Vision & Samba PLC + HMI Controllers & VisiLogic Software
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Try to replace power supply to new another one from other brand. If IO present (SNAP or EX-A2X Expansion Adapter) - IO must be powered from the same power line. -
Hi everyone, I'm experiencing an issue with V700 PLC that I hope someone here can help with. Whenever there's a sudden power loss, the PLC doesn't reconnect or resume operation once the power is restored. This problem is causing significant downtime and disruption to our processes. Here are the details: Model: V700 PLC Issue: Fails to reconnect after sudden power loss Symptoms: After the power is restored, the PLC remains offline and doesn't resume normal operation. A manual restart is required to get it back online. Additional Information: When I manually restart the PLC, it reconnects immediately and operates normally until the next sudden power loss. Attempts to Fix: I've checked the power supply connections, ensured the firmware is up to date, and reviewed the PLC's settings, but nothing seems to resolve the issue. Has anyone else encountered a similar problem? If so, what steps did you take to fix it? Any advice or troubleshooting tips would be greatly appreciated! Thanks in advance for your help. -
find foto in my PC with corosion sample - the same mainboard V1040-V1210 in this topic you can see my Visilogic connection to V1040 PLC with beep and black screen
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Thank you, @kratmel, I was hoping you might see this and provide some of your expertise. These are all good suggestions and I'll check them out. By the way, this is an old PLC that I use on my test bench, so no worries about reliability if I do get it back in service. -
Some steps... Open the back cover by unscrewing the screws. Examine the board with a magnifying glass. Pay special attention to the transitions between the upper and lower layers of the board. Look for chemical corrosion. If it is, unfortunately, the PLC will have to be thrown into the trash. If there is clearly no corrosion... For the test, try to turn on the power by pressing your finger on the video chip, as far as I remember - it is manufactured by Epson - it is near the connector for the display cable. If the image appears on the screen - give the board to people who know how to reball for this chip. If nothing helps - try to connect through Visilogic - see what is visible in the identification of the PLC. That's probably all. Investigating power supply voltages and chips is for specialists from breaking computer electronics. However, after repair, such a PLC can only be used as a test sample on the table. P.S. I occasionally buy cheap PLCs with a cracked screen. They come in handy as a source of spare parts when corrosion occurs. This is a frequent phenomenon.
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