you don't need all those eval statements:

for ($i = 0; $i <= 16; ++$i)
{
$object_a = ("schalB_" + $i);


$object_b = "locator1" ;
select -add $object_b;

//commando
connectAttr -f "locator1.schalB" ($object_a + ".rotateZ");


}

this will work better


A