Can another safety barrier be connected after a 1-in-2-out safety barrier?
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The analog input safety gate MTL5544D used in SIS is of one-input two-output type, with output signals in the 4-20mA range. So, from this card to the DCS, is a safety barrier still required on the DCS side? Are there any regulations regarding this?
There’s no need to connect anything further; it’s sufficient as long as the output wires of your 1-to-2 safety barrier are in the safe area. If they’re not in that area, then having a safety barrier in addition to the DCS is useless, and other explosion-proof solutions need to be considered.