Glossary
D301271 1013 - FGEN - multi protocol15-4
Low impedance connection
Connection with a low AC impedance.
LSB
Least Significant Bit
Mass
All interconnected inactive components that do not take on a dangerous touch potential in the case of a fault.
Master
Station in a bus system that controls the communication between the other stations.
Master/slave mode
Mode of operation in which a station acting as a master controls the communication between other stations in a
bus system.
Module bus
The module bus is the internal bus in a BL20 station. The BL20 modules communicate with the gateway via the
module bus which is independent of the fieldbus.
MSB
Most Significant Bit
Multi-master mode
Operating mode in which all stations in a system communicate with equal rights via the bus.
NAMUR
German acronym for an association concerned with standardizing measurement and control engineering.
NAMUR initiators are special versions of the two-wire initiators. NAMUR initiators are characterized by their high
immunity to interference and operating reliability, due to their special construction (low internal resistance, few
components and compact design).
Overhead
System administration time required by the system for each transmission cycle.
PLC
Programmable Logic Controller.
Potential compensation
The alignment of electrical levels of electrical components and external conductive components by means of an
electrical connection.
Potential free
Galvanic isolation of the reference potentials in I/O modules of the control and load circuits.
Potential linked
Electrical connection of the reference potentials in I/O modules of the control and load circuits.
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