Description
Bosch Rexroth CSH01.1C-SE-ENS-NNN-MD2-L2-S-NN-FW
Product Overview
The Bosch Rexroth CSH01.1C-SE-ENS-NNN-MD2-L2-S-NN-FW is an advanced control unit for the Bosch Rexroth IndraDrive platform. It is the control section installed with an IndraDrive power section, handling the drive-level control architecture rather than supplying the motor power directly. The exact ordering code specifies SERCOS II as the control communication interface, an ENS encoder interface, no Option 2 module, an MD2 digital I/O and SSI encoder interface in Option 3, and L2 Safe Torque Off. Bosch Rexroth’s ordering documentation defines these code positions explicitly.
For engineers maintaining an existing IndraDrive installation, the configuration string is more important than the generic CSH01.1C model number. Several CSH01.1C units look similar but have different encoder interfaces, I/O expansions, communication systems, and safety options. The CSH01.1C-SE-ENS-NNN-MD2-L2-S-NN-FW therefore should be treated as a specific configured control section rather than a universally interchangeable CSH controller. The MD2 option is particularly important when the machine uses an SSI encoder, while the L2 option identifies the Safe Torque Off configuration.
In practical machine-control work, this unit sits between the higher-level motion-control network and the IndraDrive power electronics. SERCOS provides the deterministic drive communication path, while the encoder interface and local I/O handle feedback and machine-level signals. The control unit itself does not replace the associated power section, motor, feedback device, or machine PLC.
For a legacy replacement, compare the complete type code character by character. Substituting a CSH01.1C with a different safety option or encoder configuration can create a commissioning problem even when the module physically fits the same drive architecture.
Product Introduction — Non-Templated
The important detail here is not simply . The final configuration specifies SERCOS II + ENS + MD2 + L2, creating a particular IndraDrive control architecture for single-axis motion applications.
That combination is relevant to legacy replacement work where the machine depends on both an SSI encoder interface and integrated Safe Torque Off. A generic .1C replacement is not sufficient unless its complete configuration matches the installed system.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Product Model | .1C-SE-ENS-NNN-MD2-L2-S-NN-FW |
| Manufacturer | Bosch Rexroth |
| Product Family | IndraDrive |
| Product Type | .1C Advanced Control Unit |
| Application | Single-axis drive and motion control |
| Control Communication | SERCOS II |
| Encoder Option | ENS |
| Option 1 | ENS — IndraDyn / Hiperface encoder interface family |
| Option 2 | NNN — Not equipped |
| Option 3 | MD2 — Digital I/O with SSI encoder interface |
| Safety Technology | L2 — Safe Torque Off |
| Operator Panel | S — Standard |
| Firmware | FW — firmware configuration; exact version must be verified |
| Material Number | R911332773 listed for this configuration |
| Control Supply | 24 VDC class for the .1C control unit |
| Installation | Plug-in control section within compatible IndraDrive power section |
| Communication Protocol | SERCOS II |
| Standalone Motor Power | Not provided by the control unit |
The Rexroth ordering guide defines SE = SERCOS II, ENS as the encoder interface for IndraDyn/Hiperface and related feedback systems, MD2 as digital I/O with SSI encoder interface, and L2 as Safe Torque Off.
A comparable .1C configuration published by an Indramat technical supplier specifies a 24 VDC control supply, approximately 7.5 W power consumption, and a compact 103 × 241 × 49.5 mm form factor. Those values are useful as .1C family context, but the exact electrical data for this complete ordering code should be confirmed against the installed hardware documentation before engineering substitution.
CSH01.1C-SE-ENS-NNN-MD2-L2-S-NN-FW
Major Features / Practical Advantages
1. SERCOS II Drive Communication
The SE position in the type code specifies SERCOS II control communication. SERCOS is the real-time communication layer used by the IndraDrive system for exchanging motion-related information between the controller architecture and drive.
This is not interchangeable with every CSH communication option. Rexroth also documented PROFIBUS, CANopen/DeviceNet, SERCOS III, Multi-Ethernet, and parallel-interface configurations within the CSH family.
2. ENS Encoder Interface
The ENS configuration provides the encoder-interface option associated with IndraDyn, Hiperface and related feedback devices in Rexroth’s ordering documentation.
Feedback compatibility is one of the first items to check during replacement. The motor can be mechanically identical while its feedback device requires a different CSH encoder interface.
3. MD2 Digital I/O and SSI Encoder Interface
The MD2 position is especially important in this part number. Rexroth defines MD2 as a digital I/O extension with SSI encoder interface.
That gives the control section a different field-interface capability from configurations using MA1 analog I/O, MEM encoder emulation, or NNN without an Option 3 module.
When an existing machine relies on SSI feedback, this option should be treated as part of the functional specification, not as an optional convenience.
4. Integrated Safe Torque Off
The L2 safety option identifies Safe Torque Off in the CSH ordering structure. Rexroth distinguishes L2 from S2 Safe Motion and NN without safety technology.
STO is a safety function that prevents torque-producing motor operation through the specified safety architecture. It should not be confused with removal of all electrical energy from the drive cabinet. DC-link voltage and other hazardous energy can remain present after STO is activated.
5. Standard Operator Panel Configuration
The S position identifies the standard operator-panel configuration within the ordering scheme. This is relevant when comparing a replacement against a machine’s existing local commissioning and diagnostic arrangement.
6. Modular IndraDrive Architecture
The .1C is a control section rather than the complete drive. Its physical installation is associated with an IndraDrive power section, where the control electronics, power electronics, motor feedback, communications, and safety functions operate as one drive system.
That modular design is useful for maintenance because the control section can be replaced without automatically replacing the power stage. It also creates a compatibility trap: the replacement control section must match the power section, firmware generation, motor data, encoder system, and safety architecture.
7. Configuration-Specific Replacement
Commercial catalogs list many .1C variants with only one or two type-code positions changed. For example, .1C-SE-ENS-NNN-MEM-L2-S-NN-FW and .1C-SE-ENS-NNN-MD2-L2-S-NN-FW are different configurations.
Do not approve a replacement based only on the first eight characters of the model number. The complete type code is the engineering specification.
Related Products
- .1C-SE-ENS-NNN-MD2-NN-S-NN-FW — Same general CSH/SERCOS/ENS/MD2 architecture but without the L2 safety option; not automatically equivalent.
- .1C-SE-ENS-NNN-MEM-L2-S-NN-FW — Uses MEM encoder-emulation functionality instead of the MD2 option; different feedback/interface architecture.
- .1C-SE-ENS-EN2-NNN-L2-S-NN-FW — Uses the EN2 encoder-interface configuration rather than MD2 in Option 3; suitable only where the feedback architecture matches.
- .1C-SE-ENS-NNN-MA1-S2-S-NN-FW — Adds analog I/O and uses S2 Safe Motion rather than L2 STO.
- .1C-S3-EN2-NNN-MEM-S2-S-NN-FW — SERCOS III / EN2 / MEM / Safe Motion configuration, representing a materially different CSH setup.
- Rexroth IndraDrive .1C — The broader Advanced Control Unit family containing multiple communication, encoder, I/O, and safety configurations.
- Rexroth IndraDrive power sections — Companion power-stage hardware into which the CSH control section is installed.
- Rexroth IndraDyn motors — Motor family associated with the ENS encoder-interface configuration.
FAQ
What is the Bosch Rexroth .1C-SE-ENS-NNN-MD2-L2-S-NN-FW?
It is a .1C Advanced Control Unit for the IndraDrive platform, configured for SERCOS II communication, ENS encoder feedback, MD2 digital I/O with SSI encoder capability, and L2 Safe Torque Off.
Is this a complete IndraDrive servo drive?
No. The .1C is the control section. It works with the appropriate IndraDrive power section and associated motor/feedback hardware. Replacing the control section alone does not provide the drive’s motor-power stage.
What does MD2 mean on this part number?
MD2 = Digital I/O with SSI encoder interface. It is the Option 3 configuration in the CSH ordering structure.
What does L2 mean?
L2 identifies Safe Torque Off in the Rexroth CSH ordering structure. It is different from S2 Safe Motion and from NN, which indicates no safety technology.
Does this support SERCOS III?
Not according to this exact type code. The SE designation specifies SERCOS II. Rexroth lists S3 separately for SERCOS III configurations.
Can I hot-swap the .1C?
Do not assume hot replacement. The control section belongs to an energized servo-drive system containing potentially hazardous DC-link and motor-circuit energy. Follow the machine’s lockout/tagout procedure and Rexroth maintenance instructions before removing the control section.
Does it require firmware configuration after replacement?
Potentially. The type code ends in FW, but that does not establish a specific firmware revision. The replacement should be checked against the installed IndraDrive firmware generation, parameter set, motor data, encoder configuration, and machine application before commissioning.
Can I replace it with any .1C?
No. This is one of the most important procurement points. .1C is a family designation; the complete type code controls communication, encoder, I/O, and safety configuration. Rexroth documentation lists numerous variants with materially different option combinations.
What material number is associated with this exact configuration?
The exact configuration is listed as R911332773 in a Rexroth/IndraDrive product catalog listing. Confirm the nameplate and ordering documentation on the physical unit before treating the material number as sufficient for substitution.
Is this suitable for a legacy IndraDrive replacement?
Potentially, provided the complete control configuration, power section, motor feedback, firmware generation, parameterization, and safety architecture match the existing machine. Physical fit alone is not enough.
Procurement Note
For a Bo replacement, verify the following before purchase:
- Exact complete type code:
- Bosch Rexroth material number: R911332773, if confirmed on the existing unit
- .1C hardware revision
- IndraDrive power-section model
- SERCOS II communication requirement
- ENS encoder configuration
- MD2 digital I/O and SSI encoder requirement
- L2 Safe Torque Off configuration
- Existing motor and encoder part numbers
- Installed firmware and parameter set
- Machine PLC / motion-controller configuration
- Safety validation requirements after replacement
A .1C with the wrong encoder option can be mechanically compatible and still fail at commissioning. The same applies to the safety option: L2 and S2 should not be treated as interchangeable simply because both belong to the CSH safety-option family.
For a legacy replacement, retain the original drive parameters and machine configuration before removing the existing control section. After installation, verify encoder feedback, SERCOS communication, safety inputs, STO behavior, motor identification data, and axis enable conditions before returning the machine to production.
