SAFETY PLC - SAFE STATE ???

P

Thread Starter

pan

Hi experts

I have question, (may be it is stupid question)

For SAFETY PLC where we define the which SAFE state it has attain?

I mean what exactly happens when SAFTEY PLC finds the input circuit is faulty?

with example, for some valves OPEN state is FAIL SAFE, for some it is CLOSE. in case of MCC contacts OPEN contact.

so these state to be defined in the SAFETY Program??

i did lot research to find and read lot papers, but...... HELP

Thanks
pan
 
Pan... NO, it is not a stupid question! If you like, I can send you a copy of one of my SIS papers, "Probabilistic Risk Assessment of Equipment Safety Systems!"

It does answer the Oxymoron, "Is Fail-Safe really Safe?

Regards, Phil Corso
 
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