Illegal rate transition while trying to normalize signal in simulink

Question

I have a signal in simulink which I want to normalize so that the highest value of the signal is always 1. So I use a MaxRunningResettable-Block to remember the highest value that passed so far. I then divide the signal by that value.

A little test with a signal generation block, the running resettable block, the divide block and a scope runs just fine. But when I add this normalizing function to my simulink model I get an error: "Model initialization failed - Illegal rate transition found involving Unit Delay"

I don't even need to connect the little test case to my other model. Simply by putting it into my model I get this error. Strangely the RunningResettable-block turns yellow when I copy it - indicating that it has a different sampling rate I suppose. I don't get why this happens. I already tried to add a zero-order-hold-block behind the RunningResettable but that didn't help.

As suggest I tried to add another constant block to the R-input of the RunningResettable-Block. I tried several sampling frequencies for that Block (-1, 0, 1/fAb) but that didn't help.

Answer 1

Ok, finally I think that I found my failure. It seems, that the SignalGenerator outputs a continous signal (black). Because in my model there are mostly discrete signals this somehow causes errors. So when I simply add an zero-order-hold block after the signal generator everything seems to work just fine. The sampling frequency of the zero-order-hold has to be adjusted to the rest of the system.