If a+ and a- are untimed enabled concurrently but fire in a safe order,
there is still an error message that signal is enabled at the wrong value.
Temporary fix is to not fail if it is an input, but better fix would be
to be aware of the timed-enabledness of the event.
If a+ and a- are untimed enabled concurrently but fire in a safe order, there is still an error message that signal is enabled at the wrong value. Temporary fix is to not fail if it is an input, but better fix would be to be aware of the timed-enabledness of the event.