Siemens 6SN1118-0DM31-0AA0 SIMODRIVE 611 Regulation Card

The Siemens 6SN1118-0DM31-0AA0 is a digital regulation (control) board for the SIMODRIVE 611 series AC servo drives. It is designed to control one feed axis (speed and position) in machine tools, handling the signal processing between the CNC (e.g., SINUMERIK 810D/840D) and the power module (6SN1123). The card plugs into the main drive chassis.

Features and Control Modes

The regulation card supports speed control (with tachogenerator or resolver feedback) and position control (with encoder feedback). It includes a 32-bit microcontroller (Texas Instruments TMS320C32) running at 40 MHz. Control loop cycle times: speed loop 62.5 µs, position loop 250 µs. Integrated functions: current limitation, electronic gear ratio, feedforward, and friction compensation. The card also handles monitoring functions (overcurrent, overtemperature, encoder loss).

Interfaces and Connections

Motor feedback: two resolver inputs (1.8 kHz or 4.8 kHz) or one encoder input (TTL incremental, up to 500 kHz). Encoder simulation output (A/B, TTL) for connection to CNC. Analog inputs: one 16-bit for torque/speed setpoint (±10 V). Digital I/O: 4 inputs (24 V DC) for enable, pulse inhibit, and reference switch; 2 outputs (relay, 24 V/0.5 A) for brake control and ready signal. Communication to the power module is via a 20-pin ribbon cable (internal).

Configuration and Parameterization

Parameters are stored in an onboard EEPROM and configured using the SIMODRIVE 611 universal software (or via the Siemens SimoCom U tool). The card supports motor data identification (auto-tuning) to optimize control loops. A 7-segment display on the card shows operating states (e.g., “0” ready, “1” enabled, “E” error). The card also has a diagnostic LED for phase current monitoring.

Mechanical and Environmental

Dimensions: 140 mm x 55 mm x 180 mm. Weight: 0.3 kg. Plug-in module fits into slots A or B of the SIMODRIVE 611 frame (sizes A to D). Operating temperature: 0°C to 50°C. Storage: -40°C to 70°C. Humidity: 25% to 95% non-condensing. The board is conformal coated for industrial environments. It is powered by the backplane of the drive (15 V and 5 V from the power supply module).

Typical Applications and Compatibility

The 6SN1118-0DM31-0AA0 is used on milling machines, lathes, and machining centers with SINUMERIK 810D/840D CNC. It controls spindle orientation (C-axis) or feed drives (e.g., X, Y, Z). The card can be replaced with 6SN1118-0DM31-0AA1 (newer revision) without changing parameters. In case of failure, the board must be exchanged and the parameter backup restored from the CNC or a stored file.