Fagus-GreCon Greten GmbH
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Detection and Combating Sparks in Pneumatic Extraction and Conveyor
Equipment
Fire hazards, created by chipping machines in the wood processing and
in the foods, feeds, textile, leather and chemical industrial
operations introduce a high risk into the automation process.
Smoldering fires and dust explosions can result from the sparks
produced by the machines. Highly sensitive sensors are used of
detecting sparks. A micro-controller module acquires and evaluates the
sensor data and directs the extinguishing process, if required.
Activation of the sensors requires a specific electronics, which also
enables diagnostics for detection of wire break and short-circuit along
with information acquisition. The sensor data are processed by the
micro-controller and transferred via a CANopen network to a central
master. Each master can be assigned up to 48 nodes.
The master then operates as a CANopen I/O device in a superordinate
CANopen network. Operator terminals display the transferred data and
provide information on the detected and averted potential hazard.
SYS TEC created a high-performance micro-controller control system for
real time activation of the on-board peripheral using integrated
CANopen communications. In this instance, both the hardware and the
software was designed and implemented by SYS TEC. SYS TEC’s PLC runtime
system was tailored to the specific customer requirements and
seamlessly integrated on the module. The control system enables
parallel execution of PLC programs and customer-specific program
components programmed in C programming language that are loadable at
runtime. In this system the highly efficient operating system controls
the prioritized execution of a processing function for detecting sparks
and their direction of flight as well as the communications process.
The interface for the connection of two CAN networks was created by
using SYS TEC’s instance-capable CANopen protocol stack. Data
processing by the control system can be done using a program written in
C or in any IEC 61131-3 conformant PLC language. All program components
are loaded to the control using the OpenPCS programming environment.
Here, too, the data transfer is done over the CAN-bus using CANopen. An
integrated Gateway server makes it possible to forward CAN information
in subordinate CAN-bus segments. The combination of programs written in
C and IEC 61131-3 PLC language makes possible convenient diagnosis
using OpenPCS without expensive additional tools. Results of data
processing are transferred to variables of the PLC program and, in this
fashion, can be monitored and manipulated using the OpenPCS Online
testing and start-up. In addition, the available CANopen interface
provides the opportunity to read or write data using the object
dictionary of the respective CANopen instance. SYS TEC designed and
developed the necessary software components for all data transfer
services.
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