Question: Problem with Change/Boolean Change

Hello,

I am quite new on Maple and Maplesim. A co-worker and I are evaluating a demo version (Maple 18 with Maplesim 7) for a possible purchase in 2015. For the project my collegue and I are working on, we need to detect when a signal becomes zero in order to switch between two options. We were trying to do this using the "Change" or "Boolean Change" components (the difference between those two is not really clear to us). Correct me if I am wrong, but those components should detect when a boolean signal has a change in value (both rising or decreasing) and in that case the output should become TRUE, while otherwise is FALSE.

The problem is that the component work if a "Terminate" is connected, but the output is always FALSE in any other case.

At the bottom we are attaching a file with two very easy examples.

In the first one the input of the "Boolean Change" component is a "Boolean Pulse". We compared also the output of the "Change", "Rising Edge", and "Edge with Initial Value" components. We were expecting istantaneous pulse with frequency equal to that of the boolean pulse, or its half for the Edge block. On the contrary the output of all the components stays zero (thus FALSE) for the whole simulation.

The second example use the output of a "Greater Threshold" component to enter the "Boolean Change", whose output is used to trigger a "Switch", whose output is in turn used as an input for the "Greater Threshold" component. The expected result is to have the "Switch" output to alternate the two inputs, instead it keeps the second one (thus the input for the switch is always FALSE).
The feature we need is more similar to this second output, but we don't understand what we are doing wrong or if there is another way to do it.
Thank you in advance
Irene

test_change.msim

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