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The Bachmann ACR222/2 is a high-performance, dual-axis motion control module designed exclusively for Bachmann’s M1 automation system, optimized for precise synchronization and control of two independent or coordinated motion axes. Unlike basic encoder input modules (e.g., Bachmann ISI222), the ACR222/2 integrates full motion control functionality—including trajectory planning, closed-loop feedback, and output drive signals—making it a "complete motion solution" for industrial applications requiring sub-millimeter accuracy. It excels in scenarios like CNC machining, robotic arm coordination, packaging line web alignment, and automated material handling, where two axes must operate in tandem (e.g., X-Y table positioning) or independently (e.g., dual-conveyor speed control) with minimal latency.
- 2-Axis Linear Interpolation: Enables smooth, synchronized motion of two axes (e.g., X-Y table) along a straight path—critical for applications like CNC milling or laser cutting, where deviations from the target path would cause part defects. The module calculates intermediate position setpoints in real time (update rate: 1kHz) to ensure constant velocity and minimal tracking error (<0.1% of path length).
- Independent Axis Operation: Each axis can run separate motion profiles (e.g., Axis 1 for "jogging" a conveyor, Axis 2 for "point-to-point" positioning of a gripper) without cross-interference. This flexibility is ideal for mixed-motion systems, such as a packaging machine where one axis controls film feed and the other adjusts sealing head position.
- Multi-Type Feedback Support: Compatible with incremental/absolute encoders and analog position sensors, allowing integration with diverse motion systems (e.g., a servo motor with an incremental encoder, a linear stage with an SSI absolute encoder). The module automatically processes feedback signals (including 4x interpolation for incremental encoders) to calculate actual position, velocity, and acceleration.
- Closed-Loop Error Correction: Compares target position/velocity with actual feedback data and adjusts the output drive signal (analog/PWM) in real time to minimize error. For example, if a servo motor lags behind the target position due to load changes, the module increases the torque command to correct the deviation—ensuring position accuracy even under variable loads.
- Configurable Trajectory Profiles: Users define motion parameters (target position, velocity, acceleration/deceleration rates, jerk limit) via Bachmann M1 Configurator or IEC 61131-3 function blocks (e.g.,
MC_MoveAbsolute
, MC_Jog
). Jerk limits (0–10,000 mm/s³) prevent mechanical shock, extending the life of motors and mechanical components.
- Smart Homing Sequences: Supports 6 pre-configurable homing modes (e.g., "home to limit switch + index pulse", "home to absolute zero") to suit different machine designs. Homing is automated and includes error checking (e.g., "limit switch not triggered") to ensure safe, repeatable reference positioning.
- Motion Safety Interlocks: Integrates with M1 system safety logic to trigger emergency stops (E-Stop) or controlled deceleration if unsafe conditions are detected (e.g., axis overtravel, feedback loss). The module immediately sets output drives to a "safe state" (0V torque command) to prevent machine damage or operator injury.
- Comprehensive Diagnostics: Transmits real-time status data (e.g., "Axis 1: Position Error = 0.5mm", "Axis 2: Feedback Loss") to the M1 CPU. LED indicators on the module provide at-a-glance alerts for critical faults (red = axis fault, yellow = warning, green = normal operation). Diagnostic logs include timestamped events (e.g., "2024-05-20 14:30: Axis 1 Overcurrent") for root-cause analysis.
- EMI Immunity & Isolation: 2kV AC isolation protects the module and connected drives/sensors from ground loops and voltage spikes (common in machine tool environments). Differential signaling for encoder inputs resists electromagnetic interference from nearby motors or inverters, ensuring stable feedback even in noisy conditions.
- Wide Temperature Tolerance: Operates reliably at -25°C ~ +60°C, making it suitable for unheated factory floors or control cabinets near heat-generating equipment (e.g., CNC spindle motors).
- CNC X-Y Table Control: Manages two axes of a milling machine—Axis 1 (X-axis) and Axis 2 (Y-axis) run linear interpolation to cut straight or angled paths. SSI absolute encoders on each axis provide precise feedback, and closed-loop control corrects for tool wear or load variations.
- Robotic Arm Coordination: Controls the shoulder (Axis 1) and elbow (Axis 2) joints of a 2-axis robotic arm. The module coordinates motion to ensure smooth, collision-free movement between waypoints, with jerk limits to prevent mechanical stress.
- Packaging Line Web Alignment: Adjusts two axes of a web guide system—Axis 1 (lateral position) corrects side-to-side drift of packaging film, while Axis 2 (tension) maintains consistent film tightness. Incremental encoders monitor film position, and the module adjusts servo drives in real time to keep the web aligned.
- Automated Material Handling: Controls a dual-axis gantry system—Axis 1 (horizontal travel) moves the gantry along a rail, and Axis 2 (vertical lift) raises/lowers a gripper. Point-to-point motion profiles ensure fast, accurate positioning of parts between conveyor lines.
-
Feedback Wiring Guidelines:
- For encoders: Use twisted-pair shielded cables (0.14–0.5mm²) to minimize noise. For incremental encoders, limit cable length to ≤50m (TTL) or ≤100m (HTL); for SSI absolute encoders, use shielded twisted-pair cables with 4 wires (DATA+/DATA-, CLK+/CLK-) and limit length to ≤100m.
- Ground the cable shield at the module’s terminal block end only—double-ended grounding creates ground loops that corrupt feedback signals.
-
Drive Output Configuration:
- Match the output drive signal type to the connected drive (analog for servos, PWM for steppers). For analog torque commands (±10V), calibrate the module to the drive’s torque range (e.g., 0–10V = 0–100% torque) via M1 Configurator to avoid overloading the motor.
- For PWM outputs, set the frequency (1kHz–10kHz) based on the stepper drive’s specifications—higher frequencies (10kHz) reduce motor noise but may increase drive heating.
-
Motion Profile Tuning:
- Start with conservative acceleration/deceleration rates (e.g., 100 mm/s²) and increase gradually to avoid mechanical shock. Use the M1 Configurator’s "motion monitor" tool to view position error and adjust parameters (e.g., increase acceleration if error is low, reduce if error exceeds limits).
- For coordinated motion (linear interpolation), ensure both axes have matching dynamic capabilities (e.g., similar maximum velocity/acceleration) to prevent path distortion.
-
Safety Integration:
- Connect external safety devices (limit switches, E-Stop buttons) to the M1 system’s safety inputs and link them to the ACR222/2 via M1 safety logic. Test E-Stop functionality before commissioning to confirm the module immediately stops motion and sets drives to safe state.
- Enable "overtravel protection" in M1 Configurator to trigger a controlled stop if an axis exceeds its defined travel range (e.g., X-axis: 0–1000mm).
-
Maintenance & Troubleshooting:
- Inspect encoder connectors quarterly for corrosion or loose pins—clean with isopropyl alcohol if debris accumulates. Tighten terminal screws to 0.5–0.8N·m to prevent vibration-induced loosening.
- If an axis shows excessive position error: Check for mechanical binding (e.g., worn bearings), verify feedback wiring, and re-calibrate the closed-loop gains (proportional, integral, derivative) via M1 Configurator.
- If feedback loss is detected: Confirm the encoder is powered (5V DC for TTL, 24V DC for HTL) and check for cable damage. Replace the encoder if it fails to generate a signal


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