Siemens SIMATIC ET 200iSP

Redundancy
In redundant systems, important automation components are available in multiple units
(redundant). If a redundant component fails there the processing of the program is not
interrupted.
With S2 redundancy, one interface module is connected to the two (redundant) IO controllers.
With R1 redundancy, each of the two interface modules is connected to the two (redundant) IO
controllers.
Reference potential
The potential from which the voltages of the electrical circuits are evaluated and/or measured.
RTD
Measuring temperatures with resistance thermometers RTD (resistance temperature detection).
Segment
The bus cable between two terminating resistors forms a segment. One RS 485-IS segment (on
the RS 485-IS coupler) contains 31 bus nodes.
SELV
Safety Extra Low Voltage
SIMATIC mode
SIMATIC mode is a communication protocol developed by Siemens for synchronizing clocks in
automation systems via Industrial Ethernet. SIMATIC mode uses a connectionless multicast
protocol. Mode:
• PCS 7 compatible mode
• S5-compatible mode
SIMATIC PCS 7
PCS 7 is a powerful process control system with integrated programming, operator control and
monitoring. Information on this can be found in the St 70 catalog and the help integrated in the
PCS 7 engineering tool (ES) and operator control and monitoring system (OS).
SIMATIC PDM
SIMATIC PDM (Process Device Manager) is a tool for con󹪝guring, parameterizing, commissioning
and diagnosing intelligent process devices. SIMATIC PDM makes it possible to con󹪝gure a large
number of process devices from di󹪜erent manufacturers under a uniform user interface using
one software.
Glossary
ET 200iSP
470 Operating Instructions, 11/2022, A5E00247483-AK