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NPN or PNP

Created by: rm07uq at: 12/14/2013 10:31 PM (6 Replies)

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12/14/2013 10:31 PM	Rate (0)
rm07uq Posts: 17 Rating: (0)	hello everyone, i guess i will require value input on this one also... i will have a pressure switch and would like to use its (2 x digital outputs).... the circuit of the pressure switch is attached within... would like the digital outputs from the pressure switch to trigger an output via logo... therefore 1) i connection each digital output from pressure switch into my logo input..Right?? 2) "load" as shown in the picture is my logo input..?? which one would be appropriate..NPN or PNP... Iam thinking NPN.. Maestros... pls help... thank you.. Attachment NPN OR PNP.jpg (623 Downloads)
rm07uq Posts: 17 Rating: (0)
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12/15/2013 8:38 AM	Rate (0)
Toeternietoe Platinum Member Joined: 12/27/2006 Last visit: 11/17/2025 Posts: 1200 Rating: (116)	Use PNP, then you can directly connect tthe output of the switch to the input of a logo. Notice, you needa logo with powerd by the same power as the pressureswitch. I think al the things are 24VDC, so your logo must by a 24 VDC type Your pressure switsch has also an 4-20 mA Output? Buy a LOGO! AM2 extensionunit, then you can connect that signal to your LOGO! and use the signal for displaying the pressure en use the LOGO as a swischt for a lot of thinks lika In/Out pomp Alarm Hih and Low pressue etc
	Last edited by: Toeternietoe at: 12/15/2013 8:58 AM
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12/15/2013 11:47 AM	Rate (0)
rm07uq Posts: 17 Rating: (0)	thank you, iam glad i asked... will buy the PNP version.. yes you are right my logo is 12/24 RCo. will connect the pressure switch to the same power block. i bought 2 DM8 ext units... thought of using the 2 x digital outputs from pressure switch to triger events in logo...
rm07uq Posts: 17 Rating: (0)
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12/15/2013 12:56 PM	Rate (0)
Toeternietoe Platinum Member Joined: 12/27/2006 Last visit: 11/17/2025 Posts: 1200 Rating: (116)	Yes, but you can do more. Use one of the inputs of the LOGO as a anolg input. P.E. use I7 as an analog input. You can connect it directly, but need a resistor of 500 Ohm. Connect the analog output of the sensor to I7 (or i8). Connect the resistor 500 Om between the Analog input (i7) and de - of teh power. Then the output snsor 4 - 20 mA becomes an analog value in the LOGO van 2 - 10 Volt. That signal you can use to display and switching.

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12/15/2013 2:58 PM	Rate (0)
rm07uq Posts: 17 Rating: (0)	Great, knowledge...now you have me more curious on analogs...which you understand for a common person like me dont understand that language.... hmmm..iam thinking what else i can use this good output...something really imp... cool i will keep u posted... sure enough i will have more questions once i fire up my logo for real...still waiting for the usb cable...
rm07uq Posts: 17 Rating: (0)
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12/15/2013 2:58 PM	Rate (0)
rm07uq Posts: 17 Rating: (0)	Great, knowledge...now you have me more curious on analogs...which you understand for a common person like me dont understand that language.... hmmm..iam thinking what else i can use this good output...something really imp... cool i will keep u posted... sure enough i will have more questions once i fire up my logo for real...still waiting for the usb cable... thank you...
rm07uq Posts: 17 Rating: (0)
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12/15/2013 4:21 PM	Rate (0)
Toeternietoe Platinum Member Joined: 12/27/2006 Last visit: 11/17/2025 Posts: 1200 Rating: (116)	Look in the attachment. A simple programm. Start en Stop Pump High Pessure Alarm Low Pressure Alarm Textindication. And you can do a lot more with the LOGO!, this is only the beginn Attachment Analog123.zip (329 Downloads)

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