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Siemens 1FL6042-2AF21-1AB1 Servo Motor Siemens 1FL6042-2AF21-1AB1 Servo Motor
The 1FL6042 series is a core product line in Siemens’ SIMOTICS S‑1FL6 family, designed specifically for the SINAMICS V90 Servo Drive System. It is divided into Low Inertia (LI) and High Inertia (HI) versions, covering power ratings of 0.4 kW and 0.75 kW, and supporting 230 V / 400 V power supply.
- Model Naming Convention
| Code Segment | Description | Values for 1FL6042 Series |
| 1FL6 | Siemens SIMOTICS S series servo motor identifier | Fixed |
| 42 | Product code representing specific power and frame size | Fixed |
| 1AF61 / 2AF21 | Design code | Main distinction |
| – 1AF61: HI, 400 V 3‑phase | ||
| – 2AF21: LI, 230 V 1/3‑phase | ||
| 1-2 | Encoder & connector type | Connector orientation |
| – 1: Straight connector | ||
| – 2: Right‑angle connector (HI only) | ||
| A / G / L / M | Encoder type | Feedback selection |
| – A/G/H: Incremental (2500 incr./rev) | ||
| – L: Absolute (20‑bit single‑turn, 12‑bit multi‑turn) | ||
| – M: Incremental (2500 incr./rev), plain shaft | ||
| A / B | Brake configuration | Brake option |
| – A: No brake | ||
| – B: With brake |
- Complete Model List & Key Parameter Comparison
2.1 Low Inertia Series (LI, 2AF21, 0.75 kW, 230 V)
Optimized low‑inertia rotor design for high‑dynamic performance.
Frame size 40 mm, rated torque 2.39 Nm, peak torque 7.20 Nm, rated speed 3000 rpm.
| Model | Encoder Type | Shaft Type | Brake | Key Features |
| 1FL6042‑2AF21‑1AA1 | Incremental (2500) | Keyed | No | Basic version, straight connector |
| 1FL6042‑2AF21‑1AB1 | Incremental (2500) | Keyed | Yes | With brake, for vertical loads |
| 1FL6042‑2AF21‑1AG1 | Incremental (2500) | Plain | No | Plain shaft for special couplings |
| 1FL6042‑2AF21‑1AH1 | Incremental (2500) | Plain | Yes | Plain shaft + brake |
| 1FL6042‑2AF21‑1LA1 | Absolute (20‑bit) | Keyed | No | Absolute encoder, no homing required |
| 1FL6042‑2AF21‑1LB1 | Absolute (20‑bit) | Keyed | Yes | Absolute encoder + brake |
| 1FL6042‑2AF21‑1MA1 | Incremental (2500) | Plain | No | Plain shaft, straight connector |
| 1FL6042‑2AF21‑1MB1 | Incremental (2500) | Plain | Yes | Plain shaft + brake, straight connector |
2.2 High Inertia Series (HI, 1AF61, 0.4 kW, 400 V)
High‑inertia rotor for stable operation and better inertia matching.
Frame size 45 mm, rated torque 1.27 Nm, peak torque 1.9 Nm, rated speed 3000 rpm.
| Model | Encoder Type | Connector | Brake | Key Features |
| 1FL6042‑1AF61‑0AA1 | Incremental (2500) | Straight | No | Basic, 400 V 3‑phase |
| 1FL6042‑1AF61‑0AB1 | Incremental (2500) | Straight | Yes | With brake |
| 1FL6042‑1AF61‑0AG1 | Incremental (2500) | Straight | No | Plain shaft |
| 1FL6042‑1AF61‑0AH1 | Incremental (2500) | Straight | Yes | Plain shaft + brake |
| 1FL6042‑1AF61‑0LA1 | Absolute (20‑bit) | Straight | No | Absolute encoder |
| 1FL6042‑1AF61‑0LB1 | Absolute (20‑bit) | Straight | Yes | Absolute encoder + brake |
| 1FL6042‑1AF61‑2AA1 | Incremental (2500) | Right‑angle | No | Right‑angle connector, space‑saving |
| 1FL6042‑1AF61‑2AB1 | Incremental (2500) | Right‑angle | Yes | Right‑angle + brake |
| 1FL6042‑1AF61‑2AG1 | Incremental (2500) | Right‑angle | No | Plain shaft + right‑angle |
| 1FL6042‑1AF61‑2AH1 | Incremental (2500) | Right‑angle | Yes | Plain shaft + right‑angle + brake |
| 1FL6042‑1AF61‑2LA1 | Absolute (20‑bit) | Right‑angle | No | Absolute encoder + right‑angle |
| 1FL6042‑1AF61‑2LB1 | Absolute (20‑bit) | Right‑angle | Yes | Absolute encoder + right‑angle + brake |
- Key Differences & Selection Guide
3.1 LI vs HI Core Comparison
| Item | Low Inertia (2AF21) | High Inertia (1AF61) | Selection Tip |
| Power | 0.75 kW | 0.4 kW | Match load power |
| Voltage | 230 V (1/3‑phase) | 400 V (3‑phase) | Match site power |
| Rated Torque | 2.39 Nm | 1.27 Nm | Higher torque density: LI |
| Peak Torque | 7.20 Nm | 1.9 Nm | Better dynamics: LI |
| Rotor Inertia | Low (0.897 kg·cm²) | High | HI for high‑inertia loads; LI for fast start/stop |
| Frame Size | 40 mm | 45 mm | HI is slightly larger |
3.2 Encoder Selection
| Encoder Type | Advantages | Typical Applications |
| Incremental | Lower cost, fast response | General positioning, no position retention after power loss |
| Absolute | Position retained after power loss, no homing | High‑precision positioning, quick recovery after safety stop |
3.3 Brake Selection
| Configuration | Typical Applications |
| With Brake | Vertical axes, drop prevention, emergency holding |
| No Brake | Horizontal axes, cost‑effective, high‑speed applications |
- Compatibility & Applications
All 1FL6042 series motors are fully compatible with SINAMICS V90 servo drives, support PROFINET / EtherCAT, and have IP65 protection.
Low Inertia (2AF21): Electronics manufacturing, packaging machinery, labeling machines, high‑speed conveyors
High Inertia (1AF61): Printing machinery, textile equipment, small machine tools, material handling systems
