7/6/2017 5:08 PM | |
Posts: 1 Rating: (0) |
Hello, Can someone please tell me about the S7-300 CPU I/O modules are internally pulled up or Pulled Down. I found problem with my bi directional level shifter 24vdc to 5Vdc that is connected to arduino nano and S7 plc. I used 4.7k pull up register for arduino at 5vcc and 100k pull up register at the plc side at 24vcc. I am using 2 output pins of PLC for red and green light that is connected to the inputs of ardunio nano. My program logic is to On/OFF for traffic light using Red and Green . When Red is on Green is turned off. If I checked voltage at the output pin of PLC it shows 24vdc for Red light it shows 0.008v. But when I connect this Red and Green light output signals of PLC to the input terminal of arduino. I record 24v for Red light and for Green light which is turned of but it shows some voltage around 2.008v. I am wonder my output pin of PLC draw voltage when i connect it to arduino. Did anyone have faced the same problem. Please suggest me what should I do in order to fix that problem. ------------------------------------------------------------------------------------------ |
Last edited by: Jen_Moderator at: 7/7/2017 11:29:07 AMNew subject after splitting |
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7/7/2017 7:57 AM | |
Posts: 8946 Rating: (999) |
use relais or optocouplers. |
Last edited by: IBN-Service at: 7/7/2017 7:57:33 AM |
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