Bosch Rexroth XM2100.01-01-31-31-301-NN-100N3NN Motion Control Module – IndraMotion MLC/MTX

Bosch Rexroth XM2100.01-01-31-31-301-NN-100N3NN (R911345644) — Embedded Trajectory Processor for Coordinated Servo Motion in IndraMotion MLC/MTX Systems

The XM2100.01-01-31-31-301-NN-100N3NN is a PC-based embedded motion control module manufactured by Bosch Rexroth under part number R911345644. Within the IndraMotion MLC and MTX control architecture, this module occupies the role of the primary trajectory computation and task execution engine. It processes IEC 61131-3 PLC programs and CNC interpolation kernels concurrently on a single x86-class embedded processor, coordinating position, velocity, and torque setpoints across multiple servo axes via a SERCOS III isochronous fieldbus ring.

The order code structure of the XM2100 series is deterministic: each alphanumeric segment maps to a validated hardware or firmware option. In this specific configuration, the dual “31” segments at positions 4 and 5 of the order code designate a dual-port SERCOS III ring interface — enabling ring redundancy with automatic topology reconfiguration. The “301” block defines the onboard digital I/O complement operating at 24 VDC logic levels. The trailing “100N3NN” suffix encodes the memory configuration and firmware variant, determining the maximum axis count and available CNC feature set under the installed license.

This module is suited for machine tool controllers, packaging line coordinators, and multi-axis assembly systems where deterministic cycle execution and tight axis synchronization are non-negotiable engineering requirements. Its consolidated architecture — combining servo master, PLC runtime, and CNC kernel in one unit — eliminates the inter-controller communication latency that characterizes distributed motion topologies.

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Technical Parameters

Hardware Logical Analysis

Dual-Processor Architecture and Task Isolation: The XM2100 module separates application execution from fieldbus communication at the silicon level. The application processor handles IEC 61131-3 task scheduling and CNC path interpolation at PLC cycle rates (typically 1–4 ms), while a dedicated SERCOS III co-processor manages isochronous telegram generation and reception at the servo cycle rate (250 µs–2 ms). This physical separation ensures that application logic overruns — caused by complex motion programs or heavy PLC scan loads — cannot preempt fieldbus telegram timing. The result is a servo cycle that remains deterministic regardless of application layer activity, a property that single-processor architectures cannot guarantee without strict worst-case execution time (WCET) analysis on every firmware update.

SERCOS III Ring Redundancy Mechanism: The dual-port ring interface (“31-31” in the order code) implements hardware-level ring fault tolerance. Under normal operation, the SERCOS III ring master transmits telegrams clockwise through the primary port; all slaves echo the telegram and the ring closes at the secondary port. Upon detection of a cable break or slave dropout — identified within a single SERCOS cycle (≤2 ms) by the absence of the closing telegram — the ring master autonomously switches to a linear topology using both ports simultaneously, effectively splitting the ring at the fault point and maintaining communication with all reachable slaves. This reconfiguration is transparent to the motion application: no axis trip, no program interrupt, no operator intervention required.

EMC Design Discipline: The module’s PCB follows Rexroth’s internal EMC layout rules: continuous ground planes across all signal layers, differential pair routing with controlled impedance (100 Ω ±10%) for SERCOS III lines, and multi-stage LC filtering on the 24 VDC supply rail. The backplane connector employs a multi-point shield contact scheme that bonds the module chassis to the cabinet ground rail at multiple points, suppressing common-mode currents induced by adjacent variable-frequency drives. This design approach targets the 150 kHz–30 MHz conducted emission band — the primary interference source in servo drive cabinets — without relying on external EMC filters.

Retain Memory and Power-Loss Data Integrity: The “100N3NN” memory configuration includes battery-backed SRAM or FRAM (variant-dependent) for retain variable storage. PLC retain data, axis parameter sets, and active CNC program variables survive a power interruption without requiring an external UPS. On power restoration, the module resumes from its last consistent state, bypassing the re-initialization sequences that non-retain architectures require. In facilities with unstable grid power, this characteristic directly reduces unplanned downtime caused by parameter loss.

Thermal Throttling Threshold: The embedded processor’s thermal management firmware sets the throttling onset above the module’s rated 55 °C ambient ceiling. Within the full operating temperature range, the processor sustains its nominal clock frequency without frequency scaling. This is a measurable distinction from platforms that reduce clock speed at elevated ambient temperatures, which introduces variable PLC scan times and complicates WCET validation in safety-rated applications.

System Integration Benefits

• Isochronous Axis Synchronization: SERCOS III delivers position and velocity setpoints to all connected IndraDrive axes within a single isochronous cycle, with inter-axis timing jitter below ±1 µs. Electronic gearing and cam profiling applications depend on this property — phase error between axes caused by non-deterministic communication directly produces dimensional defects in the workpiece.
• Single-Tool Engineering Workflow: IndraWorks DS consolidates drive parameterization, motion program development, PLC logic editing, and real-time oscilloscope trace capture in one software environment. Eliminating separate tools for drive and controller configuration removes the version-compatibility matrix that complicates commissioning when software packages are maintained independently.
• License-Based Axis Scaling: Axis count expansion is activated via software license keys applied to the existing hardware. A machine builder can standardize on a single hardware BOM across a product range and differentiate configurations through licensing — reducing warehouse SKU count and enabling field upgrades without hardware replacement.
• Integrated Functional Safety Without External Relays: Safety-capable firmware variants support STO, SS1, and SLS functions via the SERCOS III Safety-over-IP (S/IP) protocol. Safety functions are executed within the drive, validated against the controller’s safety program, and certified to SIL 2 / PLd — eliminating the per-axis external safety relay wiring that adds panel space and failure points.
• OPC UA Diagnostic Interface: The module exposes axis-level process data — following error, velocity deviation, drive thermal load, and SERCOS telegram error counters — via an integrated OPC UA server. Condition monitoring systems and MES platforms can subscribe to this data without custom protocol adapters, enabling predictive maintenance workflows based on real drive telemetry.
• Concurrent Fieldbus Master Roles: The XM2100 can operate as a PROFIBUS DP master or PROFINET IO controller simultaneously with its SERCOS III servo master function. Legacy I/O subsystems, barcode readers, and third-party vision systems on PROFIBUS can be integrated into the motion program without a separate gateway module or additional controller hardware.
• Priority-Scheduled CNC and PLC Co-execution: The CNC interpolation kernel executes at the servo cycle rate as the highest-priority task. IEC 61131-3 PLC tasks execute at configurable intervals (1–100 ms) in lower-priority slots. This scheduling model eliminates the communication overhead between a dedicated CNC controller and a separate PLC — a latency source that limits achievable path accuracy in high-speed contouring applications.
• 10-Year Post-Discontinuation Spare Part Commitment: Bosch Rexroth’s lifecycle management policy guarantees spare part availability and firmware support for a minimum of 10 years after series discontinuation. For machine builders supplying equipment under 15–20 year service contracts to automotive or aerospace OEMs, this commitment is a contractual procurement requirement that eliminates the risk of mid-lifecycle controller obsolescence.

Quality Assurance & Global Logistics

Each XM2100.01-01-31-31-301-NN-100N3NN unit shipped from our Xiamen, China facility is subject to a structured pre-dispatch verification process. The Rexroth part number R911345644 and the unit serial number are cross-referenced against manufacturer traceability records to confirm production batch authenticity. Physical inspection covers connector contact integrity, label verification (including holographic security elements where present on the unit), and firmware version confirmation. No unit is dispatched without passing this protocol.

Packaging follows IEC 60068-2-27 shock and IEC 60068-2-6 vibration handling standards for sensitive electronics: ESD-safe anti-static inner bag, conductive foam insert cut to module geometry, and double-wall corrugated outer carton rated for international air freight drop and compression loads. High-value or multi-unit orders are available in wooden crate packaging with internal foam suspension on request.

Outbound logistics from Xiamen operates via DHL Express, FedEx International Priority, and UPS Worldwide Express. Typical transit times: 2–4 business days to Europe and North America; 1–3 business days to Southeast Asia, Japan, and South Korea. A tracking number is issued within 24 hours of dispatch confirmation. Export documentation — commercial invoice, packing list, certificate of origin, and EORI-compliant customs declaration for EU destinations — is prepared as standard. Certificate of Conformance (CoC) and incoming inspection test reports are available on request for quality-critical procurement processes.

All units are covered by a 12-month warranty against manufacturing defects, measured from the dispatch date. Warranty claims are handled directly by our technical team; defective units are replaced or credited within agreed lead times without third-party intermediary delays.

Contact Information

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