WL Circuit Breakers - Siemens

Overview of the Bus Systems
WL Circuit Breaker
Communication bus systems are used
to connect distribution devices with
varying levels of intelligence. With
their different structures and
mechanisms, certain bus systems
are designed for highly specific
applications, while others are better
suited for more open applications.
The following section describes bus
systems used in automation and power
distribution systems.
Graphic
1-1
WL PROFIBUS/MODBUS Communication and Electronic Accessories
PROFIBUS
PROFIBUS-DP is an open, standardized,
multi-vendor field bus system. Standardized
to DIN (E) 19424 Part 3 / EN 50170, it
is ideally suited to fulfill the stringent
requirements for exchanging data in
distributed peripheral and field devices.
A PROFIBUS device can be easily integrated
in and connected to standard automation
systems. Many major manufacturers of
programmable control systems offer
PROFIBUS-DP master modules. The high
transmission rates of up to 12 MBaud
ensure virtually real-time system operation.
The protocol used by the PROFIBUS-DP
stations supports communication between
the complex, equal-priority programmable
Active Stations, master devices
PROFIBUS
M M
WL Circuit
Breaker Sensor Actuator Actuator Sensor Actuator
Passive Stations, slave devices
Communication on the PROFIBUS: token passing between the masters; polling between the master and slave stations
SECTION 1
controllers (masters). Each station completes
its communication task within a defined
time frame.
In addition, straightforward, cyclic and
acyclic data exchange is carried out for
communication between a master and
the simple peripheral devices (slaves)
assigned to it.
PROFIBUS-DP achieves this using a bus
access control mechanism comprising a
central token passing procedure between
the active stations (masters) and a central
master-slave procedure for exchanging data
between the active and passive stations.
Bus access control enables the following
system configurations to be implemented:
V
Meas.
Value
Transmit
1/4