Hello,
The thing is that SIM work with events/trapsand not so for ping sweeps. By default SIM will create events for reachable/unreachable objects in SIM. For this specific type of events you can create a filter of events only containing the reachable/unreachable events. These are located under System Insight Manager Events. With this filter of events in combination of the collection of the objects you want to check you can create a Automatic Event Handling entry under Options > Events > Automatic Event Handling > New Task. Here you follow the steps.
Name the Taskname - PingCheck > Next
Select events collecion - choose the collection of events you need (choose use event attributes the i will specify) > Next
Where event type is Systems Insight Manager Events > select Reachable and Unreachable > Next.
Now select the collection that contains the objects that you want te receive the up/down events from > Next
Now select the Send e-mail option and fill in the email properties and if you want a time window.