Comprehensive connector solutions for safety data communication requirements of industrial robots

The role of connectors in industrial robot data connectivity applications

In industrial robot safety data connectivity and communication applications, connectors play an extremely critical role. They are not only bridges for electrical signals and power transmission but also one of the core components ensuring the stability, safety, and reliability of the entire automation system.
 
Firstly, connectors need to ensure the stability of safety data transmission. Industrial robots often need to receive data from sensors, controllers, and servo drives in real-time, such as position and speed feedback signals, as well as torque, temperature, and pressure sensing data. They also need to transmit safety signals like Emergency Stop and collision avoidance signals. This information is crucial for safety control. Therefore, connectors must provide high signal integrity, utilizing shielding structures and low contact resistance design to avoid electromagnetic interference and signal distortion. Additionally, they must meet high-speed data transmission capabilities, supporting industrial communication protocols like EtherCAT, PROFINET, and EtherNet/IP to fulfill real-time control requirements.
 
On the other hand, connectors must enhance mechanical structure and environmental protection. Since industrial robots often operate in high-vibration, oily, dusty, and high-temperature environments, connectors need to have high protection ratings to prevent the ingress of liquids and dust, and must adopt anti-vibration and anti-shock designs to ensure stable contact during long-term operation. Metal housings or reinforced plastic structures can be used to resist mechanical stress and electromagnetic interference. Such protective designs ensure that safety-related signals are not interrupted due to poor contact, avoiding dangerous malfunctions.
 
Connectors also need to support modularity and maintenance convenience. As robot designs evolve towards modular and expandable architectures, connectors need to provide quick-disconnect designs to reduce maintenance and replacement time, and support coding and latching mechanisms to prevent mis-mating. Integrated solutions combining power, signal, and data can also be adopted to simplify wiring. This is particularly important for module replacement and on-site maintenance of multi-axis robotic arms or collaborative robots.
 
In ensuring functional safety, connectors in safety communication applications also need to support redundant signal channel designs to maintain secure communication in case of a single line fault. Using metal shield grounding structures avoids interference from high-power lines on safety control signals, and enables compatibility with safety bus connection interfaces to ensure that safety-related data is not corrupted or delayed. These characteristics make connectors the physical assurance layer in the entire secure communication architecture.
 
In industrial robots, connectors are not just hardware accessories for electrical interfaces; they are the foundation for the reliable operation of the entire secure communication system. They ensure data transmission integrity, enhance system safety redundancy, and provide modular design and maintenance convenience. With the development of smart manufacturing and safety automation, high-performance, environmentally resistant connectors supporting secure communication protocols will continue to be key elements in industrial robot design.

Typical applications of connectors in industrial robot safety data connectivity and communication

In industrial robot safety data connectivity and communication applications, connectors can be used in various modules and safety functions, such as robot joint modules. Industrial robots typically consist of multiple rotational or linear joints, each requiring drive control, position feedback, and safety monitoring. In this module, connectors are mainly used for servo motor and drive signal transmission, encoder feedback and torque sensing, and safety monitoring circuits. They need key characteristics like anti-vibration structure, IP67 protection, 360° shielding, and support for high-frequency, high-speed transmission.
 
The "central nervous system" of industrial robots is located inside the control cabinet, which needs to integrate power, communication, sensing, and safety modules. Connectors can be applied to high-speed industrial Ethernet communication interfaces, safety bus transmission, and modular designs. They require key characteristics such as high-frequency shielding structure, low contact resistance, metal housing for EMI protection, and modular installation capability.
 
In the safety protection areas around the robot, connectors can be used to connect devices like light curtains, safety laser scanners, and safety door switches, as well as human-machine safety interfaces such as Emergency Stop buttons and two-hand control devices. These devices transmit signals through safety-certified communication protocols (such as SIL3, PLe levels), requiring connectors to have high insulation and high voltage resistance, anti-misinsertion and locking mechanisms, and support for multi-core redundant signal lines (dual-channel structure) to prevent safety risks caused by single-wire faults.
 
In the power and power distribution module, the robot drive system requires stable power transmission. Connectors here provide high-current, high-voltage connection capability (e.g., above 20A), waterproof and dustproof structure (IP67/IP69K), safety grounding, and metal housing design to prevent arcing or interference. Key characteristics required include high current carrying capacity, arc prevention, latching fixation, and resistance to mechanical stress.
 
In collaborative robots (Cobots), safety and flexibility are even more important. Connectors are often used in safety torque sensing and collision detection feedback, as well as real-time data link connections, such as TSN (Time-Sensitive Networking) interfaces, and end-effector changeover modules, utilizing quick-disconnect connectors for simultaneous connection of pneumatic pressure, electrical signals, and data.
 
In industrial robot safety communication applications, connectors are key components for electrical connectivity, reliable transmission of safety signals, and system modular design. They not only ensure data stability and safety redundancy during robot operation but also promote maintenance efficiency and design flexibility. With the proliferation of smart factories and collaborative robots, industrial connectors featuring high-speed communication, protection, and safety certifications will become the core technical support for enhancing overall system safety and reliability.

Molex's industrial-grade connectivity solutions adhere to the highest quality standards, boosting performance while protecting operators and ensuring the functional safety of robotic systems. The path to achieving these improvements often aligns with trends in connectivity solutions. Molex industrial-grade connectors feature optimized performance and reduced form factors, offering various circuit sizes, plating options and mounting choices, and mating heights to meet evolving demands. On the other hand, although industrial robots excel at performing assembly line tasks, human interaction is still required for programming, monitoring, and control. Molex's Squba Connectors can be used for internal data connections, ensuring the safe, stable, and efficient operation of industrial robots.
 
To minimize downtime, fully automated warehouses require high-speed connectivity, energy efficiency, and optimized signal processing to perform precise pick-and-pack tasks and remote maintenance. Advanced sensors and cameras demand connectors with superior signal integrity to seamlessly handle large data volumes. Molex enhances Automated Guided Vehicle (AGV) performance with a range of solutions for robust connectivity, optimized power consumption, and efficient data processing. As the processing hub of the AGV, the embedded controller handles real-time data to execute navigation commands and detect obstacles quickly and accurately. Squba connectors can be used for environmental control in AGVs, ensuring smooth operation in complex environments.
 
Motors and motion systems in cleaning robots require vibration-resistant connectors to maintain reliable power and signal transmission despite exposure to moisture and cleaning chemicals. Molex's Squba Connectors can serve as connectors for drive and motion control in commercial cleaning robots, ensuring stable signal transmission.
 
Molex is an industry leader in industrial connectivity and communication solutions. Its extensive product line of industrial robot connectors enables smart manufacturing and offers long-term reliability, ensures safe, space-saving designs, promotes production line flexibility, and provides "plug-and-play" options to reduce downtime.

Squba connectors deliver reliable power in space-constrained applications

Molex's Squba Connectors is sealed wire-to-wire connector system, available in 1.80mm and 3.60mm pitches, is UL approved and IP68 rated. It can carry up to 14.0A of current, providing reliable power in a wide range of space-constrained applications. The Squba Connector system offers significant design flexibility with color-coded, mechanically keyed options, a UL1230 compatible option for HVAC applications, and a panel-mount option.
 
In the evolving fields of commercial vehicles, consumer electronics, and industrial equipment, the trend towards miniaturization continues to accelerate. Shrinking device sizes increase the demand for compact connector solutions, which is crucial for managing the limited space available for electrical components. The Squba 3.60mm and 1.80mm pitch sealed connector systems meet this challenge head-on, offering a space-efficient design specifically tailored for applications where space is at a premium.
 
Typically, as electrical performance expands, the need for higher current increases. Squba Connectors address this pain point by using 16 to 24 AWG wire to carry up to 14.0A of current, providing a high-power solution without requiring the thicker wires that competitors might need. In many applications, exposure to moisture presents another challenge, posing a risk to the integrity of unsealed connectors. The Squba sealed connector system provides a robust solution with its UL-approved, IP68-rated seals, ensuring consistent and reliable performance even in damp environments.
 
The Squba Connector features a protected, low-profile positive latch that prevents wire damage and reduces the overall package size, protects seals from damage, and keeps terminals aligned. It provides reliable connection in high-vibration applications, with a primary lock enabling 30N of terminal retention force. The clean-body terminals with wraparound insulation crimp help avoid seal punctures.
 
Furthermore, the integrity of the seals is crucial, as damage during assembly, handling, transportation, or use could lead to product failure. Squba connectors are designed with protective covers to safeguard these seals, thereby enhancing connection reliability. Additionally, the connector's cover aids in the correct insertion of terminals, protecting the seals from potential damage during the assembly process. These thoughtful design features contribute to the durability and service life of the end products utilizing these connectors.

Conclusion

Connector solutions meeting industrial robots demands must balance high reliability, durability, and flexibility to ensure stable data and power transmission in harsh environments. Through modular design, quick installation, anti-interference capabilities, and high environmental resistance, modern connectors not only enhance system operational efficiency but also lay a solid foundation for future smart factories, edge computing, and Industrial IoT applications. As automation levels continue to rise, the industrial connectivity and communication connector solutions offered by Molex will become a key driving force behind industrial upgrading and the development of smart manufacturing.