hecateh

NX safety hardware - PFD average values

6 posts in this topic

Hi All, I have been asked to look for safety values for the NX Safety range from omron, I was able to find the PFH(d) values and the SFF but our process requires values for PFD(avg) due to the requirement of being a low demand mode system. I have been in contact with our local omron safety rep and they seem unable or unwilling to tell us these values, does anyone know where I can find them? Thank in advance!

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I'm not a safety expert but wouldn't the PFD apply to the design of the system including devices, configuration, circuit design and programming?

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I understood it as each component has a PFH(d) or PFD(avg) value which is then used to calculate the entire system value to determine the SIL or PL. But I cant be sure as I am also not an expert on safety!

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Wouldn't achieving a SIL level certification (most of Omron's safety stuff is Cat4/SIL3 certified) place the hardware in a certain PFD/MTBF category?

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Omron only publishes the PFH numbers.  They are in the manuals.

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That's what we suspected. Thanks for your help

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