Hello,
I am new to the forum so I hope you will be gentle 
I have an S7-1518-4 PN/DP plc and am having big issues with it.
It is new with a new 24mb MMC and I cannot get it to go into run at all. The MMC has been formatted and I have done a factory reset but even in this state the plc will not go into run as I would expect it to. Is there something I am missing or should it run? It’s almost as if the mode selector isn’t functioning as if I go on line the diagnostics tell me the switch is always in the stop position.
Thanks
Nick