dear,
i was looking at the internet for the meaning of 1oo2 and 2oo2,
"1oo2 safety system can handle 1 dangerous failure and 0 safe failure and a 2oo2 safety system can handle 0 dangerous failure and 1 safe failure."
i could understand that 1oo2 is a redundant system able to handle a dangerous failure (is it like physical failure? like one of the plc in a redundant plc system connected to redundant RIO's fails?)
if this happpens, i.e. a dangerous faiure occurs will 1oo2 becomes 2oo2 (if it is configured to do so?) and this will be called a safe failure? and what does safe failure means? is it when the system return to its safe state?
thanks!
charbel
i was looking at the internet for the meaning of 1oo2 and 2oo2,
"1oo2 safety system can handle 1 dangerous failure and 0 safe failure and a 2oo2 safety system can handle 0 dangerous failure and 1 safe failure."
i could understand that 1oo2 is a redundant system able to handle a dangerous failure (is it like physical failure? like one of the plc in a redundant plc system connected to redundant RIO's fails?)
if this happpens, i.e. a dangerous faiure occurs will 1oo2 becomes 2oo2 (if it is configured to do so?) and this will be called a safe failure? and what does safe failure means? is it when the system return to its safe state?
thanks!
charbel