Use a controlled triage sequence rather than repeated resets: preserve the alarm and event history, make the cell safe, classify the failure, verify physical prerequisites, then check configuration, references and program logic one change at a time. This approach separates a safety stop from a network fault, a mismatched robot from a bad path, and a peripheral failure from a defective robot controller.
The exact checks depend on the robot family, controller, software revision, option package, PLC, network and cell safety design. The procedures below are cross-vendor guidance for isolating a fault; once an alarm identifies a specific device or model, follow that equipment’s current manual and your site’s qualified service process.
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Start with evidence, not a reset
An integration fault is easiest to diagnose while its original state is intact. A reset can clear the only useful clue, change the sequence of events or make an intermittent wiring problem appear to have been fixed. Treat the first response as data capture and risk control.
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Record the complete state
- Copy the complete alarm text, numeric code and any secondary messages from the pendant, controller, PLC, safety controller, CNC or vision computer. Record the timestamp.
- Write down the robot arm model, controller model, serial-number pairing and installed option or application package. For a Mitsubishi tracking package, the identification plate specifies which arm and controller serial numbers belong together; a mismatch can produce incorrect displayed and actual positions.
- Capture software and firmware revisions for the robot, PLC, network interface, vision system and other devices involved. Haas troubleshooting specifically treats software level and robot/CNC addressing compatibility as possible causes.
- Describe the cell state: automatic, manual, teach, servo on or off, program step, conveyor position, part present, gate or door status and which devices were powered.
- Record the event immediately before the failure. A communication timeout after a power cycle points to a different branch than a stop that occurred during a collision, jog or tool change.
- Save controller, PLC and network diagnostics or logs when your site procedure permits it. Preserve the program, parameter backup and error report needed by the equipment supplier; Haas asks for error-report information and program or backup details when troubleshooting its package.
Do not edit a path, change an IP address or clear a safety input until this record is complete. If the event cannot be reproduced safely, the record may be the only evidence available to the next technician.
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Make the cell safe before diagnosis
Use the cell’s approved lockout, guarded-recovery and teach-mode procedure. Never bypass an interlock, jumper a stop input or repeatedly reset a safety stop to restore production. Read the exact safety message and identify the configured device or limit that initiated it. ABB’s guidance states: “Check which safety device caused the stop.”
Possible initiators include an opened stop input, a collision or motion-supervision event, entry into a protected area, or configured tool-force or tool-speed limits. The safety controller’s indication and the electrical drawings should identify the initiating channel. Correct the physical or configuration cause through the site’s authorized process, then validate the safety function before allowing motion.
Classify the symptom
Choose a diagnostic branch before changing a setting. Use these categories:
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- Safety or enable: a safety device, configured limit or stop event prevents servo enable or motion.
- Power or wiring: a controller, hub, camera, encoder or interface is unpowered, miswired or intermittently connected.
- Communication: endpoints cannot establish or maintain a robot-to-PLC, CNC, vision or socket connection.
- Configuration: IP addressing, subnet or gateway, firewall, socket, device or communication parameters disagree.
- Hardware identity or reference: the arm/controller pairing, mastering, calibration, tool frame or workobject is wrong.
- Program logic: syntax, sequencing, interlocks or command conditions prevent an otherwise healthy system from executing.
- Peripheral: vision, encoder, conveyor, gripper or other external equipment fails while the robot core remains available.
Choose the next branch from the observed state
| Observed state | First branch | Checks to perform first | Do not do |
|---|---|---|---|
| The robot will not move or a stop will not clear | Safety and enable | Read the exact message; inspect the indicated safety device, circuit and supervision condition; check the safety controller indication. | Do not defeat the input or keep resetting without identifying its source. |
| Both devices are on, but no command or data passes | Physical link, then configuration | Power, cable and port path; IP, subnet and gateway; firewall; required setup; controller and PLC diagnostics. | Do not assume the robot controller is defective before checking the other endpoint. |
| The robot reaches a different position or posture | Hardware identity and reference | Arm/controller serial pairing, mastering or calibration, tool and workobject frames, and recent maintenance or movement while powered down. | Do not compensate by editing points first. |
| Vision or conveyor tracking fails | Peripheral dependencies | Camera, controller and PoE hub power; cabling and network; firewall; encoder power, wiring, parameters and mechanical rotation. | Do not tune path points while the measurement or tracking source is invalid. |
| The controller or OEM box is unstable or will not start | Supply and polarity | Use the exact controller specification and approved measurement procedure to verify input voltage, wiring and polarity. | Do not apply a voltage or polarity assumption from another robot family. |
When the robot will not move or a stop will not clear
Read the initiating condition
Start at the pendant or controller message, not at the program. An opened safety device on stop inputs can prevent operation. ABB examples also include collision or motion supervision, entry into a safe area, and tool-force or tool-speed supervision. Check the circuit diagram and safety controller’s channel or zone indication to find the initiating device.
If the stop followed a contact or unexpected load, inspect the cell for an obstruction, fixture shift or tool interference according to the approved recovery method. If it followed entry into a configured safe area, verify the zone and the device that reports it rather than changing the zone limits as a shortcut. If a tool-force or tool-speed limit caused the stop, confirm the configured condition and the physical tool state before changing a limit.
Separate safety from program execution
A cell can be safe and enabled yet still refuse a command because the program is waiting for an input, has an invalid branch or contains a syntax error. ABB recommends checking the program for detailed errors or evaluating it in RobotStudio when the message indicates program syntax. Treat that as a program branch only after the safety chain and enable conditions are normal.
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Recover deliberately
After correcting the initiating condition, use the cell’s guarded recovery or teach procedure. Verify that the robot’s current position, tool and workobject are known before moving. Test the stop and restart sequence at reduced risk under the commissioning procedure, and document which device caused the stop and what was corrected.
When the robot, PLC, CNC or vision system will not communicate
Communication failures have several independent layers. Work from power and physical connectivity upward; otherwise a correct IP setting can hide an unplugged hub and a new cable can conceal a firewall or socket error.
1. Verify power and the physical path
- Confirm that both endpoints are powered and fully booted. Include required interface modules, switches or hubs and, for a camera connection, the PoE hub.
- Inspect each cable, connector and physical port from the robot controller to the PLC, CNC, vision computer or hub. Reseat only under the site’s safe electrical procedure and look for bent contacts, damaged jackets or an incorrect port.
- Check link or activity indications and the device’s own diagnostics. A missing link indication keeps the investigation at the physical layer.
Mitsubishi’s tracking documentation lists an unpowered vision system, robot controller or PoE hub and unconnected cables among causes of setup failures. Haas likewise lists cable and interface wiring in its robot-package troubleshooting.
2. Check addressing and network policy
Compare the configured IP address, subnet mask and gateway at both endpoints and at any intermediary device. A device can be powered and linked while still unreachable because the addressing plan is incompatible. Confirm that the intended network interface is being used, then inspect the Windows firewall or equivalent host firewall. Mitsubishi specifically identifies incompatible IP, subnet or gateway settings and firewall blocking as causes of tracking communication failures.
Do not invent a new address to make a test pass. Use the current equipment manual and the site’s approved address list, and record every change so the original configuration can be restored.
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Some integrations require an option package, device definition, communication parameter set or explicit socket sequence in addition to ordinary network connectivity. Mitsubishi CR800 examples distinguish socket-open, send and receive errors. For those faults, establish the socket connection as specified, check cables and devices, verify robot communication parameters, and confirm the PLC IP and external-device settings.
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A socket-open error points to connection establishment; a send or receive error may occur after the connection exists. Use the controller and PLC diagnostics to determine which stage failed instead of changing all parameters at once.
4. Check software and address compatibility
Confirm that the robot, CNC or PLC software level supports the installed package and that the robot and CNC addresses match the documented configuration. Haas identifies software level and mismatched robot/CNC addressing as package troubleshooting factors. If a recent upgrade preceded the fault, compare the saved parameter and program backups with the active configuration before rolling back or reloading anything.
When position or path differs from the expected result
Confirm the physical identity first
Verify that the installed robot arm and controller are the documented matched pair. Mitsubishi’s tracking package uses a plate identifying the arm and controller serial numbers to be combined; a mismatch can make the actual posture or position differ from what the pendant displays. Resolve identity before touching points or offsets.
Verify mastering and calibration
Check mastering or calibration status and the physical reference marks using the applicable procedure. Haas notes that arcing motion during Cartesian single-axis jogging can indicate that joint mastering marks do not line up and directs users to its mastering procedure. Do not infer a calibration value from another model or controller revision.
Ask whether the arm was moved while powered down, struck, or serviced. Those events can invalidate the reference. Inspect the tool frame and workobject or user frame, and confirm that the program is using the intended values. A correct robot with the wrong frame can produce a consistent but displaced path; changing individual points would only hide the underlying reference error.
Revalidate after correction
Once identity and reference data are correct, test a known position under the cell’s recovery and commissioning controls. Compare the commanded and observed posture, then run the relevant path at a safe speed with the fixture and tool present as permitted by the risk assessment. Record the mastering, calibration or frame change and retain the previous backup.
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When vision or conveyor tracking fails
Tracking adds dependencies that can fail even when the robot controller itself is healthy. Use the following order for the Mitsubishi tracking-application example, adapting parameter names only from the manual for your controller and package.
Vision and PoE checks
- Confirm power to the camera, robot controller and PoE hub.
- Identify which hub port supplies PoE and verify that the camera is connected to that port.
- Check PC-to-device cabling and the physical link.
- Verify that the devices use the compatible IP system, subnet and gateway arrangement.
- Check the host firewall and the tracking application’s device configuration.
- Read the robot and vision diagnostics to determine whether failure occurs during discovery, connection or data transfer.
A camera that is powered but connected to a non-PoE port can resemble an addressing problem. Keep power, port and network findings separate in the service record.
Encoder and conveyor checks
- Confirm power to the controller and encoder.
- Inspect encoder wiring, connector pinout and the controller’s encoder parameters.
- Verify that the encoder pulley actually rotates with conveyor travel; a stationary or slipping pulley cannot provide valid tracking distance.
- Compare the observed conveyor direction and counts with the documented configuration before changing scale or direction parameters.
These checks establish whether the measurement source is alive and mechanically coupled. Only after that should you investigate tracking timing, part registration or robot path behavior.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.When a controller or OEM control box is unstable or will not start
Use the exact controller manual for supply limits, connector identification and safe measurement. Universal Robots’ OEM control-box troubleshooting for software 5.24 instructs users to check DC input against the technical specifications and verify polarity. It warns that reverse polarity causes permanent damage to that OEM control box.
That warning is not a voltage specification for other robots. Do not transfer the value, connector pinout or polarity assumption to an ABB, Mitsubishi, Haas or another controller. A digital multimeter is an appropriate general diagnostic instrument only when the equipment procedure calls for it and the person testing is qualified to work on the energized or isolated circuit. Follow the site’s electrical safety rules; the cited guidance does not authorize live testing by unqualified personnel.
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Use a one-change-at-a-time test loop
Once the branch is selected, make the smallest justified correction and observe the result.
- State the hypothesis in one sentence, such as “The PLC cannot open the socket because its configured peer address is wrong.”
- Change only the parameter, cable or physical condition that tests that hypothesis.
- Repeat the same controlled start or test sequence and capture the resulting alarm or diagnostic state.
- Decide whether the evidence confirms, rejects or leaves the hypothesis unresolved.
- Record the old and new value, operator, time and result before selecting the next test.
Changing an IP address, firewall rule, cable, mastering value and program point in one session destroys the comparison needed to find the cause and makes rollback difficult.
Validate the cell before returning it to production
A cleared alarm is not proof that the integration is healthy. After a correction, follow the site’s commissioning or recovery sequence:
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- Verify the robot’s identity, mastering or calibration, tool and workobject frames if the fault involved position.
- Check that the PLC, CNC, vision system, encoder and other interfaces complete their expected handshake or data exchange.
- Run the affected program or tracking sequence in the approved manual or reduced-risk mode before automatic production.
- Observe at least one complete intended sequence and check that no new alarms, timeouts or unexpected motion occur.
- Update the backup and maintenance record with the final configuration and the evidence that justified the change.
The cited vendor troubleshooting documents are model-specific references, not replacements for the cell risk assessment, electrical drawings, service instructions or qualified authorization required at your site.
What to send when escalating
Escalation is faster when the receiving engineer can reproduce the state. Package the following without omitting the original alarm:
- Complete alarm text and code, timestamps and the event immediately before failure.
- Robot and controller models, serial-number pairing, software revisions and option or tracking package version.
- PLC, CNC, vision, hub and encoder models, addresses and relevant diagnostics.
- Cell state, safety-device indication and the recovery steps already performed.
- Program, parameter and controller backups permitted by site policy.
- Network diagram or port path, cable changes, measured supply conditions and polarity checks where applicable.
- A chronological list of each test, the single change made and the observed result.
For unresolved safety stops, suspected damaged hardware, unmatched arm and controller identity, invalid mastering or repeated communication failures, keep the cell out of production until the authorized service or engineering function has accepted the risk and recovery plan.
Reference-specific cautions
| Equipment or guidance | What it establishes | Boundary |
|---|---|---|
| ABB collaborative-robot troubleshooting | Safety-stop inputs, collision and motion supervision, safe-area entry, tool-force or tool-speed limits, and program-error checking. | Use the alarm and cell-specific safety design; it is not a universal reset procedure. |
| Mitsubishi Electric tracking application | Matched arm/controller identity, camera and PoE power, network and firewall checks, and encoder/conveyor dependencies. | Apply its parameter names and package steps only to the applicable controller and application family. |
| Mitsubishi Electric CR800 support material | Socket-open, send and receive error examples and checks for cables, communication parameters and PLC network settings. | Socket behavior and settings vary by protocol and controller revision. |
| Universal Robots OEM control box, software 5.24 | DC input and polarity verification; reverse polarity can permanently damage that OEM box. | Do not reuse its electrical limits or pinout for another robot. |
| Haas robot-package troubleshooting | Cable and interface wiring, software and address compatibility, mastering alignment and error-report information. | Use the current package manual and the documented robot/CNC combination. |
The most reliable diagnosis is the one that preserves the original state, identifies the initiating condition, tests the simplest physical and configuration causes first, and leaves a traceable record of every change.
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