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Technical Overview
The Siemens 6ES5731-1BD20 is a programming cable for the SIMATIC S5 programmable logic controller series. This cable connects standard personal computers to S5 CPUs without requiring proprietary programming devices. The 6ES5731-1BD20 serves as a PC interface converter cable, enabling direct communication between a computer’s RS-232 serial port and the S5’s TTY interface. This cable simplifies system maintenance and program updates by allowing engineers to use standard laptops for S5 programming tasks. The cable incorporates an active RS-232 to TTY converter within its housing for proper signal level translation.
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Model | 6ES5731-1BD20 |
| Product Type | SIMATIC S5 PC Programming Cable |
| Compatible Systems | SIMATIC S5 (S5-90U, S5-95U, S5-100U, S5-115U, etc.) |
| Connector Type (PC End) | 9-pin D-sub female (RS-232) |
| Connector Type (PLC End) | 15-pin D-sub male (TTY/PG interface) |
| Interface Standard | RS-232 to TTY with active converter |
| Cable Length | 2.5 meters |
| Maximum Baud Rate | 9.6 kbps to 187.5 kbps |
| Power Supply | Derives power from RS-232 handshake lines |
| Operating Temperature | 0°C to 60°C |
| Unit Weight | Approximately 0.25 kg |
Application and Compatibility Notes
The 6ES5731-1BD20 eliminates the need for dedicated Siemens programming devices (PGs) for S5 maintenance tasks. Users can connect this cable directly to a standard PC or laptop running S5 programming software. The internal converter handles all signal level translation, making the connection transparent to the user. This cable supports various programming activities including program upload, download, online monitoring, and diagnostics. For optimal performance, users should configure their PC’s serial port settings to match the S5 CPU’s communication parameters. This cable is discontinued but remains essential for supporting legacy S5 systems in operation.