Wieland offers full support for safety-related machine control

Designed to provide developers and testers of safety-related machine controls with comprehensive support in the evaluation of safety, SISTEMA software is available for download from Wieland.

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.

Advantage for the user

“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,” states Wieland.

“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 adapt the parameter values and therefore assess the global effect of modifications with a minimum of effort. The final results are printed out in a report.”