_CurrentTime not incrementing/Controller clock stuck at 1-1-1970

[Winfield 0]

Hello,

I have a Sysmac project that contains two NJ controllers and an NA HMI. I am writing the current time to different variables upon completion of certain actions using the system variable _CurrentTime. 

I noticed that one controller was logging the date as 1-1-1970, and went to sync the clock with my computer's clock via the Controller-> Controller Clock... menu. 

Upon synchronizing and applying, the controller clock very briefly displays the correct time, and then reverts to 1-1-1970. I went to the second controller in the project, which simply had the wrong time zone setting, and attempted to change the time zone and apply. Whereas before it showed the correct time for the time zone setting, it now reverts constantly to 1-1-1970 as well. When I go online, I've also noticed the _CurrentTime variable is not incrementing; it is always 1970-01-01-00:00:00.00.

The HMI displays the correct time, and I am considering creating a mapped tag that shares this time with the controllers, but was curious as to what could be causing me this issue. I am also aware that 1-1-1970 is the unix epoch.

Any insight?

Edited 1 Dec 2020 by Winfield
spelling error

[lostcontrol 21]

I am sure you would of checked, but is there anything writing/resetting the system clock using the 'SetTime' instruction?

[Crossbow 277]

Besides SetTime instruction, check in the Ethernet settings to see if it is logging into a network time server via NTP.  Maybe the time server is in error.

[JYG 9]

I recommand to you using NTP settings for all your equipments.

If no NTP server is available you can setup a computer (Windows 10 for example) with NTP server.