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Start with the application and the complete robot system
Define what the workcell must do before selecting a robot or controller. The robot is only one part of the system: the controller, drives, power sources, sensors, programming, end effector, surrounding equipment, and interfaces all affect the design. OSHA describes a robot control system as including a power source, sensors, computer or microprocessor inputs, programming functions, and output commands to the manipulator and/or end effectors. Power may be electrical, pneumatic, or hydraulic, and stored energy can present hazards. OSHA Technical Manual, Section IV, Chapter 4
Translate the task into engineering requirements before comparing hardware. Record the workpiece and tooling, intended operations, work area, path and cycle needs, required accuracy and repeatability, environment, axes, sensing, I/O, network connections, and maintenance access. Include foreseeable misuse and the interfaces with other machines. These inputs establish the basis for robot selection and reveal requirements that a controller choice must satisfy.
Distinguish robot-level design from application integration
ISO 10218-1:2025, third edition, published in February 2025, covers industrial robots as incomplete machines, including inherently safe design, risk-reduction measures, and information for use. Robot applications and integration are addressed separately in ISO 10218-2:2025. The completed workcell can introduce hazards that are not present in the robot by itself—for example, from welding, laser cutting, or machining. ISO 10218-1:2025
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That distinction matters when assigning design and safety work: robot-level provisions do not, by themselves, establish that the integrated application is safe. Document an application-specific risk assessment and identify who is responsible for each risk-reduction measure. This article is an engineering planning guide, not a risk assessment or a determination of compliance; detailed requirements depend on the application, jurisdiction, and full current standards.
Check applicable standards and legal obligations for the location
OSHA lists consensus standards as guidance from the organizations that issue them and explicitly states they are not OSHA regulations. Its robotics standards page lists ISO 10218-1 and ISO 10218-2, and also refers to ANSI/RIA R15.06-2012 as a U.S. adoption of the 2011 ISO editions. Do not treat that older adoption statement as evidence that the 2025 ISO editions have been adopted in the United States. Confirm current adoption, applicable legal duties, and the standards that apply to the specific location and use case. OSHA Robotics — Standards
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Turn the task into robot and controller requirements
Reach, physical dimensions, and payload vary by robot model and application; there is no universal robot/controller specification or sizing value that fits every cell. Establish the actual operating envelope and loads, including the workpiece and end effector, then compare candidate robots against those requirements. Account for path and cycle demands as well as the surrounding equipment and access needed to operate and maintain the cell. OSHA likewise emphasizes that application requirements determine the specifications and that integration, operation, and maintenance can introduce hazards. OSHA Technical Manual, Section IV, Chapter 4
- Task and geometry: Define operations, workpiece positions, reach, physical clearances, path constraints, and required axes.
- Loads and tooling: Specify payload requirements using the actual workpiece and end-effector configuration; include the tooling and sensing needed for the task.
- Motion performance: State cycle, path, accuracy, and repeatability requirements in terms appropriate to the application.
- Control and interfaces: Identify machine synchronization needs, I/O, networks, sensors, programming handoffs, diagnostics, and integration interfaces.
- Environment and lifecycle: Consider operating conditions, maintenance access, service processes, available skills, and expected lifecycle support.
- Safety: Record application hazards, required safety-related functions, and how their implementation will be validated.
This list is a practical project checklist, not a checklist quoted from a standard. The sources do not provide a universal sizing formula or target values, so derive those from the defined application and verify them against the selected equipment’s current technical documentation.
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Choose a control architecture against integration needs
Two broad patterns are a dedicated robot controller connected to a machine PLC, and a unified architecture in which a machine controller and drives control the robot mechanics. Neither is inherently best for every project. Compare the actual supported robot, motion demands, integration interfaces, programming skills, validated safety implementation, and service arrangements.
| Design axis | Dedicated robot controller with machine PLC | Unified machine/robot control |
|---|---|---|
| Robot control | The robot vendor’s controller runs the robot program and kinematics. | In Rockwell Automation’s documented example, the Logix controller hosts robot kinematics and directs robot movement. |
| Integration | The robot and machine systems communicate through an integration interface; Rockwell describes a dedicated controller connected to a Logix PLC over EtherNet/IP. | A shared platform combines machine and robot control, using a Logix controller and Kinetix drives in the Rockwell example. |
| Potential strength | Dedicated robot-control capability and robot-specific tools; verify that the particular controller meets the application’s requirements. | Rockwell cites tighter synchronization and a common programming environment as benefits. These are vendor claims, not independent comparative results. |
| Questions to resolve | Interface latency, synchronization, diagnostics, programming handoff, and safety boundaries. | Supported robot mechanics, motion capacity, toolchain skills, validated safety functions, and lifecycle support. |
Rockwell Automation’s Unified Robot Control overview and Integrated Robots overview describe these patterns. Treat vendor-stated benefits as claims to check against project requirements, not as proof that one architecture will outperform another in a particular cell.
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Questions for a dedicated-controller design
- How will the robot controller and machine PLC exchange commands, status, and faults?
- What synchronization does the process require, and can the integration interface support it?
- How will teams divide programming, diagnostics, safety responsibilities, and maintenance?
Questions for a unified-control design
- Does the control platform support the specific robot mechanics and required motion capacity?
- Can the project team support the controller, drives, programming tools, and diagnostics throughout the system’s lifecycle?
- How will required safety-related functions be implemented and validated across the integrated system?
A dedicated controller is not automatically easier to integrate, and a shared controller does not automatically simplify safety or service. Use documented capabilities and project-specific validation to settle those questions.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Design motion control around real-time requirements
Industrial motion control depends on sensing, processing, and actuation. Texas Instruments defines real-time control as collecting and processing data and updating a system within a defined time window; missing that window can reduce stability, precision, and efficiency. The appropriate timing depends on the drive, control architecture, and performance requirements, so do not assume a universal cycle time. Texas Instruments, Industrial Robot Design Resources
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A typical servo-control arrangement uses cascaded loops: current or torque, speed, position, and higher-level motion control. The current/torque loop is the tightest, and each loop has its own real-time processing needs. This is a common architecture, not a fixed implementation rule for every robot or drive. Texas Instruments, An Engineer’s Guide to Industrial Robot Designs
During design, establish which component performs each control function, what sensing and processing it requires, and whether the architecture can meet the application’s motion demands. Evaluate timing as part of the complete control path rather than treating controller software in isolation.
Include safety, service, and lifecycle decisions in the design basis
Safety engineering must cover the integrated application and its energy sources, not just the robot program. Map hazards across integration, operation, and maintenance, then document the risk-reduction measures and the party accountable for each. Include safe isolation and stored energy in the system design. Confirm the full current text of the standards that apply; summaries and catalog listings do not substitute for the detailed requirements.
Maintainability also affects architecture. Before committing, determine how technicians will diagnose faults, access service information, obtain support, and work across the robot, controller, drives, machine PLC, and end effector. As one example of a dedicated-controller product model, ABB describes its IRC5 as offering motion control, safety, modularity, application interfaces, multi-robot control, PC tools, industrial I/O network support, and RAPID programming. Those are vendor-described capabilities, not a recommendation for every project; check technical limits, product lifecycle, and regional availability before selecting a specific model. ABB IRC5 Industrial Robot Controller
Quick Recap
Use a design-basis review before selecting equipment
- Define the task: Document intended operations, workpieces, tooling, operating envelope, and foreseeable misuse.
- Assess the application: Identify hazards in the complete cell and assign responsibility for each risk-reduction measure.
- Set robot requirements: Specify load, reach, geometry, path, cycle, accuracy, repeatability, environment, and axes from the application.
- Set control requirements: Record sensing, processing, drive, real-time, synchronization, I/O, network, and integration needs.
- Compare architectures: Evaluate dedicated and unified control against supported mechanics, motion performance, interfaces, programming, diagnostics, safety validation, and lifecycle support.
- Verify the selection: Check the current technical documents for the exact robot and controller models, and confirm applicable standards and legal obligations for the location.
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