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Flexible evaluation in machine safety circuits



Flexible evaluation electronics, means being able to be adapted to any kind of safety sensor system. This is exactly what the new eloFlex from the Allgäu-based sensor specialist elobau has been designed for: flexibility of parameter selection for logic control and input and output sensors. This means the type of sensor can be freely chosen for each of the four inputs. There are either 2 normally open sensors and emergency-stop available, or the normally open-normally closed principle. In this latter case, the order in which the two contacts are actuated is not taken into account. In addition, operation as two-hand safety control can be selected for two sensor inputs. The evaluation of 24V PNP outputs, such as is standard for light grids, is also possible.

The safety evaluation unit has four outputs where one or more of the four input sensors can be assigned to via a freely selectable logic gate (AND, OR, NAND, NOR, XOR and XNOR). A delay time of between 0 and 99.9 s can be set in 100 ms steps for each safety output. In addition, there is an output for error messages available that can be linked to an SPC (example). Separate inputs are available for monitoring external gates. elobau takes over the programming and validation of the required configuration and then tests the functionality of the safety evaluation unit using a special test program. This saves valuable configuration and test programming time / cost for the end user. In addition each unit is very clearly identified with the respective programming.

There is a choice of SIL 2 and SIL 3 (Safety Integrity Levels in accordance with EN 62061) for all variants. A UL/ETL approval is available.

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