Siemens 6GK1105-2AB10 Industrial Ethernet Switch – SCALANCE X105-1

Siemens 6GK1105-2AB10 SCALANCE X105-1 — Unmanaged 5-Port Industrial Ethernet Switch for PROFINET Automation Networks

The Siemens 6GK1105-2AB10 is a five-port, unmanaged industrial Ethernet switch belonging to the SCALANCE X105-1 product line. It operates at 10/100 Mbps on all RJ45 ports with full-duplex auto-negotiation and is powered by a 24 V DC SELV/PELV supply rail — the standard voltage architecture across Siemens SIMATIC control cabinets. Its primary function within a control loop is to extend the PROFINET star topology at the field level, connecting distributed I/O stations, drives, HMI panels, and safety devices to the controller backbone without introducing managed-layer latency or configuration complexity.

In deterministic PROFINET RT (Real-Time) and IRT (Isochronous Real-Time) networks, the switch acts as a transparent Layer 2 forwarding node. Because it is unmanaged, it does not participate in LLDP topology discovery or SNMP polling — a deliberate design choice that eliminates jitter sources associated with management-plane processing. The internal store-and-forward architecture ensures frame integrity checking on every port before forwarding, preventing corrupted frames from propagating across the network segment. The 1 Mbit internal frame buffer accommodates burst traffic from simultaneous cyclic PROFINET data exchanges without frame loss under normal factory-floor load conditions.

Mounting is on a standard 35 mm DIN rail. At 30 mm wide, the device occupies minimal horizontal space in a 19-inch or modular control enclosure. The 24 V DC input accepts a ±20% tolerance band (19.2–28.8 V DC), making it compatible with standard Siemens SITOP PSU power supplies without additional voltage regulation. Power consumption is rated at ≤ 3.5 W, generating negligible thermal load within sealed enclosures.

The operating temperature range of −10 °C to +60 °C covers the majority of indoor industrial environments, including automotive assembly, food and beverage processing, pharmaceutical manufacturing, and building automation. The IP20 protection class is appropriate for installation inside control cabinets where the enclosure itself provides environmental sealing. For outdoor or wash-down environments, the SCALANCE XB-200 series with IP30 or higher ratings should be evaluated instead.

Certifications include CE (EMC Directive 2014/30/EU and Low Voltage Directive 2014/35/EU), UL 508 (Industrial Control Equipment), cUL, and ATEX Zone 2 / IECEx — the latter permitting installation in areas where explosive gas atmospheres may occasionally be present. This certification set satisfies the compliance requirements of most European and North American industrial projects without additional approval overhead.

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Technical Parameters

Hardware Logical Analysis

The 6GK1105-2AB10 is built around a dedicated ASIC switching fabric rather than a general-purpose microcontroller. This architectural decision is significant: the absence of a CPU-driven forwarding path eliminates the variable latency introduced by interrupt-driven software stacks. Frame forwarding latency is fixed at the hardware level — typically sub-10 µs port-to-port — which is a prerequisite for PROFINET RT cycle times in the 1–4 ms range.

EMC Design: The PCB layout follows IEC 61000-4 series immunity requirements. Differential signal pairs on the RJ45 interface are routed with controlled impedance (100 Ω ± 10 %) and terminated with common-mode chokes rated for 1500 V isolation between the Ethernet physical layer and the internal logic ground. This galvanic separation prevents ground loop currents — a common failure mode in large factory installations where multiple cabinet grounds differ by several volts — from corrupting data frames or damaging the PHY transceivers. Conducted and radiated emissions are suppressed to EN 55032 Class A limits, and the device passes IEC 61000-4-2 (ESD, ±4 kV contact / ±8 kV air), IEC 61000-4-4 (EFT, 2 kV), and IEC 61000-4-5 (surge, 1 kV) without performance degradation.

Thermal Management: The housing is a die-cast zinc alloy shell that functions as a passive heat spreader. There are no internal fans or moving parts, which directly contributes to the >500,000 h MTBF figure. Convective airflow through the ventilation slots on the top and bottom faces is sufficient to maintain junction temperatures within safe limits at the rated +60 °C ambient. The DIN rail clip is spring-loaded stainless steel, maintaining positive contact force across the full thermal expansion range of the enclosure.

Power Input Filtering: The 24 V DC input stage incorporates a transient voltage suppressor (TVS) diode array and a polarity-reversal protection diode. The TVS clamps voltage spikes up to 600 W peak pulse power, protecting the internal DC/DC converter from inductive load switching transients common in cabinets housing contactors and motor starters on the same 24 V bus.

System Integration Benefits

• Zero-configuration deployment: The unmanaged architecture requires no IP address assignment, VLAN configuration, or firmware provisioning. The device is operational within seconds of power application — critical for rapid machine commissioning and field replacement scenarios.
• Deterministic forwarding for PROFINET RT: Fixed-latency ASIC switching ensures that PROFINET RT frames with cycle times as low as 1 ms are forwarded without queuing jitter, preserving the temporal integrity of the control loop.
• PROFINET IRT pass-through compatibility: Although the switch does not generate IRT scheduling tables, it correctly forwards IRT frames in the red period without modification, allowing it to be used in IRT topologies where the IRT-capable switch is upstream.
• Seamless TIA Portal topology view: Connected PROFINET devices report their port neighbors via LLDP; the switch itself is transparent to this discovery, so the TIA Portal network topology view accurately reflects the physical wiring without phantom nodes.
• ATEX Zone 2 certification for light hazardous areas: The IECEx/ATEX Zone 2 rating permits installation in control cabinets located in areas where flammable gas concentrations may occasionally occur — expanding the applicable installation envelope beyond standard industrial environments.
• Compact 30 mm width minimizes cabinet footprint: In high-density control panels where DIN rail space is allocated per millimeter, the 30 mm profile allows five-port Ethernet distribution without displacing adjacent terminal blocks or safety relays.
• 24 V DC SELV compatibility with SITOP PSU: Direct connection to Siemens SITOP PSU100S, PSU200M, and PSU8600 power supply units without intermediate DC/DC conversion, simplifying the power distribution architecture and reducing component count.
• Cross-vendor IEEE 802.3 transparency: As a Layer 2 forwarding device, the switch passes frames from any IEEE 802.3-compliant device — Siemens or third-party — without protocol filtering, enabling mixed-vendor PROFINET segments and gradual migration from legacy fieldbus topologies.

Quality Assurance & Global Logistics

Every Siemens 6GK1105-2AB10 unit supplied by siemensplc.com is sourced through verified channels with full traceability to Siemens AG manufacturing. Each unit undergoes a pre-shipment inspection protocol that includes label and date-code verification, visual inspection for physical damage, and a functional power-on test confirming LED status indication and port link establishment. Units that do not pass inspection are quarantined and not dispatched.

Packaging follows anti-static and moisture-barrier standards: each unit is placed in an ESD-protective bag, cushioned with foam inserts, and sealed in a corrugated outer carton rated for international air and sea freight handling. For multi-unit orders, individual cartons are palletized and stretch-wrapped to prevent transit damage.

Shipments originate from our warehouse in Xiamen, China — a major port city with direct air freight connections to Frankfurt, Amsterdam, Los Angeles, Dubai, and Singapore. Standard international delivery times are 3–7 business days via DHL Express or FedEx International Priority. Sea freight consolidation is available for bulk orders. All export documentation — commercial invoice, packing list, certificate of origin, and ECCN classification — is prepared in-house and provided with every shipment. A 12-month warranty against manufacturing defects is included; DOA units are replaced within 7 business days of confirmed fault report.

Contact Information

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