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Hi,
The IEC60079-11 specifies that "A routine test shall be carried out on each completed barrier to check correct operation of each barrier component and the resistance of any fuse. The use of removable links to allow this test shall be acceptable provided that intrinsic safety is maintained...
Re: can any one please say how built a ex-or gate by means o
a XOR b = (NOTa AND b) OR (NOTb AND a) ,this is what I know, but you can chek it again :)
about memory mapped I/O you can check here
https://en.wikipedia.org/wiki/Memory-mapped_IO
it's pretty straightforward
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