Posted 17 Apr 2019 Hello! I am using S7-1200 PLC 1212C AC/DC with configured Modbus TCP Server. I can already read/write Inputs/Outputs (Coils) and Memory Words. However I'd like to read/write Memory BITS. Is it possible? If so, how? What addresses should I use in TIA portal? And which function codes on client side? Thanks in advance! Share this post Link to post Share on other sites
Posted 18 Apr 2019 Hello, To write and read in the memory bits, you have to address it in the following way .... modbus plc memory mw100 = mb100-mb101 memory tcp = 40001 then to write would be m101.0 and by the customer 40001.1 then to write would be m101.1 and on the part of the client 40001.2 and so on. Test and practice and tell us. a greeting. Share this post Link to post Share on other sites