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Here is my idea. Please find the holes in it. We have plans to install distributed I/O (AB flex) in class1 division1 location. I can install my non-intrinsically safe devices in a purged panel and install it in the class1 div1 area. When the panel loses pressure the purge unit will disconnect the power source to the panel. So far so good. But my communication cable(profibus)is still powered. This is a problem. I know you can use Profibus-PA(intrinsically safe) but the I/O adaptor modules are not in themselves I.S. So
that is the reason I'm not using Profibus-PA.
Anyways my idea is to disconnect the communications via an electronic switch. The electronic switch is then swiched off via a relay to ensure no power exists. I don't want to switch the communications cable directly through the relay. It seems too crude ie contact bounce from the relay. IS THERE AN AVAILABLE ELECTRONIC SWITCH TO SWITCH OF THE PROFIBUS COMMUNICATIONS?
that is the reason I'm not using Profibus-PA.
Anyways my idea is to disconnect the communications via an electronic switch. The electronic switch is then swiched off via a relay to ensure no power exists. I don't want to switch the communications cable directly through the relay. It seems too crude ie contact bounce from the relay. IS THERE AN AVAILABLE ELECTRONIC SWITCH TO SWITCH OF THE PROFIBUS COMMUNICATIONS?