When a 6-axis industrial robot swings a 200-pound payload at full speed, the kinetic energy involved can be fatal. This is not a theoretical concern. Industrial robot incidents have resulted in severe injuries and deaths in manufacturing facilities worldwide. The safety standards that govern how robots are designed, integrated, and operated exist because real people have been hurt.
ISO 10218 is the primary international standard for industrial robot safety. It defines the requirements for robot manufacturers (Part 1) and robot integrators (Part 2). For automation professionals â robot programmers, system integrators, safety engineers, and maintenance technicians â understanding this standard is both a professional requirement and a legal responsibility.
## ISO 10218: The Two-Part Standard
### Part 1: Robots (ISO 10218-1:2011)
ISO 10218-1 applies to robot manufacturers. It defines the safety requirements for the robot itself: emergency stop functionality, speed and force limiting capabilities, protective stop functions, and the performance requirements for the robot's safety-related control system.
Key requirements:
- Emergency stop (Category 0 or Category 1 per IEC 60204-1) must be accessible on the teach pendant and at external locations
- Reduced speed mode limited to 250mm/s when personnel are in the safeguarded space
- Axis limiting (software and hardware) to restrict robot motion to defined envelopes
- Safety-rated monitored stop â robot holds position with safety-rated monitoring active
- Hand guiding capability for collaborative applications (with safety-rated force limiting)
Robot manufacturers like FANUC, ABB, KUKA, and Yaskawa design their robots to comply with ISO 10218-1. The safety functions are built into the robot controller hardware and firmware.
### Part 2: Robot Systems and Integration (ISO 10218-2:2011)
ISO 10218-2 applies to system integrators â the companies and engineers who design robotic work cells and install them in manufacturing facilities. This is where most automation professionals interact with the standard.
Key requirements:
- Risk assessment must be performed for every robot installation (ISO 12100 methodology)
- Safeguarding must prevent personnel from entering the robot's operating space during automatic operation
- Perimeter guarding (safety fencing with interlocked gates) is the most common safeguarding method
- Presence-sensing devices (safety light curtains, safety laser scanners, safety mats) provide alternative safeguarding
- Safety-related control systems must achieve Performance Level d (PLd) minimum per ISO 13849-1
- Layout design must account for robot reach, payload trajectories, workpiece ejection, and tool failure modes
## ISO/TS 15066: Collaborative Robot Safety
ISO/TS 15066 is the technical specification that supplements ISO 10218 for collaborative robot (cobot) applications where humans and robots share workspace. It defines four collaborative operation methods:
### 1. Safety-Rated Monitored Stop
The robot stops before a human enters the collaborative workspace. The robot does not move while a human is present. Motion resumes when the human exits. This is the simplest method but provides no simultaneous human-robot interaction.
### 2. Hand Guiding
An operator physically guides the robot using a hand-guiding device (usually on the end-effector). The robot only moves when the operator applies force. Speed and force are limited. This method is common for teach-and-repeat applications.
### 3. Speed and Separation Monitoring
Safety sensors (laser scanners, 3D cameras, radar) monitor the distance between the human and the robot. The robot adjusts speed based on separation distance: full speed when far away, reduced speed when closer, stops when too close. This allows productive robot operation while maintaining safety.
### 4. Power and Force Limiting
The robot is designed to limit contact forces to values below pain and injury thresholds defined in ISO/TS 15066 Annex A. This is the method most people associate with collaborative robots. The standard defines maximum permissible forces and pressures for 29 body regions.
Maximum quasi-static contact forces by body region (examples):
- Skull/forehead: 130N
- Face: 65N
- Neck (sides): 150N
- Chest: 140N
- Hand/fingers: 140N
- Lower leg: 130N
These force limits are the reason collaborative robots have payload limitations â a robot that can only exert 140N of force on a human chest cannot also manipulate heavy workpieces at high speed.
## Risk Assessment: The Foundation of Robot Safety
Every robot installation requires a documented risk assessment per ISO 12100. The assessment follows a structured process:
1. Define the limits of the robot system (space, time, intended use)
2. Identify hazards (mechanical, electrical, thermal, radiation, material/substance)
3. Estimate risk for each hazard (severity of harm x probability of occurrence x possibility of avoidance)
4. Evaluate risk against acceptable criteria
5. Reduce risk through the three-step method: (a) inherently safe design, (b) safeguarding and protective devices, (c) information for use (warnings, training)
The risk assessment must be performed by competent personnel and documented. It is a legal document. If a robot incident occurs and the risk assessment is missing, incomplete, or did not address the specific hazard, the integrator faces significant liability.
## ANSI/RIA 15.06: The North American Standard
In the United States and Canada, ANSI/RIA 15.06-2012 (R2017) is the national adoption of ISO 10218. It is technically equivalent to ISO 10218 with additional North American requirements:
- References NFPA 79 for electrical safety (in addition to IEC 60204-1)
- Requires compliance with OSHA 29 CFR 1910.212 (general machine guarding)
- Includes additional requirements for robot teaching pendant operation
- Specifies lockout/tagout procedures per OSHA 29 CFR 1910.147
Automation professionals working in North America must comply with both ANSI/RIA 15.06 and any state-specific requirements (Michigan and California have additional robot safety regulations).
## Career Impact: Robot Safety Certification
Robot safety expertise commands a significant premium in the market. Based on Automate America contract data:
- Robot programmer without safety expertise: $65-$95/hr
- Robot programmer with safety expertise: $85-$120/hr
- Certified robot safety specialist: $100-$135/hr
The Robotic Industries Association (now Association for Advancing Automation, A3) offers the Certified Robot Integrator program. TUV Rheinland offers functional safety certification (TUV FSEng) recognized globally. FANUC, ABB, and KUKA all offer robot safety training courses specific to their platforms.
As collaborative robots expand into new manufacturing applications, the demand for professionals who understand both the technical safety requirements and the regulatory framework will continue to grow. Companies cannot deploy robots without safety documentation, which means every robot installation needs someone who can perform risk assessments, design safeguarding systems, and validate safety performance levels.
The professionals who combine robot programming skills with safety engineering expertise are among the highest-paid automation specialists in the industry.
