Monday 31 May 2010

Highest level of safety for up to 64 sensors

Digital input modules for the control system PNOZmulti

The IP67 digital, decentralised input module PDP67 F 8DI ION is now available from Pilz, enabling a higher number of sensors to be connected safely, even outside the control cabinet. As a result, decentralised monitoring of all sensors in the field can be connected to the configurable control system PNOZmulti.

The digital input modules enable contact-based as well as electronic sensors to be connected outside the control cabinet with as much as ease as inside, in accordance with PL e of EN ISO 13849-1 and SIL 3 of EN/IEC 62061; the unit carries out the required feasibility check. As a result, the PNOZmulti is available as an evaluation device for centralised as well as decentralised sensor technology, with proven configuration and diagnostic functions via the PNOZmulti Configurator.

Communication is via a safe data link, so up to 64 safe sensors can be monitored decentrally. Hardware costs are reduced because this solution manages without a local control cabinet and uses only a single cable for communication and supply. All the benefits of the PNOZmulti product range can be enjoyed – free and easy configuration, rapid diagnostics plus the option to monitor a wide range of safety functions with just one unit.

It’s important to note that safety level PL e of EN ISO 13849-1 is only maintained when electronic sensors are used, as these enable a feasibility check. The time needed for this feasibility check must be taken into account in the machine configuration, to ensure that an e-stop is triggered in time in the event of danger.

If contact-based sensors are used, the performance level for a corresponding interface will be assessed as PL c in accordance with the standard EN ISO 13849-1.

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