P
hi
Recently I came to know many DCS/PLC manufactures are coming with Intrinsically safe built-in AI/AO/DI/DO cards.
what is difference between this Built-in and
std.i/o card + external barrier.
if like i have an instrument or relay not certified for Intrinsically safe, but installed in hazardous area then can`t I use these Built-in cards.
somebody is telling me i can not use them and i have to use standard card with external barrier. but my question is how it makes difference between Bulit-in, std.i/o+external barrier.
hope somebody can help me
thanks
pandu
Recently I came to know many DCS/PLC manufactures are coming with Intrinsically safe built-in AI/AO/DI/DO cards.
what is difference between this Built-in and
std.i/o card + external barrier.
if like i have an instrument or relay not certified for Intrinsically safe, but installed in hazardous area then can`t I use these Built-in cards.
somebody is telling me i can not use them and i have to use standard card with external barrier. but my question is how it makes difference between Bulit-in, std.i/o+external barrier.
hope somebody can help me
thanks
pandu