Hello, I am experiencing an issue with a PLC S5 that is currently running on RAM. After transferring the program to EPROM using a PG, the PLC is not functioning properly with the EPROM. However, when I switch back to RAM and transfer the program, the PLC runs smoothly. This issue persists even when using a different EPROM. Can you please assist me in troubleshooting this problem? Thank you. - Habibi
To effectively transfer the program from EPROM to RAM, follow a specific sequence that involves flipping to stop, holding down the overall reset, and toggling between stop and run a few times. This method compels the PLC to load the program from EPROM. If unsure, rest assured that the Siemens technicians will be arriving shortly to provide the correct sequence. Don't worry, help is on the way! :nodi:-Eric
To reload the program from the EEPROM, follow these steps: Place the CPU in stop mode, press and hold the 'default/overall reset' button to the 'off' position, toggle the CPU selector switch from 'ST' to 'RN' twice, and observe the stop LED briefly turning off. Release the overall reset switch to complete the overall reset and have the CPU re-read the program from the EEPROM. - Paul.
To determine why the interrupt register is not functioning, investigate the sequence: Test, Output PLC information, Istack, and < or > (or zero instructions in a PC). Frequently, the program requires designated DB areas in the RAM.
To prevent any potential issues on your CPU, it is recommended to follow these steps provided by Eric Nelson and PLucas: first, switch to stop mode, then press and hold the overall reset button while toggling between stop and run modes multiple times. These simple actions can help improve your CPU's performance. It's amazing what a good memory can do! -Eric
From my memory 10 years ago, I recall that the various S5 models have specific procedures for resetting the memory. For instance, the 95U model simply requires shutting down, inserting the EPROM, removing the battery, waiting a minute, and then powering up (without the battery). When the red LED flashes rapidly, it indicates the EPROM is being read, and you can then reinsert the battery. The steps shared by Eric and Paul are more suited for the 115U (and possibly the 135U). Additionally, what I have described also applies to the S5-100U series.
Hi Habibi, it looks like you could be facing a communication issue between the EPROM and PLC. It might be that the transferred program has not been written properly in the EPROM or it's not being read correctly by the PLC. Try carefully cleaning the contacts of the EPROM or consider using a diagnostic tool to check for potential errors. An important point is also to always make sure your PLC system's firmware version is compatible with the EPROM as well.
Hey Habibi, it sounds like you're dealing with a tricky issue. Just to confirm, when you say the PLC isn't functioning properly with the EPROM, could you elaborate on the specific problems you're encountering? It's possible that there could be a compatibility issue, as not all PLCs and PGs play nice with each other. Additionally, double-check if your PG-PLC communication settings are correct when transferring to EPROM. Also, consider checking for any available firmware updates for your PLC or PG. All these factors could potentially influence the performance. Let's start from here and see how we can further narrow down the issue!
Hey Habibi, it sounds like you might be dealing with a discrepancy between how your PLC S5 operates on RAM vs EPROM. You've ruled out the EPROM chip as a factor since the issue persists with a different EPROM. I suggest checking whether the transfer process from the PG to the EPROM is successful and complete. Also, check the EPROM programming parameters - could be as simple as an incorrect setting. Additionally, see if there's a difference between the processing speeds of RAM and EPROM, it might be causing some timing issues. Hope this helps.
Hey Habibi, it sounds frustrating to deal with that issue! Since the program runs fine in RAM but not in EPROM, have you checked if the EPROM is properly formatted and if it’s compatible with your PLC model? Sometimes, the problem can also arise from the way the program is being transferred. You might want to ensure that the transfer settings are correct and perhaps try a different programming cable if you have one. If everything else looks good, running a memory test on the EPROM could reveal if there’s a hardware fault. Good luck with it!
Hi Habibi, it sounds like you’ve done a good job of isolating the issue. One thing to check is whether the EPROM is properly programmed and verified after it’s written; sometimes, verification can fail without an obvious error in the programming process. Also, ensure that there’s no issue with the compatibility between the EPROM and your PLC model. Additionally, consider whether the power supply is stable when switching to EPROM, as voltage fluctuations can lead to operational problems. It might also help to look for any unusual error codes or indications when the PLC tries to read the EPROM. Good luck, and I hope you can get it sorted soon!
✅ Work Order Management
✅ Asset Tracking
✅ Preventive Maintenance
✅ Inspection Report
We have received your information. We will share Schedule Demo details on your Mail Id.
Answer: 1. Q: Why is my PLC S5 not functioning properly after transferring the program to EPROM? The issue could be related to the EPROM storage or the transfer process. Troubleshooting steps may include verifying the EPROM compatibility, checking for transfer errors, and examining the EPROM programming process.
Answer: The problem might not be specific to the EPROM itself but could be related to the EPROM programming procedure or compatibility with the PLC. It is advisable to investigate the EPROM programming steps and ensure compatibility with the PLC S5.
Answer: Troubleshooting steps may involve checking the EPROM programming settings, verifying the transfer process, ensuring compatibility with the PLC S5 model, and examining any error messages or indicators during operation.
Answer: Common issues may include compatibility issues between the EPROM and PLC S5, errors in the transfer process, incorrect programming settings, or issues with the EPROM storage itself. Troubleshooting should focus on identifying and addressing these potential problems.
Join hundreds of satisfied customers who have transformed their maintenance processes.
Sign up today and start optimizing your workflow.