Random arc signal lost
08 Sep 2020 14:11 #181289
by snowgoer540
I thought 7i96's used Pull up resistors. In that diagram, I believe the 4.7k resistor is a pull down resistor, which takes me back to some of my confusion in the beginning of this thread.
Either way, early on you said you used a 1k ohm resistor from the input to the field power ground (which matches your diagram above). Assuming the board resistor actually does match what you drew, that would give you 824.56 ohms, and assuming a 24 volt system, you've presumably only been pulling 29mA this whole time (71mA below the recommended min value).
Replied by snowgoer540 on topic Random arc signal lost
So here is the circuit diagram. You can see that the 7i96 is unaffected. It still draws its 5 mA and the 3 x 270 ohm resistors take 267 mA
So this becomes my weekend project. To bring my existing circuit in line with the Jury's recommendations.
I thought 7i96's used Pull up resistors. In that diagram, I believe the 4.7k resistor is a pull down resistor, which takes me back to some of my confusion in the beginning of this thread.
Either way, early on you said you used a 1k ohm resistor from the input to the field power ground (which matches your diagram above). Assuming the board resistor actually does match what you drew, that would give you 824.56 ohms, and assuming a 24 volt system, you've presumably only been pulling 29mA this whole time (71mA below the recommended min value).
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08 Sep 2020 14:27 - 08 Sep 2020 14:34 #181290
by Aciera
[edit]
So the above schematics discussed would assume that the common pin of the 7i96 isolated Inputs is connected to ground. If one were to use Field Power as the common then the schematic would look different. (but then the relay contact would be connected to Ground and not 24V)
Replied by Aciera on topic Random arc signal lost
[edit]
So the above schematics discussed would assume that the common pin of the 7i96 isolated Inputs is connected to ground. If one were to use Field Power as the common then the schematic would look different. (but then the relay contact would be connected to Ground and not 24V)
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08 Sep 2020 23:58 #181340
by phillc54
Replied by phillc54 on topic Random arc signal lost
Yes, as described in this extract from OmronAh, I think Operate and Release time are referring to the time required for the magnetic field to build up and deplete. So this is a delay between the change of the electrical signal to the coil and the mechanical movement of the contact.
Contact bounce happens when the contacts actually make contact or separate.
Warning: Spoiler!
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09 Sep 2020 00:13 #181346
by snowgoer540
Oh, I thought you could see them as a Moderator. My apologies!
Thanks!
Replied by snowgoer540 on topic Random arc signal lost
I could if I new your email address. Mine is a gmail address and it begins with phillcarter54Phill, would you be able to shoot me an email? I'll need to be able to communicate the doc edits to you at some point, and I have something else to send your way.
Edit: Oops, I meant to post this in the Feature Request thread.
Oh, I thought you could see them as a Moderator. My apologies!
Thanks!
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