Description

The Siemens CPU 1212C AC/DC/RLY is a versatile and compact controller specifically designed for control systems that operate on AC mains power and require flexible output switching. Operating within a broad voltage input range of 85–264 V AC, it eliminates the need for external DC power supplies, making it ideal for field installations, standalone machinery, and infrastructure applications. This PLC features 8 digital inputs, 6 relay outputs capable of switching both AC and DC loads, and 2 analog inputs (0–10 V), providing a balanced combination of I/O for various types of signals. With a program memory of 75 KB and data memory of 50 KB, the CPU 1212C AC/DC/RLY supports mid-level control strategies, data handling, and time/event-based operations. It is fully integrated with Siemens’ TIA Portal engineering framework, simplifying configuration, diagnostics, and maintenance tasks. The built-in PROFINET interface allows seamless communication with HMIs, SCADA systems, and distributed I/O devices. Additionally, this controller supports modular expansion through signal boards and communication modules, offering up to 8 expansion modules for future scalability. The inclusion of relay outputs allows for direct switching of inductive or high-voltage loads without additional relays or interface circuitry, making it ideal for controlling motors, solenoid valves, lighting circuits, and contactors. Its compact size and rugged construction make it a preferred choice for OEMs, system integrators, and control panel designers involved in applications such as pump systems, HVAC control, and building automation.