S7-200CN is a small controller launched by Siemens. It has flexible combination and customization functions, which can meet different application needs and budgets. S7-200CN has 5 CPU models, the maximum supports 24 digital inputs and 16 digital outputs, and has 2 built-in analog inputs and 1 analog output. S7-200CN can also expand digital input, digital output, analog input, analog output, position control, weighing, communication and other modules.
This guide covers the Siemens S7-200CN series of programmable logic controllers. It lists the available CPU variants (221, 222, 224, 224XP, 226) and their respective input/output configurations, such as 8 DI/6 DO, 14 DI/10 DO and 24 DI/16 DO. Technical data such as supply voltage (24 V DC) and operating voltage range (85‑264 V DC) are provided.
The document also describes the supported communication interfaces, including RS‑232, RS‑485, USB and Modbus RTU, and gives wiring and mounting information for DIN rail installation. LED indicators for RUN/STOP status are shown, and reference part numbers for related modules (e.g., SIWAREX, GPRS) are listed.
| Supply voltage | 24 V DC |
|---|---|
| Operating voltage range | 85‑264 V DC |
| I/O (CPU 222) | 8 DI / 6 DO |
| I/O (CPU 224) | 14 DI / 10 DO |
| I/O (CPU 226) | 24 DI / 16 DO |
| Communication interfaces | RS‑232, RS‑485, USB, Modbus RTU |
The S7-200CN supports RS‑232, RS‑485, USB and Modbus RTU interfaces.
CPU 221 provides 4 DI/4 DO, CPU 222 provides 8 DI/6 DO, CPU 224 provides 14 DI/10 DO, and CPU 226 provides 24 DI/16 DO.
The CPU requires a 24 V DC supply.