Hello everyone! I am a new member seeking assistance with testing a flasher unit using a PLC. The challenge I am facing involves a 12v+ constant input signal that changes to a 2hz pulse when the flasher unit detects a pulse signal. My goal is for the PLC to detect the 12v constant signal for a 3-second period, send a pulsed output, and then verify the pulses are being replicated by reading the input signal. I hope this explanation is clear, and I appreciate any assistance provided. Thank you in advance for your help.
The PLC program operates in one of two states: 1) Waiting for an input memory bit to remain at 1 for 3 seconds (indicating a consistent 12V physical input signal) before sending a pulsed output at 2Hz with a 50% duty cycle, and verifying if the input memory bit follows the output pulse. Is this correct? Assuming it is, are there any other inputs, outputs, or behaviors to consider? For example, when to initiate or reset state 1, possibly using a reset button. In state 2, how can we determine if the input is tracking the pulsed output? If the input deviates or ceases to follow the pulsed output for a period but then resumes tracking, should the failure indicator be reset? Are you seeking suggestions or actual code for this task? Is this related to a school assignment?
Hello, the idea of adding a 3-second delay to the input to verify its signal strength makes perfect sense. I was considering using a status message on the PLC to determine the output. Any advice is greatly appreciated, as I am new to PLC programming and feeling stuck. Thank you.
Hey there! It sounds like an interesting project you’ve got going on. To tackle the 12v constant signal detection, you could use a timer on your PLC to measure the duration of the constant signal. Once it hits that 3-second mark, you can trigger an output for your pulsed signal. For the verification part, using a comparator or an input monitoring function on your PLC to read back the pulse input should help you confirm that the flasher is replicating the output correctly. Don't forget to include debounce logic if the input signal gets noisy! Good luck, and feel free to ask more questions as you progress!
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Answer: 1. How can I convert a 12v constant input signal to a 2hz pulse using a PLC? - One way to achieve this is by programming the PLC to detect the 12v constant signal for a specified duration and then generate a 2hz pulsed output signal based on the detection.
Answer: - You can verify the accuracy of the pulse signal replication by setting up the PLC to read the input signal after sending the pulsed output and confirming that it matches the expected behavior.
Answer: - It is important to understand the voltage requirements, timing specifications, and programming capabilities of the PLC to effectively test the flasher unit. Additionally, ensuring proper wiring and signal conditioning is essential for accurate testing.
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