Glossary
Glossary-6
Distributed I/O System ET 200S
EWA 4NEB 780 6024-02 07
PROFIBUS address
Each bus node must receive a PROFIBUS address to identify it uniquely on the
PROFIBUS.
The PC/programming device has the PROFIBUS address “0”.
The PROFIBUS addresses 1 to 125 are permitted for the ET 200S distributed I/O
system.
Programmable controller
A programmable logic controller consisting of at least one CPU, various input and
output modules, and operator interfaces.
Reference potential
Potential from which the voltages of the circuits involved can be observed and/or
measured.
Reversing starter
A reversing starter is a ³ motor starter that determines the direction of rotation of
a motor. It consists of a circuit breaker and two contactors.
Segment
The bus line between two terminating resistors forms a segment. A segment
contains 0 to 32 ³ bus nodes. Segments can be interconnected by means of
RS 485 repeaters.
SELV
Safety Extra Low Voltage = safety extra-low voltage
Slave
A slave can only exchange data with a ³ master when requested by it to do so. By
slaves we mean, for example, all DP slaves such as ET 200X, ET 200M, ET 200S,
etc.
SSI
The positional information is transferred synchronously on the basis of the SSI
(synchronous serial interface) protocol. The SSI protocol is used with absolute
encoders.
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