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This is getting off topic a bit, but...
I do not think our products hang up either. But it is a good practice to add a watchdog/interlock to protect things when the device is driving equipment in the "real" world.
Adding a charge pump interlock to enable the outputs works well. This is driven by a port pin that is toggled in the software loop. NOT a hardware timer. So, if the loop hangs up for any reason, the outputs are turned off, independently of what the processor ports are driving. This also ensues the outputs are off at startup. The same setup can reset the processor.
Some industrial applications are not very forgiving, and can even be dangerous if they run away.
Occasionally, folks hook things up wrong. Like, having 240V AC run into the 24VDC connector!!! Yes, I have seen that, more than once.
Also, in some sites, lightning strikes are fairly common, and it is pretty hard to protect from a direct hit.
Some interlock system can help there too.
I do not think our products hang up either. But it is a good practice to add a watchdog/interlock to protect things when the device is driving equipment in the "real" world.
Adding a charge pump interlock to enable the outputs works well. This is driven by a port pin that is toggled in the software loop. NOT a hardware timer. So, if the loop hangs up for any reason, the outputs are turned off, independently of what the processor ports are driving. This also ensues the outputs are off at startup. The same setup can reset the processor.
Some industrial applications are not very forgiving, and can even be dangerous if they run away.
Occasionally, folks hook things up wrong. Like, having 240V AC run into the 24VDC connector!!! Yes, I have seen that, more than once.
Also, in some sites, lightning strikes are fairly common, and it is pretty hard to protect from a direct hit.
Some interlock system can help there too.
