Description

The Siemens CPU 1211C DC/DC/RLY is a highly adaptable controller that brings together 24 V DC power operation with the versatility of relay outputs, offering a practical solution for systems that handle both DC logic and AC power control. Designed for compact automation scenarios, this model features 6 digital inputs, 4 relay outputs (suitable for switching both AC and DC loads), and 2 analog voltage inputs (0–10 V), making it ideal for handling diverse signal types within a single system. The inclusion of relay outputs allows for electrically isolated switching, which is essential when operating inductive loads, safety interlocks, or devices operating at higher voltages. This hybrid setup is particularly advantageous in environments such as HVAC systems, industrial automation panels, access control mechanisms, or factory equipment where DC control signals manage AC-driven devices. Equipped with 50 KB of user program memory and integrated PROFINET communication, the CPU 1211C DC/DC/RLY supports real-time data exchange, scalable programming in the TIA Portal, and seamless integration with HMIs, SCADA systems, and distributed I/O modules. Its compact footprint and expandable design (via signal boards and additional modules) make it a top choice for OEMs, panel builders, and integrators who need a cost-effective yet flexible PLC for small-scale automation projects.