WL Circuit Breakers - Siemens

Communication with the WL Breaker
WL Circuit Breaker
The WL Circuit Breaker supports the
industry standard MODBUS protocol
through the COM16 interface.
Communication connections to the
COM16 are made through the DB-9 port
on the front of the COM16; see Graphic
4-2 for connecting cable pin assignments.
Customers can connect twisted shielded
pair RS 485 cable to Ethernet Converters,
MODBUS Masters, PLCs or supervisory control
systems. When the WL Circuit Breaker is
installed in Siemens switchgear as part of
an ACCESS power monitoring system, the
default wiring will be through a Siemens
power meter Ethernet gateway or Ethernet
converter connected to a WinPM.Net
workstation. For customers with existing
MODBUS networks or who require
Graphic
4-1
WinPM.Net
integration into a MODBUS system the
following information can be used
to develop a software interface to the
WL COM16.
Data in the COM16 is organized in what is
referred to as “Datasets.” Each dataset
contains a group of functionally common
registers. For instance all metered data is
organized in a dataset, which consists of
119 registers, min./max. information in
another dataset, and diagnostic information
in another dataset. In all, the COM16 has a
total of 28 datasets, which can be read via
communication. Users can take advantage
of this structure and ask for blocks of data
in one message request, making integration
into MODBUS systems fast and efficient.
The COM16 also supports pre-configured
or standard register maps for simple data
interfacing. Users can define what types
of data they want in any of three default
register sets. Type 1 provides 4 default
registers, Type 2 provides 8 registers, and
Type 3 provides 14 registers, all in
consecutive order for easy requests.
Each register includes a corresponding
status register, which can be read in order
to validate the real-time data. This register
is referred to as the property byte.
The WL Circuit Breaker can be configured
remotely using the WinPM.Net software or
using the set-up tool, WL Config.
Siemens Power Monitoring and control software WinPM.Net communicates to multiple device types using Ethernet, modem and RS 485 serial networks.
The integration of the WL Circuit Breaker into WinPM.Net is a key component of totally integrated power.
4/1 WL PROFIBUS/MODBUS Communication and Electronic Accessories