Why does my timer only run once in this case? After the initial use, the elapsed time remains at 0ms consistently. This issue is occurring within a Facebook (FB) environment.
I may need a bit of a refresher when it comes to Siemens programming, but I have a few questions to clarify. Is the -(p)- instruction triggered by a rising edge? Is S_ODT a type of on delay timer or an off delay timer? And does TV represent its setpoint? If (p) is a pulse lasting 1 scan and S_ODT functions as an on-delay timer, it will not complete unless the scan time exceeds 10 seconds. This is because #varpom will activate for one PLC scan, initiating T71. Before T71 reaches its timeout, the PLC scan will switch back to Network 2, detect that #varpom is "on", and then reset its RLO to 0, halting the timer. If S_ODT is actually an off-delay timer, your code should function correctly.
In short, the program logic dictates that the instruction only executes once. In more detail, it seems that the -(p)- instruction acts as a one-shot, while S_ODT functions as an On-Delay Timer. When the #pombit transitions from 0 to 1, the output rung of the -(p)- instruction becomes True for just one scan cycle. Subsequently, the timer is triggered and starts counting. During the following scan cycles, even though #pombit retains a value of 1, the -(p)- instruction output will be False as the one-shot already occurred. This leads to the timer being reset when the False output is detected. Consequently, the timer's output cannot become True, keeping the #pombit value at 1 and the timer in a reset state. As suggested by @joseph_e2, switching to an Off-Delay Timer could resolve the issue. Alternatively, eliminating the one-shot instruction would allow the S_ODT timer to continue timing until expiration, resetting the #pombit value to 0 and restarting the process. A more efficient approach might involve implementing the logic using a Start/Stop Circuit pattern instead of Set and Reset instructions. While Set and Reset instructions are functional, they can make the logic harder to comprehend and troubleshoot.
Thank you, I will give it a shot. Would it be possible for you to provide screenshots of those solutions? I have just recently begun using Step 7 within the last month.
Tomz expressed gratitude and mentioned he would give it a try. He also requested screenshots of the suggested solutions since he recently started using Step7. Is this related to schoolwork or a professional project? For @joseph_e2's solution, try removing the #(p)#varpominstruction and confirm if it works. The link in my previous post contains an image of the Start/Stop Circuit pattern. It may require some analysis to determine which elements to use for the Start, Stop, and Seal-In/Run components. I recommend watching a video series mentioned in the post to assist with this. If you are unfamiliar with the PLC scan cycle, consider watching a video series that explains 80% of what is needed to program PLCs in less than two hours.
Inquiring Minds Want to Know: Is this task for academic purposes or tangible job-related responsibilities? It's a learning experience in the field of work, navigating uncharted waters with limited experience. Despite the challenges, I successfully maneuvered through it. Grateful for the helpful responses!
It seems like your timer isn't being reset after its initial run. In a FB environment, certain codes run differently due to security mechanisms. Try diagnosing the issue by adding alert dialogs or console.logs after the point where the timer should reset. This can help you understand if your reset command is getting reached and executed properly. If the timer is not resetting, it would mean the elapsed time is not recalculated, thus, it remains at 0ms after the initial run.
It sounds like your timer might not be resetting correctly after each use. In many cases, timers will need to be specifically reset to start counting time from zero again after they've run once. Try applying a reset function after every run. A syntax error could also be at play here; double-check your code to ensure everything is correctly written. Don't forget that the FB environment might have different rules for timer operations if you're used to coding in a different context!
It sounds like your timer isn't being reset after its initial cycle. While timers inside a FB environment should work the same as anywhere else, I suspect that FB may be causing a hiccup due to asynchronous processes. Try directly resetting your timer after it runs, or consider using 'setInterval' instead of 'setTimeout'. These changes could resolve the issue.
It sounds like there might be an issue with how the timer is being reset or called in your code within the Facebook environment. Sometimes, timers can lose their reference if they’re not properly managed or if the context gets reset. Have you checked if the timer is being stopped or if there’s any conditional logic that’s preventing it from running a second time? Additionally, if you're using any asynchronous code, make sure your timer isn't being executed before the necessary states are set up properly.
It sounds like your timer might be getting reset or not being properly triggered after the first run, which can happen in specific environments like Facebook where certain properties or states may not persist as expected. Have you checked if the timer function is scoped correctly or if there are any event listeners that stop it? Sometimes, timers in JavaScript need to be explicitly restarted, especially in complex environments with multiple event cycles.
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Answer: 1. Why does my timer only run once in a Facebook environment? - The issue of the timer running only once in a Facebook environment could be due to limitations or restrictions imposed by the Facebook platform on certain scripts or functionalities. It's possible that there are constraints on continuous timer functions within the FB environment.
Answer: - To troubleshoot the timer issue in a Facebook environment, you can try testing the timer functionality outside of Facebook to determine if the issue is specific to the platform. Additionally, checking for any console errors or debugging tools provided by Facebook can help identify the root cause of the problem.
Answer: - One possible workaround for the timer issue in a Facebook environment could be to explore alternative timer implementations that are compatible with the platform. You can also consider reaching out to Facebook's developer support or community forums for insights on handling timers within their environment.
Answer: - Facebook may have specific guidelines or restrictions related to timers and dynamic content within apps or pages to ensure a smooth user experience and prevent potential misuse. It's advisable to review Facebook's developer documentation or guidelines for any information on using timers or time-based functionalities within their platform.
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