Select motion control cards based on axis count, precision, and interface (Source: Douyin MT Series). Golden Rule: Determine the axis count first, then the pulse specifications (Source: Douyin). Core Factors: Interpolation and encoder feedback (Source: Adtech)—Note: Interface mismatch is the most common issue (Source: Douyin MT Series).
I.
Axis Count Selection
4-axis: Small-to-medium point-to-point applications (Source: Alibaba); 6-axis: Visual laser inspection (Source: Douyin PCI); 12-axis: Multi-axis servo + stepper (Source: Douyin JTM); 20-axis: EtherCAT bus expansion (Source: Zmotion); Reserve Capacity: Single system supports multiple cards (Source: Douyin PCI)—Axis range: 4–20 axes (determined by the process).
II.
Pulse Frequency
200 Kpps: Entry-level single-axis (Source: Douyin Hengkai); 2 MHz: CNC standard (Source: Alibaba); 4 Mpps: High-speed PCI card (Source: Douyin PCI); 8 MHz: High-end multi-axis (Source: Douyin JTM); 32-bit: 32-bit pulse counter (Source: Douyin JTM)—Frequency range: 200 KHz–8 MHz (frequency determined by speed requirements).
III. Interpolation Capabilities
Linear: 2-4 axis linear interpolation (Source: STEP); Arc: Arbitrary arc interpolation (Source: Zmotion); Spatial: Spatial arc and helical interpolation (Source: Zmotion); Cam: Electronic cam and electronic gearing (Source: Zmotion); Synchronization: Synchronous following of virtual axes (Source: Zmotion)—Interpolation: Linear + Arc + Cam (Trajectory core).
IV.
Feedback Precision
24-bit: Encoder feedback resolution (Source: NI); 32-bit: Position counter range (Source: STEP); Closed-loop: Real-time deviation correction (Source: NI); Quadrature: A/B/Z quadrature encoder (Source: NI); Position Latch: Hardware buffering for position latching (Source: STEP)—Feedback: 24/32-bit (Precision benchmark).
V.
Interface Bus
PCI: Mainstream for industrial PCs (Source: Douyin PCI); USB: Portable debugging (Source: Douyin Hengkai); EtherCAT: Bus-based motion control (Source: Zmotion); Pulse: Pulse/Dir + CW/CCW (Source: Douyin PCI); Hybrid: Bus + Pulse hybrid (Source: Douyin MT)—Interface: PCI/EtherCAT (Select based on architecture).
VI.
Software Ecosystem
Languages: C/C++/C#/LabVIEW (Source: Douyin); ZBasic: Multi-file, multi-task programming (Source: Zmotion); Function Libraries: Libraries for secondary development (Source: Douyin); Handwheel: Handwheel control and homing methods (Source: Douyin JTM); IO: Opto-isolated IO for limits and home positions (Source: Douyin)—Software: Languages + Function Libraries (Prerequisites for development).
7. Procurement Recommendations
1. Calculate the number of axes (including reserved ones); 2. Determine the frequency (speed requirements); 3. Verify interpolation capabilities (trajectory types); 4. Check feedback mechanisms (encoder positioning);
5. Assess the ecosystem (language support)—Card selection: Axis count + Frequency + Interface (three-wire closed-loop).
