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This Siemens cable provides a dependable connection between SIMATIC S5 programming devices and automation units. The Siemens 6ES5721-5BD20 links the programming interface directly to the central controller. Its shielded construction effectively minimizes electromagnetic interference during data transmission. This cable suits both temporary diagnostic connections and permanent installations. The Siemens 6ES5721-5BD20 ensures stable communication across the entire S5 product family.
Connector Design and Physical Specifications
This cable features a 15-pin D-sub connector on the programming device side. The opposite end uses a 25-pin D-sub connector for the controller interface. Its overall length measures exactly 5 meters for flexible positioning. The outer diameter reaches approximately 6.5 mm with robust PVC insulation. This assembly weighs around 0.35 kilograms for convenient handling. The Siemens 6ES5721-5BD20 uses tinned copper conductors for excellent signal integrity. Each conductor features a cross-section of 0.25 mm² for reliable current carrying.
Shielding and Electrical Characteristics
A braided copper shield covers the internal conductor bundle completely. This shield provides over 90% optical coverage against external noise sources. The cable’s characteristic impedance stabilizes at 120 ohms for matched signal transfer. Maximum operating voltage reaches 300 V AC or DC without insulation breakdown. Insulation resistance exceeds 100 MΩ per kilometer at 20°C. The Siemens 6ES5721-5BD20 exhibits a capacitance of approximately 60 pF per meter. Its loop resistance stays below 150 Ω per kilometer for efficient transmission.
Temperature Range and Environmental Durability
This cable operates reliably between -30°C and 80°C under normal conditions. It withstands temporary exposure to oils and mild chemical agents. The PVC jacket resists UV radiation for outdoor cabinet installations. Bending radius should not fall below 10 times the cable diameter. This cable maintains full performance even after 5 million flex cycles.
Detailed Specification Table
| Parameter | Specification |
|---|---|
| Connector Type (Device Side) | 15-pin D-sub (male) |
| Connector Type (PLC Side) | 25-pin D-sub (male) |
| Cable Length | 5 meters |
| Outer Diameter | 6.5 mm |
| Weight | Approx. 0.35 kg |
| Conductor Cross-Section | 0.25 mm² |
| Shielding Coverage | >90% braided copper |
| Characteristic Impedance | 120 Ω |
| Maximum Voltage | 300 V AC/DC |
| Insulation Resistance | >100 MΩ/km |
| Capacitance | 60 pF/m |
| Loop Resistance | <150 Ω/km |
| Operating Temperature | -30°C to 80°C |
| Minimum Bending Radius | 10 x cable diameter |
Application and Installation Notes
Use this cable for connecting PG 685 or PG 710 programming devices. It also interfaces with CP 521 and CP 524 communication processors. Secure the cable using cable ties every 50 centimeters along its path. Avoid sharp bends that could damage the internal shielding layer. The Siemens 6ES5721-5BD20 supports baud rates up to 9600 bit/s. Always disconnect power before plugging or unplugging either connector. Check pin assignments against your device documentation before use. Regular visual inspection helps maintain optimal signal quality over time.