Siemens 6GK1905-6AA00 PROFIBUS Cable – SIMATIC NET

Siemens 6GK1905-6AA00: PROFIBUS DP Fast Connect Bus Cable in SIMATIC NET Field Communication Architecture

The 6GK1905-6AA00 is a shielded, twisted-pair bus cable manufactured by Siemens AG to the SIMATIC NET PROFIBUS specification. It serves as the physical transmission medium for PROFIBUS DP networks operating under the RS-485 electrical standard, defined in EN 50170 and IEC 61158 Type A. Within a distributed control architecture, this cable forms the backbone of the cyclic master-slave polling loop — carrying process data, parameter records, and diagnostic telegrams between the DP master controller and field-level slave devices at baud rates from 9.6 kbit/s up to 12 Mbit/s.

The cable’s Fast Connect termination system uses insulation displacement contact (IDC) technology, allowing field engineers to terminate conductors into PROFIBUS connectors of the 6ES7972-0Bxx series without stripping, soldering, or crimping. The IDC blades pierce the conductor insulation under controlled force, establishing a gas-tight, vibration-resistant electrical joint. This mechanism is particularly valuable in panel-build environments where wiring density is high and commissioning schedules are compressed.

The violet outer jacket conforms to the IEC 61158 color convention for PROFIBUS DP, providing immediate visual identification during maintenance, fault tracing, and cable routing audits. In multi-protocol cabinet environments — where PROFINET (green), AS-Interface (yellow), and PROFIBUS DP (violet) cables coexist — this color discipline directly reduces mis-termination risk during field modifications.

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Technical Parameters

Hardware Logical Analysis

The 6GK1905-6AA00 implements a dual-layer shielding architecture: an outer copper braid with ≥85% optical coverage combined with an inner aluminium-polyester foil that provides 100% surface coverage. These two layers address different EMI threat profiles. The foil layer attenuates high-frequency radiated interference — particularly relevant in drive-dense environments where SINAMICS inverters generate switching noise in the 2–20 kHz range and its harmonics. The braid layer provides low-impedance ground continuity along the cable run, suppressing common-mode noise induced by ground potential differences between cabinet panels and remote field junction boxes.

The characteristic impedance specification of 135–165 Ω is tightly controlled through the conductor geometry and dielectric material selection. At 12 Mbit/s, the PROFIBUS DP bit period is 83 ns. Any impedance discontinuity — caused by a cable splice, a damaged section, or an out-of-spec substitute cable — generates a reflected wave that arrives back at the transmitter within the bit window, corrupting the differential signal. The 6GK1905-6AA00’s controlled impedance tolerance ensures that reflections remain below the RS-485 noise margin threshold across the full segment length.

The IDC Fast Connect termination mechanism deserves specific analysis. Conventional screw-terminal PROFIBUS connectors require the installer to strip 6–8 mm of conductor insulation, insert the bare wire, and torque the screw to specification — a process sensitive to strip length accuracy and torque consistency. IDC contacts eliminate these variables: the blade geometry is fixed, the displacement force is determined by the connector housing, and the resulting contact resistance is typically <5 mΩ per conductor. This consistency is measurable: IDC-terminated segments show lower variance in time-domain reflectometry (TDR) traces compared to screw-terminal equivalents, indicating more uniform impedance along the bus.

System Integration Benefits

• Deterministic cycle time preservation: The cable’s low capacitance (≤30 pF/m) minimizes signal rise-time degradation, allowing the DP master to maintain its configured bus cycle time without guard-time inflation at high baud rates.
• Diagnostic transparency: Uniform impedance along the segment enables accurate TDR-based fault location. Maintenance teams can pinpoint cable breaks or connector faults to within ±0.5 m using standard PROFIBUS diagnostic tools.
• Reduced commissioning time: Fast Connect IDC termination eliminates soldering and crimping steps, cutting per-connector wiring time from approximately 8 minutes (screw terminal) to under 2 minutes — measurable on large panel builds with 50+ PROFIBUS nodes.
• EMC compliance in Class A environments: The dual-shield construction supports EN 55011 Class A emission limits, allowing the cable to be routed in proximity to power cables without requiring additional conduit separation beyond standard IEC 61439 panel wiring rules.
• Broad device compatibility: Compliant with EN 50170 Type A, the cable operates with any standards-conformant PROFIBUS DP device — Siemens S7-300/400/1500, ET 200 distributed I/O, SINAMICS drives, and third-party DP slaves from ABB, Danfoss, and Endress+Hauser.
• Topology flexibility: Supports linear bus topology with stub lengths ≤1.5 m at baud rates ≤1.5 Mbit/s, and integrates with PROFIBUS repeaters (6ES7972-0AA02-0XA0) for multi-segment networks up to 126 nodes.
• Maintenance identification: Violet jacket color per IEC 61158 convention allows instant cable identification during live-panel maintenance, reducing the risk of accidental disconnection of adjacent network cables.
• Long-term mechanical stability: PVC jacket with –20 °C to +60 °C operating range and 40 mm minimum fixed bending radius accommodates standard cable tray and conduit routing without jacket cracking or conductor fatigue over a 10+ year service life.

Quality Assurance & Global Logistics

Every unit of 6GK1905-6AA00 supplied by siemensplc.com is sourced through verified Siemens distribution channels. Prior to dispatch, each cable reel or cut length undergoes a three-point inspection: jacket integrity check (visual and tactile), shield continuity measurement (end-to-end resistance ≤110 Ω/km), and part marking verification against the Siemens product label database. Siemens holographic authenticity labels and laser-etched part numbers are confirmed before packaging. Certificates of conformity and batch traceability documentation are available upon request for quality-managed procurement processes.

Shipments originate from our warehouse in Xiamen, China — a major logistics hub with direct access to DHL Express, FedEx International Priority, and UPS Worldwide Expedited services. Standard in-stock orders are dispatched within 1 business day of payment confirmation. Transit times to major industrial regions: Europe 3–5 business days, Southeast Asia 2–3 business days, North America 4–6 business days, Middle East 4–7 business days. For project quantities or scheduled delivery requirements, contact our team to arrange consolidated shipment or bonded warehouse staging.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
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