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Check instant analog value LDR

Created by: farguis at: 10/10/2017 5:26 PM (4 Replies)

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10/10/2017 5:26 PM	Rate (0)
farguis Posts: 3 Rating: (0)	Hi, I have a problem with my logo config. I want to activate Q1 (output) when I have 1000K Ohmios in I7 throught one LDR. Also I want to desactivate Q1 when I have 20k ohmios in I7 (analog input). I don´t know how I can check the instant value in I7 for example. Could you help me please? Regards.
farguis Posts: 3 Rating: (0)
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10/10/2017 5:59 PM	Rate (1)
ixo65 Grandmaster-Expert Joined: 12/18/2014 Last visit: 11/4/2024 Posts: 34135 Rating: (4253)	The analog input of a basic module of LOGO! reads a voltage signal 0-10V and converts this to 0 to 1000 units. The analogue input can not directly detect resistance values. So you can not directly connect the LDR to the LOGO! and evaluate. In the attachment a circuit proposal with an LDR "A 1060". The values for switching thresholds must then be read either by voltage measurement or by reading the units of AI1 by online observation or on the display of the LOGO !. Attachment LOGO! LDR 24VDC connected to LOGO! on I7 (AI1).png (163 Downloads)

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This contribution was helpful to 2 thankful Users MOHSENM Diniz_

10/10/2017 6:12 PM	Rate (0)
ixo65 Grandmaster-Expert Joined: 12/18/2014 Last visit: 11/4/2024 Posts: 34135 Rating: (4253)	Here an example of the LOGO! programm. Attachment LDR_0BA8.Standard.zip (165 Downloads)
	Last edited by: ixo65 at: 10/10/2017 6:12:55 PM attachment
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This contribution was helpful to 2 thankful Users farguis MOHSENM

10/11/2017 8:34 AM	Rate (0)
farguis Posts: 3 Rating: (0)	Thanks! I will check your last schematic. Regards.
farguis Posts: 3 Rating: (0)
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This contribution was helpful to 2 thankful Users ixo65 MOHSENM

10/16/2017 10:48 AM	Rate (0)
farguis Posts: 3 Rating: (0)	Finally I fix my problem because I could read the instant value in the display when you select with the narrows. I tryed your schematic but I could see your new display in my logo, I don´t understan why. I could fix it, Thanks you very much. Regards..
farguis Posts: 3 Rating: (0)
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This contribution was helpful to 1 thankful Users ixo65

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