Help needed: I encountered logic control questions in the skills test and don’t know how to tackle them I hope fellow forum members can give me some advice! Thank you
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This post was last edited by The past is like the wind_IJNB on 2017-8-28 at 12:45. As the title suggests, please give your advice! Thank you so much! Thank you! ! It is required to implement the logic shown in the figure using electrical components such as relays, light bulbs, buttons, etc.!
Buttons and light bulbs are merely analog inputs and outputs; the program must be written in a PLC/DCS or integrated into a relay circuit for control.
The first diagram represents inverse logic, while the second diagram shows normal logic; everything else is the same. Silencing actually corresponds to resetting the audio system, and interlock disconnection functions as a bypass
Thank you! It uses a relay! But how exactly should the wires be connected?
I have no idea; could you be more specific? Thank you
It seems the chain operation light was renamed to chain removal
Which unit does the poster belong to? Is a technician taking this exam?
The main challenge is the 2-out-of-3 circuit; the rest can be connected simply. For the 2-out-of-3 circuit, use three two-channel relays connected in pairs, and then combine those three groups together
This post was last edited by Instrument Elite on 2017-8-21 at 17:58. The two diagrams differ in only three aspects; one shows the device operating at 0, while the other shows it operating at 1. Adding a NAND gate will resolve this issue. If the question setter intended to include both positive logic and negative logic, then there is a problem with the question; but if it’s just meant as a test, then there’s no issue. I’ve drawn a diagram here, which is the second one; take a look and please point out any mistakes