[Beckett]

As explained above, assign a variable for example

Код:

new Bankrob = 0;
CMD:robbank(playerid,params[]) // or whatever Command Processor are you using.
{
if(Bankrob = 0)
{
 // do your code when player can rob bank.
Bankrob = 1; // THIS IS THE MAIN!!!!
} else { SendClientMessage(playerid,-1,"The bank is already being robbed.");
}

That's just an example, sorry for not explaining enough im on my phone.