Back to top Share via Share via... Twitter LinkedIn Facebook WhatsAppSend via e-MailPrintPermalink × Remote IO - How to Connect Siemens S7-1200/1500 ? There are 2 settings on the PLC that need to be changed in order to connect to your Siemens S7-1200 / 1500 PLCs and read data. These are; * As you can see in the photo below, you need to remove the “Optimized block access” option in all data blocks where you want to read data. * As you can see in the photo below, the option “Permit access with PUT / GET communication from remote partner” must be enabled for each CPU.