RS and SR Block in 800xA
Please help me to choose the right block for my safety logic. In my case an emergency shutdown valve(fail close) is in open condition during process,and during in abnormal condition the valve have to be closed. guide me to choose the functional block
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SR Flip flop is that having priority with respect to S(Set Pin). RS Flip flop is that having priority with respect to R(Reset Pin). Choose as per this for your logic requirements.
The RS in the last state with both inputs in 1, the output is false,
the SR in the last state with both inputs in 1, the out is TRUE. it depends of your valve command to be close,
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