[Beckett]

You answered your own question.

pawn Код:

if(IsPlayerAdmin(changethistoyourTARGETvariable)) return 0;

Here I'll make you a quick CMD.

pawn Код:

CMD:ban(playerid,params[])
{
    if(IsPlayerAdmin(playerid))
    {
        new target;
        if(sscanf(params,"u",target)) return SendClientMessage(playerid,-1,"/ban id/partofname"); // Checking if the TARGET is a valid player.
        if(!IsPlayerConnected(target)) return 0; // If the target isn't online this command will stop.
        if(IsPlayerAdmin(target)) return SendClientMessage(playerid,-1,"You can't ban an RCON administrator."); // If the entered ID is an RCON logged in admin you can't ban him.
        if(target == playerid) return SendClientMessage(playerid,-1,"You can't ban yourself.");
        Ban(target);
    }
}

If I am missed something I am sorry as I said it's a quick CMD.