Glossary
Glossary-4
ET 200X Distributed I/O Device
EWA 4NEB 780601602-06
FREEZE
This is a control command of the DP master to a group of DP slaves.
When a DP slave receives the FREEZE control command, it freezes the current
status of the inputs and transfers them cyclically to the DP master.
After each subsequent FREEZE control command, the DP slave freezes the
status of the inputs again.
The input data is not transferred from the DP slave to the DP master again
cyclically until the DP master sends the UNFREEZE control command.
Frequency converter
On the ET 200X the frequency converter is used for infinitely variable adjustment
of the speed and adaptation of the power of asynchronous motors up to 1.5 kW
rated power. Temperature monitoring device and motor brake are integrated.
The converter is parameterized appropriately for the connected motor. Operation
of the frequency converter is controlled by the software.
Ground
The conductive mass of earth, the electrical potential of which can be set to zero
at any point. In the vicinity of grounding electrodes the potential may not be zero.
The term ”reference ground” is often used here.
Grounding
Grounding means to connect a conductive component with the grounding
electrode via a ground system.
Isolated
In the case of isolated input/output modules, the reference potentials of the
control and load circuit are galvanically isolated – by means of optical isolators or
relay contacts, for example. Input/output circuits can be grouped.
Master
When they are in possession of the token, masters can send data to and request
data from other nodes (= active node). The CPU 315-2 DP and the IM 308-C are
examples of DP masters.
Motor starter
Motor starter is the overall term for Direct and Reversing Starters. Motor
starters determine the start-up and direction of rotation of a motor (= load).
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