Introduction
Modularity decides whether a humanoid is a sealed product or a platform that can evolve. A useful module boundary defines mechanical mounting power communication timing safety identity and calibration. Without those contracts a hand or joint can fit physically and still be impossible to use safely.
Key facts
- China started a national project for general humanoid modularity requirements in 2026.
- A separate Chinese project covers mechanical electrical and communication interfaces for integrated joints.
- ISO 9409 defines established mechanical interfaces for robot end effectors.
Mechanical compatibility is only the first layer
ISO 9409-1:2004 defines dimensions and orientation for a circular robot interface plate. Its public scope does not specify the load capacity of that coupling. Matching a bolt pattern therefore does not establish that a replacement hand is within the wrist load rating.
Power interfaces need clear operating envelopes
ISO/AWI 24112 is still a project. Its stated scope covers robot-side electrical connectors for end effectors up to 200 W. It excludes communication protocols, safety performance and cybersecurity. A connector matching that scope would still need separate checks for command semantics and fault handling.
Communication must describe timing and meaning
A raw bus connection does not create interoperability. Devices need agreed message definitions units update rates timestamps error states firmware identity and discovery. China has a separate humanoid body communication interface project which shows that communication is being standardized alongside mechanics.
Software needs capability discovery
Higher layers should be able to learn which joints sensors or end effectors are installed and what commands they support. A modular robot also needs version compatibility and calibration data that travel with the module. This reduces hard coded assumptions inside every skill.
Modularity changes maintenance economics
A field replaceable hand or joint can shorten downtime but only when the replacement process is documented and repeatable. Teams should measure swap time calibration time validation steps spare inventory and whether a replacement can be completed by site staff without factory support.
Limitations and missing information
- A module standard does not guarantee identical performance across vendors.
- Load and safety limits can change after a module swap.
- Calibration is part of the interface even when it is handled in software.
Sources and methodology
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