I have a simple program that is constantly measuring and logging temperature data on a PLC. It runs fine, but if I want to power off the PLC, I stop the program, unplug it, and when I power it back on, it gets stuck booting up.
I have to remove the SD card for it to be able to boot up, and when it does it has factory reset itself.
I would appreciate advice on what might be going wrong and how to fix it!
Hello Erin
I would recommend that you factory reset the PLCnext and the SD card.
Make sure you are running a LTS firmware version 2024.0.9 or the latest 2025 version
Save a copy of your project before making any changes.
To reset the PLCnext
Power off the PLC.
Hold in the recessed reset button
Then apply power to the PLC.
Continue to hold the reset button for about 10 seconds after powering on.
The status LEDs should go yellow, and a reset sequence will begin.
I recommend using the latest 2025 firmware or the 2024.0.9 LTS
note 2025 will require some library updates if you used them.
AXC F 2152 - Controller - 2404267 | Phoenix Contact
Please try the latest 2025 or a 2024 version of PLCnext engineer
PLCNEXT ENGINEER - Programming software - 1046008 | Phoenix Contact
Download your program and test. If you’re still having problems, let me know.
Jeff at Phoenix Contact Canada
Hi Jeff,
I have factory reset the PLC several times. It also resets itself if it gets stuck booting up for too long.
The issue still persists.
I’m using 2025.0.2 for both PLCnext Engineer and the firmware.
Hello Erin </p>I would recommend that you factory reset the PLCnext and the SD card. </p>Make sure you are running a LTS firmware version 2024.0.9 or the latest 2025 version </p>Save a copy of your project before making any changes. </p>To reset the PLCnext </p>Power off the PLC. </p>Hold in the recessed reset button </p>Then apply power to the PLC. </p>Continue to hold the reset button for about 10 seconds after powering on. </p>The status LEDs should go yellow, and a reset sequence will begin. </p>I recommend using the latest 2025 firmware or the 2024.0.9 LTS</p>note 2025 will require some library updates if you used them. </p> [AXC F 2152 - Controller - 2404267 | Phoenix Contact</a></p>Please try the latest 2025 or a 2024 version of PLCnext engineer </p>[PLCNEXT ENGINEER - Programming software - 1046008 | Phoenix Contact</a></p>Download your program and test. If you’re still having problems, let me know. </p>Jeff at Phoenix Contact Canada</p>
Hi Jeff,
I have factory reset the PLC several times. It also resets itself if it gets stuck booting up for too long.
The issue still persists.
I’m using 2025.0.2 for both PLCnext Engineer and the firmware.
Can you access any of the controller, like the WBM when it hangs on startup? There might be something in the notifications but if you have to pull the SD card you won’t see it.
Same problem here, two PLCs stopped becase they dont boot. Both HW06 FW 2023.6
No boot, no ethernet link up, D led orange static (no flashing) and Boot led flashing 2 x / second. After some time, D led turns off by 2~3 seconds and turns ON again. This process repeats indefinitely
I have the same issue flgirardi mentioned. Is there any solution?
I done reset type 1 and then PLC worked. Now I can reach to Phoenix web GUI (WBM) .