What are the differences between the start signal, stop signal, and operation signal in the instrument electrical wiring cabinet?
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The last edit to this post was made by Yangfan Yuanhang2008 on 2012-11-9 at 21:42. What are the differences between the start signal, stop signal, and operation signal in instrument electrical wiring cabinets? How to make measurements with a multimeter?
Digital input and output – you mentioned stop, start, run; these are switch-type signals, right? What about a multimeter? Disconnect the common line and measure the on/off point
Be careful, it has a control voltage
What are the differences between the start signal, stop signal, and operation signal in the instrument electrical wiring cabinet? How to conduct measurements using a multimeter: The start signal is a digital signal. At the electrical end, use a multimeter to measure the 220V voltage; if there is voltage, the circuit is open, and if there is no voltage, it is closed. Be careful as there may be electricity present. The operation signal is the control wire that runs from the instrument control cabinet to the electrical cabinet, and it is connected to the auxiliary contacts of the contactors in the electrical cabinet. Under normal conditions, this voltage is 24V+, though 220V can also occur, but this is less common. It depends on the system – PLCs usually have this feature, while DCS systems almost never do! ! !