uses
..., pingsend;
...
var
Ping: TPINGSend;
Begin
...
Ping := TPINGSend.Create;
try
Ping.Timeout := 500;
if Ping.Ping('192.168.1.1') = True then
begin
// Tutto OK
...
end
else
begin
// Ping fallito!
...
end;
finally
Ping.Free;
end;