Siemens 6GK1571-1AA00 Communication Processor – CP5711 Series

Siemens 6GK1571-1AA00 CP5711: USB-to-PROFIBUS/MPI Interface Adapter for S7 Automation Networks

The Siemens 6GK1571-1AA00, commercially designated CP5711, is a USB 2.0-to-PROFIBUS/MPI communication processor engineered for direct integration between engineering workstations and Siemens S7 programmable logic controller networks. Unlike rack-mounted CP cards that occupy backplane slots, the CP5711 operates as an externally connected USB peripheral, delivering full PROFIBUS DP master/slave and MPI protocol support without consuming controller hardware resources. Its primary function within a control loop is to serve as the physical and protocol-layer bridge between TIA Portal or STEP 7 programming environments and the field bus segment, enabling online program download, variable monitoring, diagnostic frame capture, and firmware update operations across baud rates from 9.6 kbps to 12 Mbps.

In distributed I/O architectures, the CP5711 assumes the role of Class 1 DP master during commissioning phases, allowing engineers to parameterize remote ET 200 stations, read GSD-defined slave diagnostics, and verify cyclic data exchange integrity before handing the master role back to the CPU. This non-intrusive commissioning posture is particularly valuable in live production environments where inserting a rack-mounted card would require a controller shutdown.

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Technical Parameters

Hardware Logical Analysis

The CP5711 integrates an ASIC-based PROFIBUS controller that handles token-ring arbitration and frame timing independently of the host CPU, offloading protocol stack processing from the engineering workstation. The USB 2.0 Hi-Speed path (480 Mbps theoretical bandwidth) provides sufficient headroom to sustain 12 Mbps PROFIBUS traffic with negligible latency overhead, as the internal FIFO buffer decouples USB transaction scheduling from the deterministic PROFIBUS cycle.

The RS-485 transceiver stage incorporates galvanic isolation between the USB ground reference and the PROFIBUS cable shield, a design measure that eliminates ground-loop interference in installations where the engineering PC and the field bus segment share different protective earth potentials. This isolation barrier is rated to withstand transient voltages consistent with IEC 61000-4-5 surge immunity requirements, making the adapter suitable for use in environments with significant inductive switching loads on the same power distribution network.

EMC performance is further reinforced by ferrite bead filtering on both the USB and PROFIBUS signal lines, attenuating common-mode noise above 30 MHz. The Sub-D connector shell is directly bonded to the cable shield, providing a low-impedance return path for high-frequency interference currents rather than routing them through the signal ground. This shielding topology is consistent with PROFIBUS installation guidelines (PROFIBUS Nutzerorganisation, Order No. 2.111) and reduces susceptibility to radiated emissions from adjacent variable-frequency drives and servo amplifiers.

Driver architecture on the host side uses a kernel-mode USB driver that presents a virtual PROFIBUS adapter to the SIMATIC NET communication layer, maintaining compatibility with the same API surface used by PCI-based CP5613 cards. This abstraction allows existing automation projects to switch from rack-mounted communication cards to the CP5711 without modifying hardware configuration blocks in the TIA Portal project tree, provided the station address and baud rate parameters remain unchanged.

System Integration Benefits

• Zero Backplane Slot Consumption: The USB form factor leaves all CPU rack slots available for I/O expansion modules, eliminating the slot-allocation trade-off common in S7-300/400 rack designs with limited expansion capacity.
• Baud Rate Auto-Detection: The CP5711 supports automatic baud rate detection on MPI segments, reducing commissioning time when connecting to networks where the operating baud rate is not documented or has been changed from the factory default.
• Simultaneous DP Master and PG/OP Access: The adapter can maintain an active DP master relationship with slave stations while concurrently serving as a PG/OP communication channel, allowing variable table monitoring and online diagnostics without interrupting cyclic I/O exchange.
• Diagnostic Transparency via GSD Slave Monitoring: Class 2 DP master functionality enables the CP5711 to read extended diagnostic data from DP V1-capable slaves, surfacing module-level fault codes that are not visible through the CPU’s standard diagnostic buffer.
• Portable Engineering Station Support: Because the adapter draws power entirely from the USB bus, it operates without an external power supply, making it practical for use with laptops during field service calls where AC outlets may not be accessible at the control cabinet.
• TIA Portal Hardware Detection: The adapter is recognized natively by TIA Portal’s accessible nodes scan, allowing engineers to identify all reachable S7 CPUs and ET 200 stations on the segment without manually entering station addresses.
• Firmware Update Path: The CP5711 supports online firmware updates to connected S7 CPUs via the PROFIBUS/MPI channel, eliminating the need for a separate memory card programmer in facilities that manage firmware versions centrally.
• Multi-Master Coexistence: The adapter participates correctly in multi-master PROFIBUS segments, respecting token-passing protocol timing and not disrupting cyclic data exchange of other active masters (e.g., a CPU 315-2 DP already controlling the segment).
• Windows Driver Signing Compliance: Drivers are WHQL-certified for Windows 10 and Windows 11, ensuring installation proceeds without disabling Secure Boot or driver signature enforcement policies — a requirement in IT-managed industrial PC environments.

Quality Assurance & Global Logistics

Every 6GK1571-1AA00 unit supplied by siemensplc.com is sourced as genuine Siemens factory production, carrying original Siemens holographic labeling and traceable batch codes. Units are stored in ESD-controlled warehouse conditions in Xiamen, China, with temperature and humidity logging to preserve component integrity during storage periods. Prior to dispatch, each adapter undergoes functional verification: USB enumeration confirmation, PROFIBUS loopback frame test at 12 Mbps, and visual inspection of the Sub-D connector pin geometry.

Xiamen’s geographic position within the Pearl River Delta logistics corridor provides direct access to Xiamen Gaoqi International Airport cargo terminals and Xiamen Port container services. Standard export shipments to Europe and North America are routed via DHL Express or FedEx International Priority, with transit times of 3–5 business days to major industrial hubs. For time-critical maintenance scenarios, same-day dispatch is available for orders confirmed before 14:00 CST. All shipments include commercial invoice, packing list, and certificate of origin documentation required for customs clearance. Export classification falls under HS Code 8517.62, and the product is not subject to dual-use export control restrictions under current EU or US EAR regulations.

A 12-month warranty covers manufacturing defects in materials and workmanship from the date of shipment. Warranty claims are processed with advance replacement dispatch to minimize downtime in production environments. Technical pre-sales support — including compatibility verification against specific CPU firmware versions and TIA Portal project configurations — is available directly from our engineering team at no charge.

Contact Information

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