fault
and without exerting a negative influence on its environment.
EN
German acronym for European Standard.
ESD
Electrostatic Discharge.
Field power supply
Voltage supply for devices in the field as well as the signal voltage.
Fieldbus
Data network on sensor/actuator level. A fieldbus connects the equipment on the field level. Characteristics of a
fieldbus are a high transmission security and real-time behavior.
Force Mode
Software mode which enables the user to set his plant to a required state by forcing certain variables on the input
and output modules.
GND
Abbreviation of ground (potential "0").
Ground
Expression used in electrical engineering to describe an area whose electrical potential is equal to zero at any
given point. In neutral grounding devices, the potential is not necessarily zero, and one speaks of the ground
reference.
Ground connection
One or more components that have a good and direct contact to earth.
Ground reference
Potential of ground in a neutral grounding device. Unlike earth whose potential is always zero, it may have a
potential other than zero.
Hexadecimal
System of representing numbers in base 16 with the digits 0…9, and further with the letters A, B, C, D, E and F.
Hysteresis
A sensor can get caught up at a certain point, and then "waver" at this position. This condition results in the
counter content fluctuating around a given value. Should a reference value be within this fluctuating range, then
the relevant output would be turned on and off in rhythm with the fluctuating signal.
I/O
Input/output.
Impedance
Total effective resistance that a component or circuit has for an alternating current at a specific frequency.
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