Bosch Rexroth CSH01.1C-SE-EN2-NNN-NNN-NN-S-NN-FW Servo Drive Control Unit – IndraDrive Cs

Bosch Rexroth CSH01.1C-SE-EN2-NNN-NNN-NN-S-NN-FW — Single-Axis Servo Drive Control Section for Precision Multi-Axis Motion Architectures

The CSH01.1C-SE-EN2-NNN-NNN-NN-S-NN-FW is the control section of Bosch Rexroth’s IndraDrive Cs platform — a modular, compact servo drive family engineered for machine designs where axis density, cabinet thermal load, and inter-axis synchronization tolerance are primary constraints. Unlike integrated drive units, the IndraDrive Cs topology separates the control section (CSH) from the power section (HCS supply module), allowing independent replacement of either layer without disturbing the DC bus wiring or motor cable routing. This architecture directly reduces mean time to repair (MTTR) in production environments where unplanned downtime carries measurable cost.

The CSH01.1C designation encodes the following hardware configuration: Cs-series platform, single-axis control, variant C — the broadest feedback and safety option set within the Cs family. The SE field identifies the standard encoder interface complement. The EN2 field specifies the dual-protocol fieldbus interface: SERCOS II ring and EtherNet, implemented on physically separate silicon to prevent protocol-layer interference. The trailing FW suffix confirms factory-loaded firmware, bypassing the firmware provisioning step during initial commissioning and reducing per-axis setup time in multi-axis machine builds.

This control unit is actively stocked at our Xiamen, China distribution facility and available for immediate international dispatch. It serves MRO replacement, OEM spare parts programs, and machine modernization projects across packaging, printing, semiconductor handling, and precision assembly sectors.

Real-time Stock & RFQ: [email protected] | WhatsApp: +86 18359268345

Technical Parameters

Hardware Logical Analysis

The CSH01.1C-SE-EN2-NNN-NNN-NN-S-NN-FW implements a three-tier closed-loop processing hierarchy, each tier executing on dedicated silicon with no shared scheduling resources between layers.

Current regulation layer (62.5 µs): A fixed-point DSP executes the current control algorithm at 62.5 µs, independent of fieldbus activity. Phase current measurements from the power section are sampled via isolated ADC inputs, and the PWM duty cycle commands are updated each cycle. Because this layer runs on a hardware timer interrupt with no operating system preemption, torque response latency is bounded and deterministic — a property that directly governs the drive’s ability to suppress mechanical resonance in high-stiffness load configurations.

Velocity and position layer (250 µs / 1 ms): The velocity estimator runs at 250 µs, synchronized to the SERCOS II Master Synchronization Telegram (MST) via a hardware interrupt. This synchronization mechanism — not a software polling loop — is what allows multiple CSH01.1C units on the same SERCOS ring to maintain inter-axis phase alignment within 1 µs. The position interpolator operates at 1 ms in standard mode and at 250 µs in cyclic synchronous position (CSP) mode, the latter required for electronic cam and gearing applications where position command latency directly affects profile fidelity.

EN2 dual-protocol fieldbus architecture: The SERCOS II interface is implemented on a dedicated ring management ASIC that handles telegram framing, CRC validation, and MST generation in hardware. The EtherNet stack runs on a separate processor core with its own memory space. This physical isolation means that EtherNet broadcast traffic, TCP retransmissions, or network congestion events have zero effect on SERCOS II cycle timing — a design constraint that becomes critical in machine architectures where both protocols coexist on the same control cabinet.

Feedback interface and absolute position management: The SE encoder interface supports protocol auto-detection at power-up. EnDat 2.2 absolute encoders are queried via a synchronous serial channel clocked at up to 16 MHz, returning single-turn and multi-turn absolute position data within the first SERCOS cycle after power-on. This eliminates the homing sequence entirely for axes equipped with absolute encoders — a significant operational advantage on vertical axes, rotary tables, and any axis where uncontrolled motion during a reference run creates a collision or safety risk.

EMC and isolation architecture: Control section PCBs use a four-layer stackup with dedicated internal ground planes. All signal paths crossing the isolation boundary between the control domain and the DC bus measurement inputs are routed through digital isolators rated for reinforced insulation per IEC 61800-5-1. Transient voltage suppression (TVS) diodes protect the ADC measurement inputs from bus voltage spikes generated during regenerative braking events on adjacent axes sharing the same DC bus segment.

Integrated safety logic: The STO function disconnects the gate drive signals to the power section IGBTs via a dual-channel hardware path that does not pass through the main control processor. This architecture satisfies the diagnostic coverage requirements for SIL 2 / PLd without requiring a separate safety relay on the motor power circuit. SS1, SS2, SOS, and SLS functions are implemented in the safety firmware partition, which executes on a separate processor core with cross-monitoring against the main application firmware.

System Integration Benefits

• Sub-microsecond inter-axis synchronization: Hardware MST-triggered interrupt architecture locks all CSH01.1C units on the SERCOS ring to a common time base. Phase error between axes remains below 1 µs across the full speed range, enabling electronic gearing ratios and cam profiles that are stable under load transients.
• Dual-protocol fieldbus reduces spare parts complexity: A single CSH01.1C-SE-EN2 unit operates under SERCOS II in legacy machine architectures or EtherNet-based protocols in modernized topologies. Mixed-generation machine fleets can standardize on one control unit SKU rather than maintaining separate inventories for each protocol variant.
• Absolute encoder support eliminates homing cycles: EnDat 2.2 and Hiperface absolute feedback provides machine position at power-on without a reference run. This removes homing time from the machine startup sequence and eliminates the collision risk associated with uncontrolled axis motion during reference travel.
• On-board SIL 2 / PLd safety removes external relay hardware: STO, SS1, SS2, SOS, and SLS are certified to IEC 62061 SIL 2 and ISO 13849 PLd. The safety architecture is contained within the drive, eliminating external safety contactors on the motor power circuit and reducing cabinet wiring complexity and failure point count.
• Factory firmware eliminates commissioning provisioning step: The FW variant ships with firmware pre-loaded and verified. IndraWorks DS connects directly for parameter upload without a prior firmware download session, reducing per-axis commissioning time by 15–30 minutes in multi-axis builds.
• Structured diagnostic log with timestamp history: The drive maintains a fault log with timestamps, operating hour counters, and thermal load history accessible via the USB service interface or fieldbus. This data supports predictive maintenance scheduling without additional monitoring hardware or software licenses.
• Drop-in replacement with parameter restore: The CSH01.1C-SE-EN2 maintains full backward compatibility with existing IndraDrive Cs power sections and motor cable sets. Parameter files backed up from the replaced unit restore directly, limiting re-commissioning scope to a functional verification test rather than a full parameterization cycle.
• DC bus energy sharing across axes: Multiple CSH01.1C units sharing a common HCS supply module DC bus segment exchange regenerative energy between axes in real time — a decelerating axis feeds kinetic energy back to an accelerating axis on the same bus, reducing net energy draw from the supply module and lowering heat dissipation within the cabinet enclosure.
• Modular topology enables independent layer replacement: The physical separation of control section (CSH) and power section (HCS) means a failed control board is replaced without disturbing DC bus connections, motor cables, or power section wiring. This reduces the mechanical scope of a repair event and lowers the risk of introducing wiring errors during maintenance.

Quality Assurance & Global Logistics

All units supplied through siemensplc.com are sourced via verified industrial automation procurement channels. Bosch Rexroth’s IndraDrive Cs manufacturing process operates under ISO 9001 quality management certification. Each CSH01.1C-SE-EN2-NNN-NNN-NN-S-NN-FW unit undergoes the following pre-dispatch verification protocol at our Xiamen facility:

• Part number field verification: Each of the 18 fields in the Rexroth ordering code is individually confirmed against the physical label and the internal identification data readable via the USB service interface. Partial matches or label discrepancies result in quarantine and escalation — no unit ships on a visual-only check.
• Physical condition assessment: Housing integrity, connector pin geometry, label legibility, and absence of evidence of prior installation (wear marks on connector housings, residue on PCB connectors) are assessed before packaging.
• ESD-compliant packaging: Control electronics are sealed in ANSI/ESD S541-compliant anti-static bags, cushioned with conductive foam, and packed in double-wall corrugated cartons rated for international air and sea freight handling per ISTA 2A.
• Export documentation package: Commercial invoice, packing list, certificate of origin, and HS code classification documentation are prepared for all international shipments, supporting customs clearance in the destination country without additional documentation requests.

Our logistics hub in Xiamen, China connects directly to international air freight services via Xiamen Gaoqi International Airport (XMN) and sea freight via Xiamen Port. Typical delivery windows: 3–5 business days by air to Europe, Southeast Asia, and the Middle East; 5–7 business days to North America. DHL Express, FedEx International Priority, and UPS Worldwide Express are available for time-critical requirements. Shipment tracking numbers are provided within 24 hours of dispatch confirmation.

Contact Information

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