I would like to ask what signal type should be used for the alarm light
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I have an alarm light on my end; it’s used to determine the type of signal it sends. This alarm light operates on a 2-wire system, with a working voltage of DC 24V. One of the wires is connected to 0V, while the other is connected to 24V; a normally open contact is connected to this second wire, and it starts working when that contact is closed. Its operating principle is similar to that of a solenoid valve. So, when filling out the form, how should I indicate the “signal type” for this alarm light? For example, the limit switch on a butterfly valve – if it is a mechanical microswitch – its signal type is “passive dry contact””
The signal type of the alarm light can be described as “DC power driven”. .
Is this point under DCS control? Where the power source comes from is relative – fate is not absolute! If it is DCS-controlled, and the DCS provides a DC 24V power supply with wired wet contacts defined in the IO point list, then if external power supply is used for DCS control, there are no wired dry contacts in the IO point list.