PLC unexpected reboot

PLCnext Technology & PLCnext Controls
1

Hello, we have come across big problem: after the start of our new project we have controller reboot. So last messages from system: Jun 3 11:18:23 axcf2152 user.info ptusa[2112]: Starting main loop! Sleep time is 2 ms.

Jun 3 11:18:23 axcf2152 user.warn kernel: [ 501.674447] axc2152_wdt: axc2152_wdt_start called
Jun 3 11:18:23 axcf2152 user.info kernel: [ 750.618600] device eth0 left promiscuous mode
Jun 3 11:18:23 axcf2152 daemon.debug watchdog[2240]: still alive after 249 interval(s)
Jun 3 11:18:23 axcf2152 daemon.err watchdog[2240]: pinging process 2112 (/opt/plcnext/data/System/Watchdog/mainProcess.pid) gave errno = 3 = ‘No such process’
Jun 3 11:18:23 axcf2152 daemon.debug watchdog[2240]: Repair attempt 1 for /opt/plcnext/data/System/Watchdog/mainProcess.pid
Jun 3 11:18:23 axcf2152 daemon.alert watchdog[2240]: shutting down the system because of error 3 = ‘No such process’
Jun 3 11:18:23 axcf2152 daemon.err watchdog[2240]: /usr/lib/sendmail does not exist or is not executable (errno = 2) Firmware version 2019.9. Thanks a lot.

image.png
image.png755×505 73.3 KB

2

Hi Dzmitry, That issue is related to the new System Watchdog feature, and is discussed here: https://www.plcnext-community.net/en/discussions-2-offcanvas/unexpected-restart-during-stop-of-firmware.html (I thought that this was introduced with FW 2020.0, but I guess it was also in FW 2019.9). ~ Martin.

3

Hi Martin, According to https://www.plcnext-community.net/en/hn-makers-blog/440-how-to-disable-system-components-in-the-plc-for-more-performance.html I added the configuration file /opt/plcnext/appshome/Disable.acf.settings : … `EnvironmentVariable name=“ARP_SYSTEM_WATCHDOG_SUPPORT” value = “false” overridden=“true”``` … but after this PLCnext Runtime is not start, also no log messages presented. Could you help me? Thanks a lot.

4

Solved via email (root cause was a typo in the acf.settings file). A defect has been raised with the developers - hopefully we will get better (or at least some) error messages for similar problems in future. ~ Martin.