There have been reports of the V5 controllers failing to generate a command (voltage) signal when the Loop is enabled on V5 Closed Loop controllers. The problem was also duplicated internally.

In general the issue was caused by the order that the ARM processor was processing data sent to it through the 386 processors timer interrupt. If the ARM processor received two or more data blocks prior to being able process them, they needed to be processed in the same order as the 386 send them and they weren’t. This will eliminate any processing order dependencies that may occur as a result.

Specifically the individual Loop Settings were getting processed before the initial Power up settings were getting processed. Until the initial Power up settings are configured, the individual Loop settings cannot be processed. The Loop gain and other settings were not getting set, which prevented the loop from generating a signal.