D300529 0115 - BL67 I/O modules
16-5
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.
Protective earth
Electrical conductor for protection against dangerous shock currents. Generally represented by PE (protective
earth).
Radiation coupling
A radiation coupling appears when an electromagnetic wave hits a conductive structure. Voltages and currents
are induced by the collision. Typical sources of interference are e. g. sparking gaps (spark plugs, commutators
from electric motors) and transmitters (e. g., radio), that are operated near to conducting structures.
Reaction time
The time required in a bus system between a reading operation being sent and the receipt of an answer. It is the
time required by an input module to change a signal at its input until the signal is sent to the bus system.
Reference potential
Potential from which all voltages of connected circuits are viewed and/or measured.
Repeater
Amplifier for signals transmitted via a bus.
Root-connecting
Creating a new potential group using a power distribution module. This allows sensors and loads to be supplied
individually.
RS 485
Serial interface in accordance with EIA standards, for fast data transmission via multiple transmitters.
Serial
Type of information transmission, by which data is transmitted bit by bit via a cable.
Setting parameters
Setting parameters of individual stations on the bus and their modules in the configuration software of the
master.
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