What causes KUKA Robot alarm KRC0028?

Damaged or loose connector between RDW and DSE modules. Broken or corroded wiring in the RDW-DSE communication cable. Faulty RDW module requiring replacement. Defective DSE module or safety relay board. Poor electrical contact or oxidation at connector pins.

How do I fix KUKA Robot alarm KRC0028?

1. Power down the KRC controller completely and wait 30 seconds before power-on reset 2. Inspect the physical connectors between RDW and DSE modules for loose connections, corrosion, or bent pins 3. Reseat both connectors firmly and ensure they are fully engaged with audible click feedback 4. Visually inspect the RDW-DSE communication cable for visible damage, kinks, or exposed wires 5. Use a multimeter to verify continuity on all pins in the RDW-DSE connector in powered-down state 6. If issue persists, replace the communication cable first, then test; if still unresolved, contact KUKA service for RDW or DSE module replacement

KUKA Robot codes

axismd.ai

KUKA Robot Controller

Servo/Axis · Advanced

Alarm KRC0028

KUKA Robot KRC0028 - TRANSMISSION ERROR DSE RDW **

This alarm indicates a communication transmission error or open circuit between the RDW (Roboter-Daten-Wartung/Robot Data Maintenance) module and the DSE (Digitale Sicherheitseinheit/Digital Safety Unit) in the KUKA KRC controller. The safety circuit is broken, preventing proper data exchange between the robot control system and the safety monitoring module, which halts robot operation to prevent unsafe conditions.

KUKA RobotServo/AxisAdvanced

KRC0028

KUKA Robot KRC0028 - TRANSMISSION ERROR DSE RDW **

TRANSMISSION ERROR DSE RDW **

Common Causes

Damaged or loose connector between RDW and DSE modules
Broken or corroded wiring in the RDW-DSE communication cable
Faulty RDW module requiring replacement
Defective DSE module or safety relay board
Poor electrical contact or oxidation at connector pins

Troubleshooting Steps

1Power down the KRC controller completely and wait 30 seconds before power-on reset
2Inspect the physical connectors between RDW and DSE modules for loose connections, corrosion, or bent pins
3Reseat both connectors firmly and ensure they are fully engaged with audible click feedback
4Visually inspect the RDW-DSE communication cable for visible damage, kinks, or exposed wires
5Use a multimeter to verify continuity on all pins in the RDW-DSE connector in powered-down state
6If issue persists, replace the communication cable first, then test; if still unresolved, contact KUKA service for RDW or DSE module replacement

Seeing Multiple Alarms?

Seeing another alarm with this one? Enter the code.

Get machine-aware diagnosis

AxisMD logs alarms against your actual machines, tracks patterns, and gives AI context your manual doesn't have.

Start free

Was this guide helpful?

Always verify with your machine manual or a certified technician before performing service procedures.