This website uses cookies primarily for visitor analytics. Certain pages will ask you to fill in contact details to receive additional information. On these pages you have the option of having the site log your details for future visits. Indicating you want the site to remember your details will place a cookie on your device. To view our full cookie policy, please click here. You can also view it at any time by going to our Contact Us page.

Support for safety-related machine control

21 July 2010

Designed to provide developers and testers of safety-related machine controls with comprehensive support in the evaluation of safety in the context of EN ISO 13849-1, Sistema software is available for download on

Support for safety-related machine control
Support for safety-related machine control

Sistema stands for "Safety Integrity Software Tool for the Evaluation of Machine Applications’ and enables users to model the structure of the safety-related control components based upon the designated architectures. This, in turn, allows automated calculation of the reliability values with various levels of detail, including that of the attained Performance Level (PL).

Relevant parameters such as the risk parameters for determining the required Performance Level (PLr), the Category, measures against common-cause failures (CCFs) on multi-channel systems, the average component quality (MTTFd) and the average fault detection level (DCavg) of components and blocks, are entered step by step in forms. Once the required data have been entered into Sistema, the results are calculated and displayed instantly.

A practical advantage for the user is that any parameter change is reflected immediately on the user interface with its impact upon the entire system. The time-consuming consultation of tables and calculation of formulae (calculation of the MTTFd by means of the parts count method, symmetrisation of the MTTFd for each channel, estimation of the DCavg, calculation of the PFH and PL, etc.), are performed by the software. This enables you to "play" with parameter values and thus to assess the global effect of modifications with a minimum of effort. The final results are printed out in a report. was launched specifically to deal with concerns regarding the recently introduced Machinery Directive and has become an increasingly popular point of reference for anyone wishing to access the latest information on machinery safety. In addition to the free Sistema download there are useful links and a wealth of information on products and standards. 

Contact Details and Archive...

Print this page | E-mail this page