Codesys Persistent Variables

CODESYS
1

Hi everyone,

I’m trying to declare several setpoint variables as persistent so they’ll retain their values after a power loss.

I’ve used the PERSISTENT and RETAIN keywords in the variable declarations. These variables correctly hold their values through warm and cold resets in the CODESYS IDE, but when I physically remove power from the controller and plug it back in, they all revert to zero.

I’ve already created a Persistent Variables object and mapped the instance paths to my variables. I also tried implementing the Persistence Manager module to handle them, but when I did, the controller became unreachable after deployment and required a factory reset.

Has anyone successfully gotten persistent variables to survive a full power cycle on a groov RIO running CODESYS 3.5.20.10?
Is there a recommended approach (or configuration setting) to make these values truly nonvolatile?

Any insight would be greatly appreciated.

Thanks,
Jon

2

The groov RIO does not have the battery backed NV RAM, so it does not support persistence. If you need variables to be persistent on a power cycle you would need to use the EPIC. You could potentially use the Recipe Manager to store data on the RIO using Codesys.