Component Configuration Tool

CANopen Motor Driver Evaluator

Configure and evaluate a CANopen motor driver for your robotics application. Check CiA 402 PDO mappings, control mode suitability, and compare trade-offs against EtherCAT alternatives.

Configure motor driver Review evidence

CANopen Motor Driver Evaluator

Configure your intended CANopen motor driver setup to determine the optimal CiA 402 mapping, detect potential synchronization bottlenecks, and review safety prerequisites.

Driver Application Parameters

Default screening state

Defaults model a BLDC traction driver using Profile Velocity. Change any field to update the result immediately.

Motor Technology

Application Target

CiA 402 Control Mode

Profile Velocity: Driver computes acceleration/deceleration. Low bus load.

Configuration Feedback

Expected Bus Load Impact

Low

PDO Strategy: Event-driven or async RxPDO for new targets, TxPDO for target reached/status.

Valid Architecture

This configuration effectively balances controller load and network bandwidth. Ensure the selected motor driver formally supports the CiA 402 profile and the specified mode.

Interpretation and next step

The selected profile-mode architecture keeps motion generation inside the driver and leaves the CANopen master with command/status supervision.

Action: Request the EDS file, verify the exact CiA 402 mode objects, and run a bench test with the target bitrate and node count.

Fallback: If the supplier cannot provide EDS evidence, treat the device as a proprietary CAN controller until PDO behavior is proven.

Proceed with verification

Evidence focus: EDS file, CiA 402 object list, PDO map, and one bench trace.

Request EDS, PDO map, supported modes, and firmware revision.
Bench-test with the target bitrate, cable length, and node count.
Map Quick Stop, fault reset, and STO behavior before vehicle integration.

Build the evidence pack Review risk controls

Assumption boundary

Profile mode with local loop closure; still verify firmware support and object mapping. This tool is a screening aid. It does not replace supplier conformance evidence, safety validation, or a measured CANopen bus-load and jitter trace from the target vehicle.

EDS and object dictionary

Confirms the driver is not just raw CAN with a marketing CANopen label.

Proof: EDS file plus firmware revision and supported CiA 402 modes.

PDO map and update policy

Determines whether target/status objects fit the intended control loop.

Proof: RxPDO/TxPDO map, transmission type, inhibit/event timer settings.

SYNC and bus-load measurement

Cyclic motion failures usually appear only under loaded network timing.

Proof: Analyzer trace at target bitrate, cable length, and node count.

Fault and safety reaction

Quick Stop and STO are different layers in the safety case.

Proof: Fault-reset timing, STO wiring diagram, IEC 61800-5-2 claim where applicable.

CANopen Motor Driver Selection Report

Integrating a CANopen motor driver requires understanding the CiA 402 state machine, PDO mapping limitations, and the true cost of cyclic control over a non-deterministic bus.

Local Intelligence

Modern CANopen drivers process encoder feedback and close PI/PID loops internally. By utilizing Profile modes, you offload compute tasks from the master controller.

Arbitration Limits

Because CAN uses message IDs for priority arbitration, a motor driver should not be assumed to deliver tightly synchronized multi-axis motion in the same way an EtherCAT system with distributed clocks can. Treat loaded-bus SYNC jitter as a measurement item, not a catalog promise.

STO Integration

Software commands over standard CANopen are not safety-rated. An industrial AGV safety case normally needs a hardware safety function, such as STO, validated against the vehicle risk assessment and applicable standards.

Key Integration Conclusions

Verify exact CiA 402 mode support: Just because a motor driver claims "CANopen support" does not mean it supports all modes. Always request the Electronic Data Sheet (EDS) file.
Decentralize motion for AGVs: For simple mobile robots, sending a Profile Velocity target (e.g., 500 RPM) and letting the driver maintain it usually creates a cleaner CANopen responsibility split than sending frequent position increments from the master.
Hardware STO is mandatory: Do not rely on CANopen Control Word `0x6040` (Quick Stop) for personnel safety. Use a risk-assessed hardware safety function and verify the drive, wiring, and controller behavior against the applicable ISO 3691-4 and IEC 61800-5-2 safety case.
Measure cyclic modes, do not assume them: CSV and CSP need target-system traces because cable length, node count, priority assignment, and heartbeat traffic can all change motion margin.
Treat EtherCAT as a motion requirement, not a prestige choice: Use it when synchronized multi-axis motion or very short cycles are the requirement; keep CANopen when profile modes and local loop closure meet the duty cycle.

Conclusion-to-Evidence Map

Use this table as the minimum evidence request before treating a CANopen motor driver as ready for AMR or AGV integration.

Decision claim	Evidence to request	What remains unknown	Acceptance check
Driver supports the required CiA 402 mode	EDS file, object dictionary, firmware revision	Optional objects and vendor extensions may differ by firmware	Import EDS into the target master and map the required PDOs
CANopen timing is sufficient	Analyzer trace at target bitrate, cable length, and node count	Emergency traffic and field noise may alter worst-case timing	Pass under acceleration, braking, heartbeat, and fault traffic
Safety response is documented	STO diagram, stop category, fault-reset sequence, risk file	Public pages rarely prove a specific supplier implementation	Validate the vehicle safety case against ISO 3691-4:2023 and drive safety claims
Fieldbus choice is justified	Axis cycle-time requirement and supplier timing data	Vendor benchmarks may not match the final wiring topology	Compare CANopen profile modes against EtherCAT only on the required motion class

CiA 402 Mode Selection Matrix

The mode choice should follow loop ownership and evidence needs, not only the motor type.

Mode	Best fit	Watch item	Evidence
Profile Velocity (PV)	Traction and conveyor axes with local velocity loop closure	Master still needs clear acceleration, stop, and fault policy	Mode object support, target velocity PDO, actual velocity PDO
Profile Position (PP)	Steering, lift, indexing, and point-to-point positioning	Confirm homing, following-error limits, and target reached bit	Homing objects, profile parameters, status word behavior
CSV	Velocity loops coordinated by a higher-level controller	SYNC cycle and bus-load margin must be measured	SYNC period limit, trace under full node count, error reaction
CSP	Only when timing and feedback behavior are proven for the axis	Highest mismatch risk for steppers and multi-axis traction	Position setpoint rate, jitter tolerance, missed-step handling

The CiA 402 State Machine Simplified

Before any motion can occur, the master must transition the driver through these CiA 402 states using Control Word (0x6040).

CANopen vs EtherCAT for Motor Drivers

Feature	CANopen Motor Driver	EtherCAT Motor Driver
Synchronization	Software SYNC on a priority-arbitrated CAN bus; verify jitter under target bus load	Distributed-clock architecture available on many EtherCAT drive systems; confirm vendor performance data
Multi-Axis Coordinated Motion	Requires measured cycle-time and jitter margin before scaling cyclic modes across axes	Often preferred for coordinated multi-axis motion when the controller, drives, and vendor data support it
Cost & Ecosystem	Highly cost-effective, ubiquitous in standard AGVs	Premium controllers needed, strict compliance requirements
Best Use Case	Decentralized profile-mode axes where the driver owns loop closure	Synchronous multi-axis systems where timing is a core requirement
Proof Needed	EDS, PDO map, state-machine behavior, and measured bus trace	Vendor timing data, conformance status, and integration test trace

Risk, Boundary, and Mitigation Matrix

These are the common failure modes when a CANopen motor driver is selected from a datasheet without commissioning evidence.

Risk type	Trigger	Impact	Mitigation
Misuse risk	Treating Quick Stop or control-word commands as personnel safety.	Unsafe stop assumptions during AGV hazard analysis.	Use hardware safety functions and validate against ISO 3691-4:2023 and IEC 61800-5-2.
Timing risk	Running CSV/CSP on a loaded Classical CAN bus without trace data.	Late setpoints, following error, or step loss.	Use profile modes, reduce node traffic, or select EtherCAT when coordination dominates.
Cost risk	Choosing EtherCAT only because it is faster, or CANopen only because it is cheaper.	Overbuilt controls or expensive late redesign.	Map each axis to required cycle time, safety evidence, and commissioning effort before supplier selection.
Scenario mismatch	Applying a traction-drive pattern to steering, lift, or indexing axes.	Poor hold accuracy, wrong feedback assumptions, or difficult commissioning.	Match PV, PP, CSV, or CSP to the physical axis and required fault behavior.

Scenario Examples

Each example states the premise, the recommended CANopen motor driver approach, and the decision outcome.

Two-wheel AMR traction

Premise: BLDC drive wheels, moderate speed loop, no coordinated contouring.

Recommendation: Use CANopen PV, keep velocity loop in the driver, and log bus load during acceleration and e-stop recovery.

Outcome: CANopen remains a practical cost/performance choice when STO is hardwired and PDOs are simple.

Steering module with absolute position target

Premise: The vehicle needs repeatable steering angle and a target-reached signal.

Recommendation: Prefer PP or a vendor steering mode over PV so the driver owns position closure.

Outcome: The master sends positions rather than continuously correcting velocity over CAN.

Stepper lift with CSP request

Premise: A master wants to stream position increments over CANopen to an open-loop or lightly closed-loop stepper driver.

Recommendation: Treat as high risk; move trajectory generation into the driver or prove missed-step behavior under jitter.

Outcome: The design is not released until fault, homing, and overload recovery are demonstrated.

Multi-axis synchronized mechanism

Premise: Several axes must move in a coordinated path with tight phase alignment.

Recommendation: Use CANopen only after trace-backed timing proof; otherwise shortlist EtherCAT-class drives.

Outcome: The fieldbus decision follows measured motion requirements rather than nominal protocol preference.

Research Sources & Evidence Base

CiA 402 drive profile: CiA lists operation modes, application data, PDO mapping, and safety-function parts for CANopen drives and motion control.
CAN high-speed lower layer: CiA explains CAN high-speed transmission under ISO 11898-2. Classical CAN applications should still verify bitrate, wiring, and loading in the target topology.
IEC 61800-5-2 safety functions: IEC 61800-5-2 defines functional-safety requirements for adjustable speed electrical power drive systems.
ISO 3691-4:2023 driverless trucks: ISO 3691-4:2023 covers safety requirements and verification for driverless industrial trucks and systems.
EtherCAT Technology Group brochure: ETG materials describe Distributed Clocks as the synchronization mechanism behind many EtherCAT motion systems; vendor implementation data is still required.

Evidence note: public standards pages confirm scope and terminology; supplier-specific limits such as PDO cycle time, STO category, and jitter tolerance still require the selected drive manual, EDS file, and bench measurements.

Last updated: June 2026

Tool method

The evaluator classifies architecture risk from control mode, motor technology, and axis duty. It intentionally does not claim exact bus load without frame-level input data.

Known evidence

Public standards pages support the role of CiA 402, ISO 3691-4, and IEC 61800-5-2. The page uses those sources for scope and terminology, not supplier-specific performance claims.

Unknown until tested

Cycle-time margin, actual jitter, STO implementation, firmware behavior, and optional object support remain unknown until the selected driver is reviewed and tested.

Turn the result into a supplier check

Use this page to narrow the CANopen motor driver architecture, then move to the adjacent engineering checks before requesting a quote.

Check CANopen bus fitCompare bitrate, node count, and topology limits for the whole drive network.Build the driver evidence packTranslate CiA 402 objects, EDS files, and PDO maps into commissioning evidence.Request an AMR drive reviewSend motor type, voltage, load profile, safety target, and fieldbus preference for an engineering response.

Frequently Asked Questions

Selection

What makes a motor driver a CANopen motor driver?

It should expose CANopen communication, normally including a device profile such as CiA 402 for drives and motion control. Ask for the EDS file and object dictionary before treating it as a standard interoperable drive.

Is CANopen enough for AMR traction?

Often yes when each drive closes its velocity loop locally and the master sends profile targets. The decision changes when the vehicle needs tightly coordinated multi-axis motion or very short synchronous cycles.

Should steering use Profile Velocity or Profile Position?

Profile Position is usually easier to verify for steering because the driver can own target position, limits, and target-reached behavior. PV can work, but the master must close more of the position loop.

Can brushed DC, BLDC, and stepper drivers share one CANopen bus?

They can share a bus if bitrate, node IDs, termination, and profile support are compatible. Mixed motor technology increases commissioning work because each drive may expose different optional CiA 402 objects.

Evidence

Why do I need an EDS file?

The Electronic Data Sheet tells the master which objects, data types, access rights, PDO mappings, and optional modes the specific firmware supports. It is the fastest way to catch marketing-level CANopen claims.

What should a supplier provide beyond the datasheet?

Ask for the EDS file, PDO examples, supported CiA 402 modes, fault-state behavior, STO documentation if claimed, firmware revision, and a sample trace or commissioning guide for your target mode.

Can the page calculate exact bus load?

No. Exact load needs bitrate, frame count, payload length, SYNC period, heartbeat timing, emergency traffic, and node count. This page screens architectural fit and tells you which measurements to request.

What date applies to the standards references?

The page was reviewed in June 2026. ISO 3691-4:2023 is cited for driverless truck safety context, while IEC 61800-5-2 is cited for drive safety functions.

Risk

Does a CANopen driver support safety over the bus?

Standard CANopen commands are not a safety layer. CANopen Safety exists, but many AGV designs still rely on hardwired safety functions such as STO and document that behavior in the vehicle risk assessment.

Why is CSP risky for steppers?

CSP streams frequent position setpoints. If arbitration, SYNC jitter, or driver buffering exceeds the stepper margin, missed steps or following errors can appear before the master notices.

When should I switch from CANopen to EtherCAT?

Switch when coordinated motion, short deterministic cycles, or vendor-proven distributed-clock behavior becomes a core requirement. Keep CANopen when simple local profile modes and lower integration cost meet the requirement.

What is the minimum bench test before vehicle trials?

Run the selected mode at target bitrate, cable length, node count, load profile, and fault conditions. Save the analyzer trace, drive status word transitions, and STO or stop-response evidence.