Issues regarding the wiring of digital signals

2008-01-17View Original

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I currently have a pressure switch with dry contacts, whose contact rating is AC250V 5A/DC30V 5A. The location where it is installed is a non-explosion-proof area. My question is: can the signal from this location be connected directly to the DCS cards? Is relay isolation required?

Reply #22008-01-17

Dry contacts can be connected to DCS cards without any problems generally; most factories connect dry contacts in this way these days, without the need for relay isolation, and it’s fine even if the site is not a explosion-proof area.

Reply #32008-01-17

Connect directly, no isolation needed: lol :lol

Reply #42008-01-17

If it is confirmed that there is no interference from strong voltage signals, it can be connected directly.

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Issues regarding the wiring of digital signals

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