Siemens 6GK5788-1GD00-0AA0 Industrial Wireless Access Point – SCALANCE W788

Siemens 6GK5788-1GD00-0AA0 SCALANCE W788-1 M12: Deterministic WLAN Infrastructure for Industrial Automation Networks

The SCALANCE W788-1 M12, identified by order number 6GK5788-1GD00-0AA0, is a single-radio industrial WLAN access point designed for integration into PROFINET-based automation architectures. It operates across the 2.4 GHz and 5 GHz frequency bands under IEEE 802.11a/b/g/n, delivering a maximum PHY-layer throughput of 300 Mbit/s. The M12 connector variant is purpose-built for environments where IP67 ingress protection is a baseline requirement — not an option. This unit occupies a defined role in the SIMATIC NET communication hierarchy: it bridges the deterministic Ethernet backbone of a control cabinet to mobile or distributed field devices, AGVs, and remote I/O nodes without introducing unacceptable jitter into the PROFINET cycle.

Unlike consumer-grade access points adapted for industrial use, the W788-1 M12 is engineered from the ground up for 24/7 continuous operation in environments characterized by electromagnetic interference from variable-frequency drives, arc welding equipment, and high-current bus bars. Its hardware architecture reflects this: the RF front-end incorporates shielded antenna paths, and the device housing is die-cast aluminum — a material choice that simultaneously provides mechanical rigidity and acts as a Faraday enclosure for the internal PCB assembly.

In a typical deployment, the 6GK5788-1GD00-0AA0 functions as the fixed infrastructure node in a client-AP topology. Mobile PROFINET devices — such as SCALANCE W748-1 M12 clients mounted on AGVs — associate with it and maintain a roaming session as they traverse the plant floor. The access point’s iFeatures firmware stack manages fast roaming handoffs (sub-50 ms) between adjacent APs, preserving PROFINET IO cycle integrity during transitions. This is not a marketing claim; it is a measurable parameter verifiable against IEC 61784-5-3 conformance test results.

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Technical Parameters

Hardware Logical Analysis

The 6GK5788-1GD00-0AA0 implements a 2×2 MIMO antenna architecture with spatial multiplexing (SM) enabled under 802.11n HT40 channel bonding. In the 5 GHz band, this yields a 40 MHz channel width with a guard interval of 400 ns, producing the rated 300 Mbit/s PHY rate. In practice, effective UDP throughput at the application layer is approximately 150–180 Mbit/s under low-interference conditions — a figure consistent with 802.11n MAC overhead and CSMA/CA contention mechanics.

The EMC design of the W788-1 M12 addresses three primary interference vectors present in industrial environments. First, conducted emissions from the 24 V DC supply rail are suppressed by an integrated LC filter stage at the power input, attenuating switching noise from adjacent VFDs that couples through shared DC bus segments. Second, radiated immunity is achieved through the die-cast aluminum enclosure, which provides approximately 20–30 dB of shielding effectiveness across the 30 MHz–1 GHz range per IEC 61000-4-3 test methodology. Third, the N-type antenna connectors maintain 50 Ω impedance continuity to external directional or omnidirectional antennas, preventing standing wave reflections that would degrade receiver sensitivity.

The device’s iFeatures firmware implements a proprietary fast-roaming protocol that reduces client reassociation time to under 50 ms. This is accomplished through pre-authentication: the current AP forwards client credentials to adjacent APs via the wired backbone before the client physically moves out of coverage. When the client initiates a reassociation request, the target AP already holds a valid session context, eliminating the full 802.1X EAP exchange from the handoff critical path. For PROFINET IO Class 1 applications with update rates of 8 ms or slower, this handoff latency is within the permissible jitter budget defined in IEC 61158-6-10.

The integrated managed switch function — present on the Ethernet backhaul port — supports 802.1Q VLAN tagging, enabling traffic segmentation between PROFINET IO data, HMI communication, and management plane traffic on a single physical cable run. This reduces wiring complexity in installations where conduit capacity is constrained.

System Integration Benefits

• PROFINET IO Wireless Transparency: The W788-1 M12 operates as a transparent Layer 2 bridge, preserving PROFINET frame structure and MAC addressing across the wireless segment. The PROFINET controller sees the wireless link as a standard Ethernet segment, requiring no protocol adaptation at the PLC level.
• SINEMA Remote Connect Compatibility: The device integrates natively with Siemens SINEMA Remote Connect, enabling encrypted VPN tunnels for remote diagnostics and firmware updates without exposing the automation network to the public internet.
• STEP 7 / TIA Portal Device Management: The W788-1 M12 is represented as a GSDML device in the PROFINET device library, allowing it to be configured, monitored, and diagnosed directly from TIA Portal V14 and later without separate management software.
• Redundant AP Topology Support: Multiple W788-1 M12 units can be deployed in overlapping coverage zones with the same SSID and BSSID, forming a seamless roaming domain. The iFeatures fast-roaming protocol coordinates handoffs across this domain without requiring a WLAN controller appliance.
• Diagnostic Transparency via SNMP and Web UI: The device exposes RF channel utilization, client association table, signal strength per client (RSSI in dBm), and retry frame counters via SNMPv3 and an integrated HTTPS management interface. These metrics feed directly into SIMATIC NET diagnostic tools for predictive maintenance workflows.
• VLAN-Based Traffic Prioritization: 802.1p QoS marking is supported on the Ethernet backhaul port, allowing PROFINET IO frames to be assigned to the highest priority queue (CoS 7) while HMI and IT traffic occupies lower-priority queues. This preserves cycle-time determinism under network congestion conditions.
• ATEX Zone 2/22 Certification: The device carries ATEX certification for use in potentially explosive atmospheres (gas Zone 2, dust Zone 22), expanding its applicable installation scope to chemical processing, oil and gas, and grain handling facilities without requiring an additional explosion-proof enclosure in Zone 2 areas.
• Scalable Client Density: The W788-1 M12 supports up to 16 simultaneously associated WLAN clients per radio. In AGV applications with staggered traffic patterns, this client capacity is sufficient for medium-density fleets without requiring additional AP infrastructure.

Quality Assurance & Global Logistics

Every unit of the 6GK5788-1GD00-0AA0 supplied through siemensplc.com is sourced as genuine Siemens OEM hardware. Siemens manufactures the SCALANCE W788 series in Germany under ISO 9001-certified production processes, with each unit assigned a unique serial number traceable through Siemens’ product authentication portal. We do not supply remanufactured, relabeled, or third-party-compatible substitutes under this order number.

Our procurement and inspection workflow includes serial number cross-referencing against Siemens’ authorized distribution records, physical label verification against current OEM artwork specifications, and connector integrity inspection for M12 thread condition and pin alignment. Units that do not pass inspection are quarantined and not dispatched.

Logistics operations are managed from Xiamen, China — a major export hub with direct access to international express carriers and sea freight consolidators. Standard dispatch for in-stock units is within 1–3 business days of payment confirmation. Shipping options include DHL Express (3–5 business days to most destinations), FedEx International Priority, and EMS for cost-sensitive shipments. For bulk orders exceeding 10 units, sea freight LCL consolidation is available with full export documentation: commercial invoice, packing list, certificate of origin (Form A or CO), and HS code classification (HS 8517.62 for WLAN access points). All shipments are insured at declared value. Customs clearance support documentation is provided as standard.

A 12-month warranty applies to all units from the date of dispatch. Warranty coverage addresses functional failure under normal operating conditions as defined in the Siemens product datasheet. Physical damage resulting from incorrect installation voltage, reverse polarity, or mechanical impact is excluded. Warranty claims are processed within 5 business days of receipt of the returned unit and supporting documentation.

Contact Information

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