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Technical Overview of the S7-200 Analog Combo Module
The Siemens 6ES7235-0KD21-0XA0 input/output module combines analog inputs and outputs in a single unit for the SIMATIC S7-200 system. This module captures four analog signals from sensors and provides one analog output for actuator control. Its integrated design saves valuable panel space. The module also features high-resolution measurement for precise process control. Consequently, this combo module offers a cost-effective solution for mixed analog applications.
Key Technical Specifications
| Specification | Details |
|---|---|
| Manufacturer | Siemens |
| Model Number | 6ES7235-0KD21-0XA0 |
| Product Type | Analog Input/Output Module |
| Compatible System | SIMATIC S7-200 |
| Analog Inputs | 4 (single-ended or differential) |
| Input Resolution | 12-bit (0–10V, 0–20mA, 4–20mA selectable) |
| Input Impedance | ≥ 10 MΩ (voltage) / 250 Ω (current) |
| Analog Outputs | 1 (0–10V or 0–20mA) |
| Output Resolution | 12-bit |
| Conversion Time | Approx. 2 ms per channel |
| Galvanic Isolation | None (non-isolated) |
| Power Supply | 24 VDC (from backplane) |
| Current Consumption | Approx. 80 mA |
| Operating Temperature | 0°C to +55°C |
| Dimensions (W x H x D) | 71.2 mm x 80 mm x 62 mm |
| Weight | Approximately 0.15 kg |
| Protection Class | IP20 |
| Certifications | CE, UL, CSA |
Functional Capabilities and Design Features
This module accepts four analog inputs with software-configurable ranges for voltage or current signals. Its single analog output drives actuators directly without additional converters. The module also features a built-in diagnostic LED for status monitoring. Furthermore, the 12-bit resolution ensures accurate data acquisition for demanding process loops. Therefore, this I/O module provides reliable analog handling for small-scale automation systems.
Engineering and Application Context
The Siemens 6ES7235-0KD21-0XA0 connects directly to the S7-200 expander bus. Engineers configure the input ranges using STEP 7 Micro/WIN software. The module’s compact footprint allows flexible placement in control cabinets. Ultimately, this combo module delivers both input and output functionality in one economical package.