6/16/2018 8:06 AM | |
Joined: 11/29/2011 Last visit: 4/24/2024 Posts: 1354 Rating: (229) |
Hi, Could you show a picture of this spikes? It is hard to say what it might be without looking at the disturbance. Do you have trend or something? Is it only happening on one channel or all in the same time? Anyways voltage loops are sensitive for noise. Check for general grounding, shielding issues. Cross check your wireing aginst the SIMATIC S7-300 S7-300 Module data on the page 330. If all else fails, you can reduce noise sensitivity by "Interference frequency suppression" or you can apply "noise" suppression in code. If you coding standard allow these solutions. If you have any further question please let us known! |
- What you read here, please check with manuals and your requirements. |
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6/18/2018 10:04 PM | |
Joined: 11/29/2011 Last visit: 4/24/2024 Posts: 1354 Rating: (229) |
Hi, I think you are thinking to right way. Terminal 10-11. If you see the SIMATIC S7-300 S7-300 Module data on the page 354 ( the voltage measurement for 6ES7331-7KF02-0AB0). Terminal 10-11 is external compensation.If you see the drawing the terminals 3,5,7... should be connected to terminal 10&11. Maybe that is why disturbance come in. Based on the trend it seems like external disturbance. It seem to last 1 sec and the value is almost straight line. To think ahead, I would enable the diagnostic interrupt on the and keep checking Diagnostic buffer entries for this address. I do not think it is the IO card, but cost nothing to keep an eye on it. |
- What you read here, please check with manuals and your requirements. |
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