Functional safetyThe special features of pneumatics
Contactors are often used to control pneumatic valves that also perform safety functions in accordance with EN ISO 13849. In the course of the risk assessment, pitfalls can lurk in terms of functional safety that are not known from the electrical side.
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:12.0pt;mso-bidi-font-size:10.0pt;font-family:"Courier New";
mso-bidi-font-family:"Times New Roman""><i style="mso-bidi-font-style:normal"><span style="color:red"><o:p></o:p></span></i></span>Figure 1: <span style="font-size:12.0pt;mso-bidi-font-size:10.0pt;font-family:"Courier New";
mso-bidi-font-family:"Times New Roman"">The architecture for control category 3 relies on redundancy, diagnostics and fault detection to achieve greater reliability of the safety function.<i style="mso-bidi-font-style:normal"><o:p></o:p></i></span></p> © Rockwell Automation