Product Overview

The Siemens 6SN1118-0DG23-0AA1 is a SIMODRIVE 611-D closed-loop plug-in performance control unit for one axis in digital feed-drive and main-spindle-drive applications. It is specified for use with a direct measuring system and voltage signals, making it suitable for compatible CNC drive configurations that require this particular measurement interface.

Within the SIMODRIVE 611-D architecture, the control unit manages the drive-control functions for its assigned axis. It works alongside the associated power module, motor, feedback equipment, and numerical control system. The power module supplies the electrical energy needed by the motor, while the control unit processes drive commands and uses the configured feedback information to regulate motor operation.

The single-axis arrangement is useful in modular machine-tool installations where individual control units are assigned to specific feed axes or spindle drives. The numerical control generates the movement commands, and the drive system regulates motor response according to the configured operating parameters and feedback signals.

A defining characteristic of this model is its direct measuring system interface. The configured system can obtain measurement information directly from the machine axis rather than relying exclusively on motor-side feedback. This is relevant where the mechanical transmission and positioning requirements call for direct measurement of actual axis movement.

The voltage-signal specification is equally important when selecting the control unit. The connected measuring equipment must match the intended signal interface. Although the 6SN1118-0DG23-0AA1 belongs to the same product family as current-signal variants, the two configurations should not be treated as interchangeable without matching the measurement hardware and control-system requirements.

For example, a CNC machining center may use a linear measuring system to monitor the position of a machine table. The numerical control commands the required movement, the power module drives the motor, and the control unit regulates the axis using the configured feedback signals. The measuring system supplies information about actual table movement for the drive-control arrangement.

The 6SN1118-0DG23-0AA1 is therefore a specialized component for compatible SIMODRIVE 611-D installations. Its performance closed-loop control, single-axis configuration, direct measuring system, and voltage-signal interface define its role within the complete drive architecture.

Technical Specifications

Product Features

• Single-axis control: Provides drive-control functions for one axis in a compatible SIMODRIVE 611-D system.
• Performance closed-loop regulation: Supports regulated motor operation using the configured drive-control and feedback arrangement.
• Direct measuring system interface: Supports direct measurement of machine-axis movement within the specified configuration.
• Voltage-signal compatibility: Matches the voltage-signal measuring-system arrangement associated with this model.
• Digital-drive integration: Fits into the SIMODRIVE 611-D architecture for compatible feed and spindle drives.
• Feed-drive applications: Supports controlled movement of compatible CNC machine axes.
• Main-spindle applications: Serves compatible spindle-drive configurations within the specified drive architecture.
• Power-module coordination: Works with the associated power section that supplies motor power.
• Numerical-control integration: Operates as part of a coordinated CNC motion-control system.
• Axis-specific configuration: Requires drive parameters suited to the connected motor, measuring system, and mechanical transmission.

Working Principle

The 6SN1118-0DG23-0AA1 regulates one axis within a SIMODRIVE 611-D digital drive system. It works with the numerical control, power module, motor, and configured direct measuring system to control the axis according to the required motion commands.

Numerical Control → SIMODRIVE 611-D Control Unit → Power Module → Motor → Mechanical Axis

The numerical control generates the movement command based on the machine program. The control unit processes the associated drive-control requirements, while the power module supplies the electrical energy needed by the motor.

The motor converts electrical energy into mechanical rotation. In a feed-drive application, this rotation may pass through a ball screw or another transmission mechanism to move a table, carriage, or slide. The direct measuring system monitors movement at the machine axis and supplies the configured voltage feedback signals.

This arrangement allows the drive-control system to use measurement information from the actual axis. The resulting control behavior depends on the measuring system, signal characteristics, motor configuration, mechanical transmission, and drive parameters.

The voltage-signal interface must match the connected measuring equipment. A measurement device intended for a different signal arrangement may not operate correctly with this control-unit variant. During commissioning, engineers should verify the feedback connections, axis assignment, drive parameters, and response to controlled movement commands.

If the reported axis position differs from actual machine movement, the investigation should include the measuring system, signal wiring, mechanical transmission, and numerical-control configuration rather than focusing on the control unit alone.

Role in a SIMODRIVE 611-D Control Architecture

The 6SN1118-0DG23-0AA1 occupies the drive-control position between the numerical control system and the power section. It regulates the assigned axis using the specified direct measuring system and voltage-signal configuration. The power module supplies motor power, while the mechanical transmission converts motor rotation into the required machine movement.

CNC Numerical Control → SIMODRIVE 611-D Control Unit → Power Module → Drive Motor → Machine Axis

Industrial Applications

Installation and Maintenance

1. Confirm the control-unit reference: Verify that 6SN1118-0DG23-0AA1 matches the required SIMODRIVE 611-D application and single-axis configuration.
2. Review the drive architecture: Identify the associated power module, motor, numerical control, and direct measuring system before replacement.
3. Isolate the drive system: Disconnect the relevant electrical supplies and follow the machine’s lockout and stored-energy discharge procedures.
4. Record the original configuration: Document the axis assignment, parameter settings, module position, and measuring-system connections before removal.
5. Inspect the plug-in interface: Check the mounting and electrical interfaces for damage, contamination, or signs of overheating.
6. Verify the measuring-system signals: Confirm that the connected measurement equipment matches the voltage-signal interface specified for the control unit.
7. Install the control unit: Fit the module into the designated SIMODRIVE 611-D position according to the system installation procedure.
8. Check associated connections: Inspect the control, feedback, and power-module interfaces before restoring electrical power.
9. Restore drive parameters: Apply the appropriate settings for the installed motor, measuring system, and machine axis.
10. Verify axis assignment: Confirm that the numerical-control configuration, control unit, and measuring system correspond to the same axis.
11. Test controlled movement: Perform the approved commissioning checks and verify that axis feedback and motor response agree with the configured system.
12. Record maintenance results: Document the installed module reference, parameter changes, diagnostic findings, and commissioning results for future maintenance.

Related Components

Recommended Related Models

Key Advantages

• Provides single-axis performance closed-loop control within a compatible SIMODRIVE 611-D system.
• Supports direct machine-axis measurement through the specified voltage-signal interface.
• Integrates with the corresponding power module and numerical control.
• Supports compatible feed-drive and main-spindle-drive applications.
• Fits CNC drive architectures requiring a dedicated single-axis control unit with direct feedback.

Technical FAQs

What distinguishes the 6SN1118-0DG23-0AA1 from the DG22 variant?

The DG23 configuration uses a direct measuring system with voltage signals, whereas the DG22 variant uses current signals. The measuring equipment and signal interface must match the selected control unit.

Why use direct machine-axis measurement in a CNC drive?

Direct measurement provides information about movement at the machine axis itself rather than relying exclusively on motor-side feedback. This is useful when the machine’s positioning requirements call for direct measurement of actual axis movement.

Does this control unit supply the motor’s main electrical power?

No. The associated SIMODRIVE 611-D power module supplies the motor’s main electrical power. The control unit manages drive regulation using the configured commands and feedback signals.

What should be investigated if the reported axis position is incorrect?

Check the direct measuring system, voltage-signal connections, axis assignment, drive parameters, numerical-control configuration, and mechanical transmission. A measurement or wiring fault can affect position feedback even when the control unit is functioning normally.