Siemens 6SN1118-0DK23-0AA2 — Detailed Product Profile

1. Product Overview

The Siemens 6SN1118-0DK23-0AA2 is a high-performance, two-axis digital control loop module from the SIMODRIVE 611 drive system. It is designed to provide closed-loop control for two axes in compatible industrial machine-tool and motion-control applications.

The module supports a direct measuring system using SIN/COS incremental encoder signals at 1 Vpp. This type of feedback allows the drive-control system to use position-related measurement signals for precise motion regulation when paired with compatible measuring equipment, drive hardware and control software.

Unlike a complete standalone servo drive, the 6SN1118-0DK23-0AA2 is a control module intended to be installed within a compatible SIMODRIVE 611 modular drive arrangement. It works as part of a larger system that includes suitable power modules, motors, feedback devices, wiring and numerical-control (NC) software.

The module is associated with legacy industrial equipment, particularly CNC machine tools and other machines that rely on coordinated motion across multiple axes. It can be important in maintenance and repair projects where replacing the original drive architecture would require substantial electrical, mechanical and software changes.

This model is listed as a spare part and was discontinued as a product in 2015. When selecting one for an existing machine, it is essential to verify the exact part number, hardware compatibility, NC software version and condition of the replacement unit.

2. Brand and Product Series

The SIMODRIVE 611 platform uses a modular architecture in which control and power functions are provided by compatible components. The control module is therefore not intended to operate independently of the corresponding drive hardware.

The term two-axis control means that the module is designed to handle two axes within a supported configuration. It does not mean that the module contains two complete independent power stages or can drive arbitrary motors without the appropriate power electronics.

3. Detailed Technical Parameters

3.1 General specifications

Important dimensional note: The approximate package dimensions above are for planning reference only. They must not be treated as confirmed module dimensions. The physical dimensions should be obtained from the mechanical drawing for the exact hardware version before designing a rack, checking clearances or arranging a replacement.

3.2 Axis and control functions

The module is designed for applications in which accurate control of more than one motion axis is needed. In a CNC machine, for example, separate axes may control the movement of a tool, table or other machine mechanism.

The actual positioning performance depends on the complete motion-control system, including the motor, power module, feedback device, mechanical transmission, tuning parameters and CNC configuration. The module’s high-performance designation alone does not establish a specific positioning accuracy or maximum speed for every installation.

3.3 Encoder and measuring-system specifications

A direct measuring system measures movement at the machine’s measuring location rather than relying exclusively on the motor’s internal feedback. Depending on the machine design, this can help account for movement between the motor and the working mechanism.

SIN/COS 1 Vpp feedback is an analog incremental signal format. It is different from digital encoder interfaces and from other feedback technologies. Before connecting a measuring device, verify its signal type, amplitude, connector, cable arrangement and compatibility with the drive system.

3.4 System compatibility

The module should be treated as a component in a matched drive system. Its physical fit alone is not sufficient to establish compatibility. Differences in control performance, feedback interfaces, software requirements and hardware revisions can affect whether a replacement operates correctly.

3.5 Electrical, thermal and installation considerations

The control module should be installed only within a compatible drive arrangement and in accordance with the applicable safety and electrical procedures. Drive systems may contain hazardous voltages and stored electrical energy even after the incoming supply has been disconnected. Qualified personnel must follow the prescribed isolation and discharge procedure before handling the equipment.

3.6 Dimensions and weight

The module is a plug-in component, so its installation envelope is determined by the compatible drive chassis as well as the component itself. For a replacement project, the original module’s slot, insertion direction, connector arrangement and surrounding clearance should be checked before ordering.

4. Product Introduction

The 6SN1118-0DK23-0AA2 is a high-performance digital control module designed for two-axis motion control within the SIMODRIVE 611 platform. Its primary role is to process motion-control and feedback information for compatible drive axes, working with the system’s power electronics and numerical-control software.

In a CNC machine, accurate motion depends on more than the motor itself. The controller must interpret position feedback, regulate movement and coordinate the axis with the machine’s wider control system. The 6SN1118-0DK23-0AA2 provides part of that control function in a modular drive architecture.

The direct measuring system support is an important feature. A compatible SIN/COS 1 Vpp measuring device can provide position-related feedback from the machine’s measurement location. Depending on the mechanical design, direct measurement can help the control system account for movement at the machine axis rather than relying only on motor-side feedback.

The high-performance control category makes this module relevant to machines with demanding motion requirements. Typical examples include CNC machine tools, machining centres and production equipment where controlled movement, repeatability and coordination between axes are important.

However, the module is not a complete servo drive. It requires compatible SIMODRIVE 611 power hardware, suitable motors, the appropriate feedback system and the required NC software. The overall system must be commissioned and tested as a complete installation.

The model has also become a maintenance-oriented product because it is discontinued. In a legacy machine, retaining a compatible module may be less disruptive than redesigning the entire drive system. Before installing a replacement, the exact model, firmware or hardware revision, software version, motor configuration and measuring-system interface should be checked.

5. Product Applications

5.1 CNC machine tools

The module is suitable for compatible CNC machine-tool systems that need two-axis closed-loop control. Typical applications include coordinated movement of a tool and workpiece, axis positioning and other motion tasks managed by the machine’s NC system.

Its role is to support the drive-control portion of the machine architecture. The final accuracy and dynamic performance depend on the full system, including mechanical rigidity, drive tuning, encoder resolution and the NC program.

5.2 Milling and machining centres

Milling machines and machining centres often require precise, repeatable movement across multiple axes. A two-axis control module may form part of the drive arrangement for selected machine axes, provided the system configuration supports the required motion functions.

For example, the module may be used in an existing machine where two compatible axes are controlled through a SIMODRIVE 611 drive system. The actual axis assignment depends on the original machine design.

5.3 Turning and lathe equipment

CNC turning equipment requires controlled motion between the cutting tool and the workpiece. In a compatible system, a high-performance two-axis control module can support the motion functions assigned to its configured axes.

Whether the module is appropriate for a specific lathe depends on the motor type, drive configuration, feedback system and NC software. It should not be assumed to suit every spindle or feed-axis application without checking the system documentation.

5.4 Precision positioning systems

Industrial positioning systems may need to move a mechanical assembly to defined positions with repeatable feedback. The direct measuring-system interface can be useful where the machine design uses a compatible SIN/COS 1 Vpp measuring device.

Applications can include positioning slides, machine tables and other mechanisms that are part of a compatible drive architecture. Performance depends on the mechanical transmission, feedback installation, control parameters and operating conditions.

5.5 Multi-axis industrial machinery

Some industrial machines coordinate several axes that perform different parts of a manufacturing process. The two-axis capability can help organize the control functions into modules within a larger SIMODRIVE 611 system.

The module should be selected according to the required number of axes, performance level and feedback interface. A machine with different axis types or more extensive motion requirements may need additional or different control modules.

5.6 Legacy machine maintenance

Because the product has been discontinued, a common reason for using this model is maintaining an existing machine. A compatible replacement may help preserve the established electrical design, drive configuration and NC system.

This can reduce the scope of a repair compared with replacing the entire drive architecture. However, a replacement module must be tested and configured correctly, and the availability and condition of the part should be evaluated carefully.

5.7 Retrofit and refurbishment projects

During a machine refurbishment, the module may be retained if the existing SIMODRIVE 611 architecture remains suitable and compatible components are available.

If the machine is being modernized, the choice between retaining the original system and moving to a newer drive platform should consider downtime, spare-part availability, engineering costs, required performance and long-term maintenance.

6. Main Product Advantages

6.1 Two-axis control capability

The module supports two controlled axes in a compatible system. This can help reduce the number of separate control modules required for certain machine configurations, depending on the architecture and the axis requirements.

6.2 High-performance control category

Its high-performance designation makes it relevant to motion-control applications where dynamic response and precise axis regulation are important. Actual performance still depends on the motor, feedback device, power module, mechanical system and tuning.

6.3 Direct measuring-system support

The ability to use a compatible SIN/COS 1 Vpp direct measuring system is useful in machine designs that measure position at the machine axis. This can help the control system account for mechanical movement between the motor and the working mechanism.

The benefit depends on correct installation, encoder compatibility and the control system’s configuration.

6.4 Integration with a modular drive system

The module fits into the SIMODRIVE 611 architecture, where control and power components are arranged as part of a larger drive system. This modular design allows the control hardware to be selected according to the application’s axis and performance requirements.

6.5 Useful for maintaining existing CNC machinery

For legacy equipment, retaining the original control module may avoid a more extensive conversion. The machine may be able to continue using its established power electronics, motor wiring and NC configuration when the replacement is fully compatible.

6.6 Compact plug-in format

The module is designed for installation within a compatible drive chassis rather than as a separate standalone enclosure. This supports the modular layout of the drive system and can simplify replacement when the chassis and connectors are in good condition.

6.7 Established industrial motion-control architecture

The SIMODRIVE 611 platform has been used in industrial motion-control applications. For a machine that was originally engineered around this platform, preserving the same architecture can reduce the number of changes required during a maintenance repair.

6.8 Potential reduction in retrofit disruption

A verified replacement module can be less disruptive than changing the complete drive system. This is especially relevant when the machine’s mechanical components, NC program and surrounding automation are still serviceable.

The advantage is conditional: the replacement must be compatible, functional and supported by an appropriate maintenance and commissioning process.

7. Five Related Models from the Same Series

The following models belong to the SIMODRIVE 611 digital control-loop family or are closely related variants. They differ in axis count, performance category or hardware revision, so they must not be treated as interchangeable solely because their part numbers are similar.

Dimensions and weights marked for verification are intentionally not estimated as confirmed product data. The modules are plug-in components, and the exact mechanical drawing and installed drive configuration should be checked before replacement.

7.1 6SN1118-0DK23-0AA0 — Earlier two-axis variant

This model is closely related to the target module and belongs to the same general high-performance, two-axis control-loop family. It may be relevant when investigating the history of a machine’s original hardware or comparing earlier and later revisions.

It should not automatically be treated as a drop-in replacement for the -0AA2 version. Check the complete order number, software requirements, feedback interface and system compatibility before selecting it.

7.2 6SN1118-0DK21-0AA2 — Related two-axis control module

This is another high-performance, two-axis SIMODRIVE 611 control module. It may be worth comparing when the maintenance requirement concerns a two-axis drive arrangement.

The suffix differences matter. The exact measuring-system support, configuration and compatibility with the existing NC software should be verified before substitution.

7.3 6SN1118-0DJ23-0AA2 — Single-axis high-performance module

This model is intended for a single controlled axis rather than two. It may be relevant to a machine architecture in which each control module handles one axis separately.

Because the number of axes differs, it is not an equivalent replacement for the target module in a two-axis configuration without a broader redesign.

7.4 6SN1118-0DJ21-0AA2 — Related single-axis module

This is another single-axis high-performance variant within the same family. It may be useful for comparing control arrangements or maintaining machines originally designed around individual axis modules.

The exact hardware and software compatibility should be confirmed. A related family designation alone does not guarantee identical feedback support or configuration behaviour.

7.5 6SN1118-0DM33-0AA2 — High-standard two-axis module

This module provides a related two-axis control option but belongs to the high-standard rather than high-performance category. It may be relevant when reviewing a different original system configuration.

It should not be selected as a substitute simply because it controls two axes. The required performance class and measuring-system functions must match the machine’s requirements.

8. Five Popular Models from the Same Brand

The following models cover several established industrial automation and drive product categories. They are useful for comparing a legacy SIMODRIVE 611 installation with other automation options, but they are not direct replacements for the 6SN1118-0DK23-0AA2.

The dimensions and weights above are approximate selection figures where provided. Verify the exact product revision and technical data before designing an enclosure or ordering a replacement.

8.1 6SL3120-1TE21-8AA3 — SINAMICS S120

The SINAMICS S120 family is a modular drive platform used in demanding motion-control applications. It may be considered when planning a modernization of an older drive system, particularly when the project requires a different drive architecture or additional integration capabilities.

A conversion from SIMODRIVE 611 to SINAMICS S120 is not a simple module swap. It normally requires a review of the drive hardware, motors, feedback devices, control system, parameterization, safety functions and machine commissioning plan.

8.2 6SL3210-1KE21-3AF1 — SINAMICS G120C

The SINAMICS G120C is a compact drive intended for compatible motor-speed control tasks. It is generally suited to applications such as pumps, fans, conveyors and other machinery where variable-frequency motor control is required.

It does not perform the same function as a two-axis SIMODRIVE 611 closed-loop control module. Selection should be based on the motor rating, required control mode, supply voltage and application requirements.

8.3 6ES7214-1AG40-0XB0 — SIMATIC S7-1200

The S7-1200 is a compact PLC platform for machine control and general automation. It can be relevant where the modernization project also involves changing the machine’s logic controller or integrating additional I/O and communication functions.

It is not a direct replacement for the 6SN1118-0DK23-0AA2. Drive control, motion functionality and CNC integration would need to be addressed by an appropriate drive and control architecture.

8.4 6ES7511-1AK02-0AB0 — SIMATIC S7-1500

The S7-1500 is a modular controller for more demanding automation applications. It may be useful as part of a broader machine-control modernization, particularly where the original controller is also being reviewed.

A suitable motion-control system would still be required. The PLC model alone does not replace the target module’s dedicated drive-control functions.

8.5 6EP1333-2BA20 — SITOP power supply

An industrial power supply is a supporting component rather than a drive-control replacement. It provides power for compatible control equipment and other loads within its specified ratings.

When selecting a power supply for a modernized machine, calculate the total load and verify voltage, current, protection and redundancy requirements. The SIMODRIVE power architecture must be designed according to the drive system’s own electrical specifications.

9. Installation, Replacement and Maintenance Considerations

Before replacing or installing the 6SN1118-0DK23-0AA2, review the following points.

1. Confirm the exact order number. The final suffix can distinguish hardware revisions and supported functions. Do not rely only on the SIMODRIVE 611 family name.

2. Check the required software version. This model specifies NC software from version 06.04.09. Confirm the software installed in the machine and its compatibility with the replacement module.

3. Verify the measuring system. The specified direct measuring arrangement uses SIN/COS 1 Vpp feedback. Confirm the encoder type, signal amplitude, cable and connector arrangement.

4. Check the number of axes. The target module is a two-axis unit. A single-axis module is not an equivalent replacement unless the overall drive architecture is changed appropriately.

5. Inspect the complete drive system. Confirm compatibility with the installed power module, motor, feedback equipment and control hardware.

6. Verify the mechanical installation. Obtain the exact mechanical drawing and confirm the correct slot, mounting arrangement, connector position and required clearance.

7. Review the module’s condition. Because the product is discontinued, assess storage history, visible damage, connector condition and test results when considering a used or refurbished unit.

8. Back up the existing machine parameters. Preserve the NC configuration, drive parameters and machine-specific settings before removing the original module.

9. Follow electrical safety procedures. Isolate the system, prevent unexpected restart and follow the prescribed discharge procedure before working on drive hardware.

10. Commission and test the complete machine. Verify feedback direction, axis assignment, control response, alarms, interlocks and relevant safety functions before returning the machine to production.

11. Plan for long-term maintenance. Assess the availability of compatible spare parts, engineering tools and specialist support. If the machine is business-critical, a longer-term modernization plan may be appropriate.

10. Final Assessment

The Siemens 6SN1118-0DK23-0AA2 is a high-performance, two-axis digital control loop module for the SIMODRIVE 611 platform. Its principal characteristics are two-axis closed-loop control, support for a direct SIN/COS 1 Vpp measuring system and integration into a compatible CNC drive architecture.

The module is most relevant to legacy CNC machinery and industrial motion-control systems that already use compatible SIMODRIVE 611 hardware. Retaining the original platform can reduce retrofit work when the machine remains serviceable and the required replacement components are available.

The main limitation is its discontinued status. Before purchasing a replacement, verify the exact hardware revision, NC software requirements, measuring-system compatibility and physical installation arrangement. Its weight is approximately 0.530 kg, but the exact physical dimensions should be confirmed from the module’s mechanical drawing rather than inferred from package measurements.

For an existing machine, a verified compatible replacement is often the least disruptive maintenance option. For a larger modernization project, compare the cost and risk of retaining SIMODRIVE 611 with the engineering work required to migrate to a newer drive platform.