Description

The Siemens CPU 1211C AC/DC/RLY is a compact yet powerful controller from the S7-1200 series, tailored for basic to moderately complex automation tasks, especially in environments where only AC power is available. Operating on a wide voltage range of 85–264 V AC, it eliminates the need for external DC power converters, making it highly suitable for field installations, small industrial panels, and commercial automation setups. This model includes 6 digital inputs and 4 relay-type digital outputs, allowing for flexible control of both AC and DC loads. The relay outputs are particularly advantageous when dealing with mixed-voltage applications or when switching inductive loads like solenoids, contactors, or signal lamps. Additionally, it features 2 analog voltage inputs for basic analog signal processing, such as reading sensor data or monitoring environmental variables. With a 50 KB user program memory and full integration into the TIA (Totally Integrated Automation) Portal, the CPU supports efficient logic design, data processing, and real-time communication. The built-in PROFINET interface ensures seamless connectivity with HMIs, SCADA systems, and other networked devices. Despite its compact size, the 1211C AC/DC/RLY supports expansion through signal boards and modules, allowing customization for varied I/O needs. It is especially well-suited for building automation, compact machinery, and utility monitoring applications where versatility, reliability, and cost-effectiveness are critical.