This has been tested on direct connections to newer PROFINET CPUs and Helmholz NetLINK PRO COMPACT and IBH units. Doing so opens up the controller for other access by other applications as well, so be aware of the security implications of doing this. In addition, you must "Enable GET/PUT Access" in the 1200/1500 controller in TIA Portal.
S7-1200 and S7-1500 CPU access requires access using "Slot 1" and you must disable optimized block access (in TIA portal) for the blocks you are using. NodeS7 is written entirely in Javascript, so no compiler installation is necessary on Windows, and deployment on other platforms (ARM, etc) should be no problem. "Bad" values are returned, and eventually the connection will be automatically restored. So if the connection is lost because the PLC is powered down or disconnected, you can continue to request data with no other action necessary. So a request for 100 different bits, all close (but not necessarily completely contiguous) will be grouped in one single request to the PLC, with no additional direction from the user. It is optimized in three ways - It sorts a large number of items being requested from the PLC and decides what overall data areas to request, then it groups multiple small requests together in a single packet or number of packets up to the maximum length the PLC supports, then it sends multiple packets at once, for maximum speed.
If this could injure someone or worse, consider other software. In situations where writing to a random area of memory within the PLC could cost you money, back up your data and test this really well.
This software is not affiliated with Siemens in any way, nor am I. NodeS7 is a library that allows communication to S7-300/400/1200/1500 PLCs using the Siemens S7 Ethernet protocol RFC1006.
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