Help with TLP-2363 and Meeting IEC 61131-2 Type 1 Standards

• Help with TLP-2363 and Meeting IEC 61131-2 Type 1 Standards
  Posted by RitschRatsch on 05 May, 2024 18:33
• Hello everyone,
  I am currently experimenting with a TLP-2363 and have set up the circuit shown in the attachment.
  
  
  Brief explanation:
  
  I am using a function generator that produces a 30Hz sine wave (variable), but I only need the top half-wave.
  Afterwards, I amplify the signal to about 24V. Since I am using simple resistors and no potentiometer, it's only approximately 24V. Then, I pass the signal through a voltage divider into the TLP2363 and stabilize it afterwards with a Schmitt trigger.
  
  Now to my main question:
  You can see the switching points in the signal in the oscilloscope screenshot attached. The TLP-2363 should comply with the IEC 61131-2 Type 1 standard, so I thought it would switch to 1 at about 15V and to 0 at about 5V. However, as you can see, it switches at about 3V.
  
  
  How can I test whether the IEC 61131-2 Type 1 standard is being met?
  
  I suspect that the current has a similar profile to the frequency and that the diode is sufficiently supplied at 3V. Perhaps I have gotten a bit off track and hope you can help me out.
  
  Kind regards,
  Ritsch Ratsch
• #1 Reply
  Posted by RitschRatsch on 06 May, 2024 11:24
• So far, unfortunately, no one has been able to help me better understand the standard. Of course, I considered the datasheet when setting up the circuit and used this page for assistance:
  
  https://toshiba.semicon-storage.com/eu/semiconductor/product/isolators-solid-state-relays/photocouplers-for-high-speed-communication/articles/digital-io-design-for-industrial-plc.html
  
  Can someone explain how I can prove that a circuit complies with the standard?
  
  Kind regards
  Ritsch Ratsch
• #2 Reply
  Posted by aliarifat794 on 06 May, 2024 12:28
• Environmental factors such as temperature can also influence the performance of electronic components, so try to maintain a stable testing environment.
  
• #3 Reply
  Posted by RitschRatsch on 06 May, 2024 14:46
• Quote from: aliarifat794 on 06 May, 2024 12:28

  Environmental factors such as temperature can also influence the performance of electronic components, so try to maintain a stable testing environment.
  

  
  Thank you for your response. The conditions are stable. However, how can I test the limits to see if the standard is being met? Among other things, the standard states the following.
  
• #4 Reply
  Posted by Wolfram on 06 May, 2024 15:12
• The input threshold current of the TLP-2363 has a 8:1 spread according to the datasheet (0.3 - 2.4 mA). Meeting the spec of having a threshold of 5 - 15 mA (3:1 spread) is therefore not possible in the present configuration. If you put a comparator before the optocoupler, it's much simpler to define an accurate threshold for switching.
• #5 Reply
  Posted by JessieDee on 06 May, 2024 18:51
• To check compliance with the IEC-61131-2 type 1 input, you need to plot both input voltage and current as well as output of your schmitt trigger output on top of the V/I diagram. Output transition shall occur in the transition region under all conditions. In my opinion, it will be easier to connect an adjustable power supply to your input and vary it manually.