Communication Structure Of The Sentron Circuit Breakers - Siemens SENTRON VL Series System Manual

Introduction and overview
1.2 Bus systems
Message frames
The message frames allow process data (input/output data) to be written or read either
individually or in groups.
Modbus RTU is used on different transmission media. Implementation on the RS485
physical bus, a shielded, twisted-pair cable with terminating resistors as on PROFIBUS DP,
is widespread.
Applications
The Modbus RTU protocol is used for:
● Networking of controllers
● Linking input/output modules
Use of Modbus RTU is recommended above all for applications with:
● Low time requirements
1.2.4

Communication structure of the SENTRON circuit breakers

The figure below provides an overview of the communication options of the SENTRON
circuit breakers and their modules.
The SENTRON circuit breaker system is extremely flexible:
● The lowest level is the simple parameterization of the circuit breakers.
● The field level includes a PLC and software tools where necessary.
The individual circuit breakers and their modules are described in the following chapters.
The graphic below shows the system architecture of the SENTRON circuit breakers.
Since the communication profile is identical with that of PROFIBUS DP, software tools can
be shared.
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3WL/3VL circuit breakers with communication capability - PROFIBUS
System Manual, 03/2011, A5E01051353-02