The Siemens 6ES7211-1HE40-0XB0 is an S7-1200 CPU with a 24 V DC supply, 1 Mbyte integrated memory, and an onboard OPC UA server—meaning it can hand data directly to a BMS or SCADA without a separate gateway. It also speaks Modbus TCP natively and supports PROFIBUS via the CM 1243-5 or CM 1242-5 modules, making it a practical choice for plants that mix Siemens and third-party gear.
Open connectivity, no gateway hack
Native OPC UA server (configured as client or server) eliminates the need for custom drivers in most automation architectures. For existing Modbus RTU or TCP field devices, the built-in Modbus TCP support folds them into the controller without add-on hardware. The connection budget reserves 10 OPC UA slots and 14 open user connections; total available connections top out at 64—enough for a medium-sized line without hitting limits. PROFIBUS integration requires a dedicated CM module—master or slave depending on network role—so factor that into panel layout if you have legacy drives or remote I/O on that bus.
Sizing and selection notes
The CPU operates over -40 to 70 °C and accepts an isolated 24 V DC supply (L+ minus 4 V DC minimum). Programming in LAD, FBD, or SCL is supported; forcing variables is also available for commissioning. The 1 Mbyte integrated memory covers program and data for most standalone or small-network applications—if that fills up, step to a 6ES7212 variant. Dimensions are 100 x 90 x 75 mm, with cULus and CE marks on file. No BR/PL/REACH/RoHS declarations are listed in this record, so verify with the factory if your compliance package requires them.