The choice of the right cable or line for transmitting signals on your own machine has essential influence on the device availability. Usually, when determining the instruments of machines and plants, a profound quantity of attention is given to choosing the right sensors.
For example, an individual determines which measuring principles are employed for level measurement, which power supply should be provided to the machine and which type of signal transmission should be used. Usually, the cables shown in the wiring schemes as simple connection lines between sensor and SPS are problematic. This poses an interesting paradox in the automation technology ? a sensor is tested for highest demands to make sure it meets certain requirements of the application, whereas a cable is only seen as a component which supposedly guarantees a reliable connection under all circumstances.
However, cables and connectors pose probably the most frequent sources of error. This is often where unforeseen prospect of increasing machine availability can be found. During my course of research I learned that in a higher two-digit percentage of most cases, renowned cable manufacturers traced back sensor failure on machines to mechanical failure of the cable due to faulty installation, handling and especially as a result of selection of an unsuited cable for the precise application. Principally, there is absolutely no patent fix for determining which cable and which plug connector is best suitable for the application.
For Lies , flexibility demands for cables used in level probes for level measurement in deep wells aren?t high, whereas the demands on tensile strength together with high longitudinal and transverse water tightness are. In level probes, plug connectors are barely ever applied due to the lack of permanent leak tightness. For machine tools which are set up in factory buildings, the easiest cable materials with a simple M12 connector are used. In this instance, however, the usage of a suitable cable that permanently withstands ambient conditions such as for example temperature fluctuations and that features resistance against oils and fats can significantly increase the option of your machine.
The usage of cable assemblies with factory pre-assembled connectors also prevents failure risk through improper on-site assembly. It is therefore a fallacy that cables are the same and that any given cable with the sufficient amount of wires would work for an application.
In one of my previous articles, I drew up a short overview of the most relevant criteria for choosing cables and connectors. Take your time in specifying the right cable for the application. Take into account the demands your plug link with sensors and PLC must meet. An individually matched wiring concept supplies a measurable increase of the machine availability and higher safety during operation.
Should you need assistance or consulting for specifying the right pressure sensor and associated cable / connector, feel free to contact us.