11/29/2022 12:22 PM | |
Joined: 11/16/2022 Last visit: 12/9/2022 Posts: 6 Rating:
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Hi. I am having trouble using a potentiometer on the Analog inputs on my 1215C AC/DC/Rly. this is the potentiometer I am using. I am using TIA Portal v17. please let me know for any reason (software or hardware) why I would be struggling to assign this a tag and see a value in my monitor table. Kind Regards, Liam |
11/29/2022 12:54 PM | |
Joined: 3/30/2020 Last visit: 8/30/2024 Posts: 4708 Rating:
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Information missing. * Wiring diagram? (Add material as ZIP file.) |
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11/29/2022 1:23 PM | |
Joined: 7/7/2010 Last visit: 8/30/2024 Posts: 15125 Rating:
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Using a voltmeter, does the voltage at the AI terminal(s) vary as the POT is rotated? If so, then you have not configured the hardware addresses as you have expected, or, the system defaults are not what you *think* they are. If the voltage is not varying at the terminals, you may have incorrectly wired up the POT, possibly reversing the power and tap connections. Be certain the analog input common (3M) and POT common are connected together - like on a DIN rail terminal - since it can be difficult to correctly squeeze multiple wires (with ferrules) into the S7-1200 terminals. Do not try to short cut this by avoiding terminals. Use more terminals to make your connections easier. It's very inexpensive compared to the frustration and time wasted trying to make it work otherwise.
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science guy |
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11/29/2022 2:29 PM | |
Joined: 8/13/2015 Last visit: 8/28/2024 Posts: 81 Rating:
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Easies way is to set analog input to Voltage 0-10V mode. Connect this potentiometer in series with additional resistor of 1.4K (this is hard to find so 1.5K would be OK). Connect between GND and +24V (additional resistor in 24V side). So you would get about 0 - 10V on potentiometer output. As 0_Einstein mentioned, it is a good thing to measure with multimeter do you have correct voltage on the potentiometer output. From software side - simple analog input example from help is fully enough. |
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