Siemens SIMODRIVE Modules: 6SN1118-0DB12-0AA0

Technical Dossier

Product Details And Specifications

Siemens SIMODRIVE Series Technical Notes

The Siemens SIMODRIVE platform is one of the most widely deployed digital drive systems in global heavy industry. Installed across petrochemical complexes, nuclear power facilities, offshore refineries, and large-scale manufacturing plants, SIMODRIVE systems have served as the motion control backbone for CNC machine tools, coordinated axis drives, and high-precision servo applications since the early 1990s. The architecture is built around a modular backplane bus, allowing integration of power modules, control boards, and I/O expansion units within a single rack. Its compatibility with SINUMERIK CNC controllers and SIMATIC S7 PLCs made it the default drive solution for Siemens-integrated automation lines worldwide. As of 2026, the SIMODRIVE series has entered its end-of-life phase, with Siemens officially transitioning customers to the SINAMICS S120 platform. However, the installed base remains enormous, and demand for spare parts, refurbished modules, and lifecycle extension support continues at high volume.

The Evolution of SIMODRIVE Architecture

The SIMODRIVE system was introduced by Siemens in the early 1990s as a successor to analog drive platforms. The initial SIMODRIVE 611A (analog) series provided basic velocity control for AC servo and spindle motors. This was followed by the SIMODRIVE 611D (digital) series, which introduced closed-loop digital current and speed control via a dedicated DSP-based control board. The 611D architecture used a common DC bus topology, allowing multiple axes to share a single infeed/regenerative module, significantly reducing cabinet footprint and energy consumption in multi-axis CNC installations.

The SIMODRIVE 611U (universal) variant extended compatibility to both synchronous and asynchronous motors without encoder feedback, broadening the platform's applicability to general-purpose drives. The POSMO (positioning motor) sub-series integrated drive electronics directly into the motor housing for distributed axis control. Throughout the 2000s, Siemens released successive firmware generations improving dynamic response, safety integration (STO, SS1, SOS per IEC 62061), and PROFIBUS-DP communication throughput. By 2015, Siemens announced the formal migration path to SINAMICS S120, though SIMODRIVE hardware continued in production until approximately 2020. Compatibility issues between SIMODRIVE 611D and newer SINUMERIK 840D sl controllers require specific interface modules and firmware alignment — a critical consideration for retrofit projects.

SIMODRIVE Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly stocked modules within the SIMODRIVE ecosystem. Each entry reflects a distinct functional role within the drive system architecture.

6SN1118-0DB12-0AA0: Control board for SIMODRIVE 611D, 2-axis digital servo regulation module.
6SN1118-0AA11-0AA0: SIMODRIVE 611D single-axis control module, standard encoder interface.
6SN1118-0AA11-0AA1: Single-axis control module, extended encoder input, revised firmware revision.
6SN1118-0DH23-0AA0: 2-axis control module with PROFIBUS-DP interface for networked axis coordination.
6SN1118-0DH23-0AA1: 2-axis PROFIBUS control module, updated DSP firmware, improved cycle time.
6SN1145-1BA01-0BA0: Infeed/regenerative module, 16 kW, for SIMODRIVE 611D common DC bus systems.
6SN1145-1BA02-0BA0: Infeed/regenerative module, 36 kW, high-power multi-axis installations.
6SN1123-1AA00-0CA0: Power module, 9 A, single-axis, for compact servo drive configurations.
6SN1123-1AA00-0DA0: Power module, 18 A, single-axis, standard CNC axis drive.
6SN1123-1AA00-0EA0: Power module, 28 A, single-axis, high-torque servo axis.
6SN1124-1AA00-0CA0: Power module, 9/18 A, dual-axis, space-optimized rack configuration.
6SN1124-1AA00-0DA0: Power module, 18/36 A, dual-axis, standard multi-axis CNC drive.
6SN1111-0AA01-1CA0: Monitoring module for SIMODRIVE 611D, DC bus voltage supervision and fault relay.
6SN1162-0GA00-0AA0: Shield connection terminal for SIMODRIVE 611 series, EMC compliance component.
6SN1114-0AA01-0AA0: Pulse resistor module, braking energy dissipation for non-regenerative configurations.
6SN1113-1AA00-0DA0: Line filter module, 36 A, EMC Class C2 compliance for SIMODRIVE 611 infeed.
6SN1246-0BA00-0BA0: SIMODRIVE POSMO A positioning motor drive, integrated axis controller, 75 W.
6SN1246-0BA00-0CA0: SIMODRIVE POSMO A, 300 W, distributed drive for conveyor and handling axes.
6SN1197-0AB10-0BP0: Encoder cable set, pre-assembled, for SIMODRIVE 611D axis feedback wiring.

Sourcing Hard-to-Find & Obsolete SIMODRIVE Parts

The SIMODRIVE series reached official end-of-production status, with Siemens discontinuing new manufacture of most 611D control boards and power modules. For facilities operating legacy SINUMERIK 840D, 810D, or 840C systems, replacement sourcing has become a critical maintenance challenge. DriveKNMS maintains a dedicated inventory of refurbished, tested, and exchange-ready SIMODRIVE modules to support lifecycle extension programs for these installations.

Quality Control for the SIMODRIVE Range

SIMODRIVE modules present specific test challenges due to their multi-layer backplane bus architecture, high-frequency PWM switching circuits, and DSP-based control logic. DriveKNMS applies a structured test protocol to all SIMODRIVE units prior to dispatch.