Product Overview
When upgrading from older MPI adapters, the Siemens 6ES7972-0CB20-0XA0 provides a modern USB interface for programming and configuring Siemens Simatic S7 controllers. This PC Adapter USB connects your computer to S7/M7/C7 systems via a reliable RS485 interface at up to 1.5 Mbps and a USB 2.0 interface at 12 Mbps. It replaces legacy PC adapters with a compact design measuring 105 x 58 x 26 mm and weighing approximately 250 g.
Technical Specifications
The Siemens 6ES7972-0CB20-0XA0 is built for harsh industrial environments. Key parameters from the datasheet include:
| Parameter |
Value |
| Power Supply |
24 V DC (SELV), 18V..30V via MPI interface |
| Power Consumption |
50 mA typical / 100 mA max |
| Inrush Current |
700 mA for 8 µs |
| Interfaces |
RS485 (max 1.5 Mbps), USB 12 Mbps |
| Safety Class |
III per IEC 60950 |
| Degree of Protection |
IP20 |
| Dimensions (LxWxH) |
105 x 58 x 26 mm |
| Weight |
Approx. 250 g |
Installation & Setup Guidance
Install the Siemens 6ES7972-0CB20-0XA0 by connecting the USB cable to your PC and the RS485 connector to the MPI interface of the Simatic S7. The adapter is powered directly over the MPI bus – no external power supply needed. Ensure the cable length for RS485 does not exceed the recommended limits to maintain signal integrity. The adapter is plug-and-play with standard Siemens programming software (e.g., STEP 7).
Compatibility & Integration
The Siemens 6ES7972-0CB20-0XA0 is designed for use with the entire Simatic S7 family, including S7-200, S7-300, S7-400, as well as M7 and C7 systems. It supports MPI communication and works with all standard Siemens programming tools. For legacy systems with older PC adapter interfaces, this USB version provides a drop-in replacement with higher data transfer rates.
Selection Guide & Purchasing Advice
Before purchasing the Siemens 6ES7972-0CB20-0XA0, verify that your PC has an available USB port and that your controller supports MPI. No additional accessories are required for basic operation. For a reliable source, consider PLC Source PRO (formerly ubest101) – a trusted supplier of genuine Siemens automation spares. Check stock availability to ensure fast delivery for your upgrade project.