| Technology for Process Diagnostics |
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When faults occur in a system, identifying their cause is the most important requirement |
forimplementing measures to prevent the possibility of them occurring in the future.
However, the causes of system faults are often very difficult to determine. Suitable tools are now available thanks to the new functions provided in interface devices.
Device integrated data archiving can also be useful for centrally controlled systems, for example, with system faults that are accompanied by a fault in communication. Data that was generated before the fault was detected and rectified is irretrievably lost. Autonomous systems in particular are not provided with a convenient data archiving facility, which would otherwise considerably simplify the search for the cause of the system fault.
This is where the technology of the new Turck interface modules is particularly useful. An integrated data memory is continuously overwritten and also retains the data in the non-volatile memory in the event of a power failure. In this way, an interface device is turned into a transient recorder, in which the recorded signal trace can be read at any time with the FDT/DTM technology.
The PC can then be used to display and further process the time trace. The continuous recording of process variables enables an existing system to be analysed. The evaluation of the recorded data helps the planning engineer to optimise the existing system and estimate the effects of system expansions.
Weak points can be localised and the effect of improvements made can be logged and verified. This therefore increases the transparency of the system function and thus an understanding of the causal interrelationships involved. For this, the process variables are stored in a ring memory with the measuring cycle time of the device...
The author:
Dipl.-Ing. Jörg Tauert
is product specialist for interface technology
in the product marketing department of
Hans Turck GmbH & Co. KG
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