Siemens 6ES7235-0KD22-0XA8 SIMATIC S7-200 CN Analog I/O EM 235

Combined Analog Input and Output Expansion Module

The Siemens 6ES7235-0KD22-0XA8 EM 235 analog module adds both input and output capabilities to the S7-200 CN system. This expansion unit features four analog inputs and one analog output in a single housing. Its compact design allows seamless integration with the CPU 224 and other S7-200 CN components. The module converts analog signals from sensors and transmits control outputs to actuators.

This module accepts analog input signals of ±10 V, 0-10 V, and 0-20 mA, accommodating various field devices. Its 12-bit resolution ensures accurate signal conversion for precise process control applications. The analog output provides either 0-10 V or 0-20 mA signals, driving proportional valves and similar equipment. The unit’s configuration switches allow users to set input ranges and formats easily.

Technical Specifications

The Siemens 6ES7235-0KD22-0XA8 simplifies system integration by combining both analog I/O functions in one module. Its 12-bit resolution captures subtle signal variations, enhancing measurement accuracy in critical applications. The module’s switch-selectable input ranges eliminate the need for external signal conditioners. Its fast conversion time of under 250 µs enables responsive closed-loop control. The EM 235 connects directly to the S7-200 CN backplane, requiring no special configuration tools. Users can scale analog values using simple math instructions within the CPU program. This module proves especially useful for temperature control, pressure monitoring, and speed regulation tasks. Its compact size fits well in small control cabinets with limited space. The unit’s robust isolation protects the CPU from electrical noise on field signals. Engineers appreciate this module’s versatility for mixed analog applications in a single package.