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Search: Posts Made By: parky
Forum: LIVE PLC Questions And Answers September 27th, 2021, 02:35 AM
Replies: 18
Views: 1,586
Posted By parky
The resistance of those coils does not seem...

The resistance of those coils does not seem correct so I suspect that one of them is an AC relay, hence the low coil resistance, a 12v relay driven off 5 volts is not a good idea, the induced...
Forum: LIVE PLC Questions And Answers September 20th, 2021, 03:45 AM
Replies: 18
Views: 1,586
Posted By parky
DR is right, however, one or two points, the PLC...

DR is right, however, one or two points, the PLC is usually rated at between 5-10ma drawn current (will depend on how the circuit is configured, very often the input transistor & LED are driven...
Forum: LIVE PLC Questions And Answers September 15th, 2021, 02:07 PM
Replies: 18
Views: 1,586
Posted By parky
Yes, that makes more sense, just remember, if the...

Yes, that makes more sense, just remember, if the PLC is wired as 24v source then your logic will be opposite i.e. when the led is off the input to the PLC will be on, the average current drawn on...
Forum: LIVE PLC Questions And Answers September 15th, 2021, 08:34 AM
Replies: 18
Views: 1,586
Posted By parky
Only way to use an NPN transistor to drive the...

Only way to use an NPN transistor to drive the PLC input would to make the PLC input sinking and put everything in the collector, in other words, the transistor collector will sit at 24v when the...
Forum: LIVE PLC Questions And Answers September 14th, 2021, 12:48 PM
Replies: 18
Views: 1,586
Posted By parky
This circuit is probably irrelevant as the...

This circuit is probably irrelevant as the emitter connected to the PLC will probably not be enough to turn it on.
Forum: LIVE PLC Questions And Answers September 14th, 2021, 03:05 AM
Replies: 18
Views: 1,586
Posted By parky
First of all connecting the PLC input to the...

First of all connecting the PLC input to the emitter will not give enough voltage to the PLC to trigger the input, in simple terms the emitter in an NPN transistor will only have a difference of 0.5v...
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