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WL Circuit Breaker selection and application guide
ETU communication
The ETU uses a Siemens proprietary communication network
called CubicleBus. The CubicleBus network ensures all Siemens
devices are able to transmit data reliably and efficiently. The ETU
can not be connected directly any other network so the use of
converters are necessary to allow communication between the
ETU and the outside world. The WL has three types of converters
to allow communication between the ETU and computer type
equipment. The three converts are:
• PROFIBUS (COM15)
• ModBus (COM16)
• HTML or TCP/IP (BDA)
The WL PROFIBUS converter is model ‘COM15.’ The COM15 device
acts as an interface between the WL breaker and the information
environment. A joint device master file (GSD) can be used for
integrating WL circuit breakers in a PROFIBUS-DP network. The
advantage of this joint communication profile is that the
same software can be used for automation, monitoring and
control systems.
The WL ModBus converter is model ‘COM16’. The COM16 device
enables the WL breaker to be connected to any ModBus master
network. Universal ModBus mapping can be used to allow custom
monitoring and controls with a centralized monitoring system.
The Modbus port is configured for RS485 connectivity and
can easily be daisy-chained to several WL breakers to create a
serial-network suitable for connecting to a LAN or WAN network.
The WL HTML or TCP/IP converter is called ‘BDA.’ The BDA
is a microcomputer with an embedded Linux operating
system running a web server application. The HTML pages
and JAVA codes are stored internal to the BDA and can be
accessed with an external PC web browser. All of the viewable
web pages are stored in the BDA. The BDA communicates to the
ETU through a front connected ribbon-cable. The PC accesses
the BDA through an integral DB-9 serial port or an RJ45
Ethernet port.
All three converters require a 24VDC Class 2 power supply.
See External Accessories for more information on available
power supplies.
Low Voltage Circuit Breaker
Electronic trip unit (ETU)
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