Posted 6 Feb 2019 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 Share this post Link to post Share on other sites
Posted 6 Feb 2019 Hi Nick. Welcome the forum :). I have a few initial thoughts. 1. Have you had to flash or update the firmware? 2. When you say you have "formatted" the MMC, how have you done this? 3. Can you establish communications with the PLC?, is so please check for any messages in the diagnostic buffer. Regards Daniel Share this post Link to post Share on other sites
Posted 6 Feb 2019 Hi Daniel The PLC has been flashed to v2.6 by the automation dept prior to being passed to me. The MMC was formatted in the PLC via TIA V15 online diagnostics. I can get online with no problem and the only diagnostic message is feeling me to put the mode selector in run. Which it is. Thanks Nick Share this post Link to post Share on other sites
Posted 6 Feb 2019 (edited) Okay. Could it be that the selector switch is broken? (I have seen before). I seem to recall on 1500 series there is a software selection also made possible through the CPU Screen? With or without any Blocks in the User Memory, it is normally possible to still select Run Mode. Edit: Glad to hear you haven't tried to format the MMC in Windows Regards Daniel Edited 6 Feb 2019 by collinsd70 Share this post Link to post Share on other sites
Posted 8 Feb 2019 Turns out the Italians I am working for borrowed it from a Siemens Rep so who knows it's history. I thought it was new. New one on the way. Thanks Anyway. Share this post Link to post Share on other sites
Posted 8 Feb 2019 Glad to hear you have a new one on the way. Make sure you come back to us if your facing the same issue. Regards Daniel Share this post Link to post Share on other sites