Siemens SCALANCE X Modules - 6GK5991-1AF00-8AA0

Technical Dossier

Product Details And Specifications

Siemens SCALANCE X Series Technical Notes

The Evolution of SCALANCE X Architecture

The SCALANCE X product line was introduced by Siemens in the early 2000s as a purpose-built industrial Ethernet switch family to replace legacy PROFIBUS segment couplers in factory and process automation. The first generation (SCALANCE X-100/X-200 unmanaged and managed switches) established the DIN-rail form factor and 24 VDC power input standard that persists across all subsequent generations.

The second architectural generation introduced fiber optic uplink ports and SFP transceiver slots, enabling long-distance backbone connections within plant networks — a requirement driven by the physical scale of refineries and power generation facilities. The 6GK5991-1AF00-8AA0 fiber optic transceiver module belongs to this generation, providing 100 Mbit/s multimode fiber connectivity for SCALANCE X-200 and X-300 managed switches.

The third generation (SCALANCE X-500 / XM-400 series) introduced modular chassis architecture, Layer 3 routing capability, and IEC 62443 cybersecurity compliance — addressing the convergence of OT and IT networks in modern industrial facilities. Compatibility between generations is maintained at the SFP slot level, but management software (SINEMA) and firmware versions must be aligned when mixing generations in a single ring topology. End-of-sale notices for the X-100 and X-200 unmanaged lines were issued between 2018 and 2022; however, Siemens continues to provide spare parts and firmware security patches under its Industry Services long-term support program through 2028.

SCALANCE X Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly stocked models across the SCALANCE X product family.

Fiber Optic Transceivers & Media Converters

• 6GK5991-1AF00-8AA0: 100BASE-FX multimode SFP transceiver, 2 km range, LC duplex connector, for SCALANCE X-200/X-300 SFP slots.
• 6GK5991-2AB00-8AA0: 100BASE-LX10 single-mode SFP transceiver, 10 km range, LC duplex, extended-reach backbone uplink.
• 6GK5991-1AE00-8AA0: 100BASE-FX multimode SFP, 2 km, ST connector variant for legacy fiber patch panel compatibility.
• 6GK5991-2AF00-8AA0: 1000BASE-SX Gigabit multimode SFP, 550 m range, LC duplex, for SCALANCE X-300/X-500 Gigabit uplink slots.
• 6GK5991-2AH00-8AA0: 1000BASE-LX Gigabit single-mode SFP, 10 km range, LC duplex, inter-building backbone.

SCALANCE X-200 Managed Switches

• 6GK5208-0BA10-2AA3: SCALANCE X208, 8-port 10/100 Mbit/s managed switch, DIN-rail, 24 VDC, PROFINET IO device.
• 6GK5208-0HA10-2AA6: SCALANCE X208PRO, 8-port managed switch with M12 connectors, IP65/67, harsh environment cabinet-free mounting.
• 6GK5216-0BA00-2AA3: SCALANCE X216, 16-port 10/100 Mbit/s managed switch, DIN-rail, MRP ring redundancy support.
• 6GK5224-0BA00-2AA3: SCALANCE X224, 24-port managed switch, VLAN, QoS, SNMP, suitable for large cell-level networks.

SCALANCE X-300 Managed Switches

• 6GK5308-2FL10-2AA3: SCALANCE X308-2, 8-port managed switch with 2x SFP Gigabit uplink slots, Layer 2, MRP/RSTP.
• 6GK5316-0GE00-3AA3: SCALANCE X316, 16-port managed switch, 2x SFP uplinks, extended temperature -40°C to +70°C.
• 6GK5324-0GE00-3AR3: SCALANCE X324, 24-port managed switch, redundant 24/48 VDC power inputs, PROFINET IRT capable.

SCALANCE XM-400 Modular Switches

• 6GK5400-0AR00-2AA2: SCALANCE XM408-8C, modular 8-port base unit, expandable to 24 ports via media modules, Layer 2/3.
• 6GK5408-8GR00-2AM2: SCALANCE XM408-8C L3, Layer 3 routing module variant, static and dynamic routing (OSPF, RIP), for plant backbone.

SCALANCE X-500 High-Performance Switches

• 6GK5526-8GS00-3AR2: SCALANCE XC526-8C, 24-port Gigabit managed switch, 4x SFP+ 10G uplinks, IEC 62443-4-2 certified.
• 6GK5548-0AA00-2AR2: SCALANCE XR528-6M, 19-inch rack-mount modular switch, up to 28 ports, redundant power supply slots, for control room backbone.

Sourcing Hard-to-Find & Obsolete SCALANCE X Parts

The SCALANCE X-100 unmanaged series and early X-200 managed variants reached end-of-sale between 2018 and 2022. For plants operating on 15–25 year maintenance cycles — standard in nuclear, petrochemical, and water treatment infrastructure — this creates a structural spare parts gap that OEM channels cannot fill.

Quality Control for the SCALANCE X Range

SCALANCE X modules present specific test challenges due to their managed backplane architecture and fiber optic interface requirements. DriveKNMS applies the following verification protocol to all SCALANCE X units prior to dispatch: