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The following is an example of a Logic-And gate using two spst switches:

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What is the most common schematic to show a logic-and gate (without the symbol itself)? I have come across various schematics showing input nodes A and B (with nothing connected to it), but I'm not sure how those would be shown in a schematic to simulate the on/off states of those inputs. Additionally, how does one usually show that a logic gate's output is either in the On or Off position, or is this usually not done in a schematic (I've used an LED below but this is more to show myself that the and-operation is working correctly).

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  • \$\begingroup\$ Your question doesn't make sense. \$\endgroup\$
    – DKNguyen
    Feb 18 '20 at 21:54
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    \$\begingroup\$ Aaarrrgggh! Earth symbols should be pointing to the Earth. The symbol represents metal plates buried in the ground. \$\endgroup\$
    – Transistor
    Feb 18 '20 at 22:09
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What is the most common schematic to show a logic-and gate (without the symbol itself)?

enter image description here

Figure 1. Function Block Diagram (FBD) is popular in some PLC programming languages, with Germans particularly fond of it. Image source: Science Direct.

I have come across various schematics showing input nodes A and B (with nothing connected to it), but I'm not sure how those would be shown in a schematic to simulate the on/off states of those inputs.

I think we'd need an example from you.

Additionally, how does one usually show that a logic gate's output is either in the On or Off position, ...

enter image description here

Figure 2. Siemens LOGO! program status monitoring. (Click for full-scale view.) Image source: Treffpunkt Eltern.

In this example logic status is indicated by colour.

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