Siemens SIMATIC ET 200M Manual page 223

Glossary
IP20
Degree of protection to DIN 40050: Protection against contact with fingers and
against foreign bodies longer than 12 mm ∅.
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).
³ The CPU 315-2 DP and the IM 308-C are examples of DP masters.
Master-slave access method
A bus access method in which only one node is the ³ DP master and all the
other nodes are ³ DP slaves.
Non-isolated
In the case of non-isolated input/output modules, the reference potentials of the
control and load circuit are electrically connected.
Parameter assignment
Parameter assignment means setting the behavior of a module.
Parameter assignment master
Each DP slave has one parameter assignment master. During startup the
parameter assignment master transfers the parameterization data to the DP
slave. The master has read and write access to the DP slave and it can change
the configuration of a DP slave.
PLC
³ Programmable controller
Glossary-6
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