Siemens A5E36717803 Communication Module – SIMATIC S7

Siemens A5E36717803 – PROFINET Communication Processor for SIMATIC S7 Backplane Architecture

The Siemens A5E36717803 is a PROFINET-capable communication processor (CP) engineered for integration within the SIMATIC S7 modular rack infrastructure. Its primary function is to serve as the deterministic data exchange gateway between the S7 CPU and upstream SCADA hosts, peer PLCs, or distributed I/O nodes operating under IEC 61158-compliant PROFINET IO protocols. Unlike software-emulated communication stacks, this module executes protocol handling on dedicated silicon, offloading cyclic frame scheduling from the CPU’s main scan cycle and preserving deterministic response times even under high-load network conditions.

In a typical S7-300 or S7-400 control cabinet, the A5E36717803 occupies a standard rack slot and communicates with the CPU via the internal S7 backplane bus at a sustained transfer rate that eliminates the latency penalties associated with external gateway adapters. The module’s onboard microcontroller manages PROFINET IO controller and device roles simultaneously, enabling flexible topologies where the same physical unit can act as an IO controller for downstream field devices while maintaining an IO device relationship with a higher-level DCS or safety controller.

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Technical Parameters

Hardware Logical Analysis

The A5E36717803 implements a dual-processor architecture: a network processor dedicated to Ethernet frame handling and a secondary application processor managing S7 protocol state machines and backplane bus arbitration. This separation ensures that a burst of incoming PROFINET frames does not stall the backplane data transfer cycle, a failure mode common in single-core CP designs under heavy IO polling loads.

EMC Design: The module’s PCB layout employs a split ground plane strategy, isolating the high-frequency Ethernet PHY section from the backplane logic domain. Transformer-coupled RJ45 magnetics provide 1.5 kV isolation between the network port and internal circuitry, meeting EN 61000-4-4 (EFT/Burst, 2 kV) and EN 61000-4-5 (surge, 1 kV line-to-earth) immunity levels. Ferrite bead arrays on the backplane connector pins suppress common-mode noise injected from adjacent power supply modules.

PROFINET IRT Synchronization: For applications requiring isochronous real-time (IRT) operation, the module’s network processor implements hardware-based send clock synchronization using IEEE 1588 PTP-derived timestamps. The send clock jitter is held below ±1 µs, which satisfies the timing budget for motion control applications where axis synchronization tolerances are in the range of 10–50 µs.

Redundancy Arbitration: In S7-400H redundant CPU configurations, the A5E36717803 participates in the sync-redundancy protocol. The module monitors the backplane sync telegram from the active CPU and maintains a shadow state of the PROFINET IO data image. On CPU switchover, the module executes a bumpless handover within the PROFINET watchdog timeout window (configurable, minimum 3× update cycle), preventing IO device fault reactions during planned or unplanned failover events.

Diagnostic Transparency: The module exposes a structured diagnostic buffer accessible via S7 communication (SZL partial list SZL-ID W#16#00B4). Each diagnostic entry carries a timestamp with 1 ms resolution, an event class identifier, and a channel-level fault code. This granularity allows maintenance engineers to correlate network events with process alarms without relying on external network analyzers.

System Integration Benefits

• Deterministic Cycle Offload: Protocol execution on dedicated silicon removes PROFINET frame processing from the CPU scan cycle, maintaining PLC cycle times even when network traffic peaks during topology changes or device reconnections.
• Concurrent IO Roles: Operating as both PROFINET IO controller and IO device simultaneously allows hierarchical network architectures without additional gateway hardware, reducing panel footprint and wiring complexity.
• TIA Portal Hardware Catalog Integration: The module is natively catalogued in TIA Portal, enabling drag-and-drop configuration, automatic address assignment, and GSD-free device parameterization within the engineering workflow.
• Integrated Web Diagnostics: An embedded HTTP server provides real-time module status, network statistics (frame counters, CRC error rates, port link state), and IO device topology maps accessible from any standard browser without additional software.
• SNMP v1/v3 Support: Network management systems can poll the module via SNMP for bandwidth utilization, port status, and alarm traps, integrating the PLC network segment into enterprise IT monitoring infrastructure.
• Firmware Rollback Protection: The module stores two firmware images in non-volatile flash. If a firmware update fails or produces instability, the bootloader automatically reverts to the last known-good image, preventing unrecoverable field failures during maintenance windows.
• Shared Device Functionality: Multiple S7 CPUs can access the same PROFINET IO device through the module’s shared device feature, enabling cost-effective redundant access to field instrumentation without duplicating physical wiring.
• Acyclic Record Data Services: Beyond cyclic IO, the module supports PROFINET acyclic read/write services (Record Data Objects), allowing parameterization of intelligent field devices (e.g., variable-frequency drives, smart transmitters) directly from the PLC program using standard SFB52/SFB53 function blocks.

Quality Assurance & Global Logistics

Every A5E36717803 unit stocked at our Xiamen facility is sourced exclusively through verified Siemens-authorized distribution channels. Each module arrives in original Siemens anti-static packaging with intact factory seals, holographic authenticity labels, and a traceable batch number cross-referenced against Siemens AG production records. Upon receipt, our technical team performs a three-stage incoming inspection: visual and label verification against Siemens part number databases, continuity and power-on functional test on a live S7-300 rack, and firmware version confirmation against the current Siemens release matrix.

Storage conditions in our Xiamen warehouse maintain temperature between 15 °C and 25 °C with humidity control below 60 % RH, consistent with Siemens storage class 1K4 requirements. Modules are stored in ESD-safe shelving with individual anti-static bags and moisture barrier packaging for long-term stock.

For international shipments, we partner with DHL Express, FedEx International Priority, and UPS Worldwide Express. Standard export documentation includes a commercial invoice, packing list, certificate of origin (China), and a Siemens-traceable delivery note. For customers requiring additional compliance documentation, a certificate of conformity and incoming inspection report are available upon request at no additional charge.

Typical dispatch time for in-stock units is 1–2 business days from order confirmation. Transit times to major industrial hubs: Europe 3–5 days, North America 4–6 days, Southeast Asia 2–3 days, Middle East 4–7 days. All shipments are fully insured and tracked end-to-end. A 12-month warranty covers manufacturing defects and functional failures under normal operating conditions.

Contact Information

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