KUKA Robot codes
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KUKA Robot Controller

System · Basic

Alarm KRC0972

KUKA Robot KRC0972 - DIGITAL INPUT EXPECTED 2309

This alarm indicates that a digital input signal was expected at input 2309 but was not detected or is in an unexpected state. The robot controller anticipated a digital input acknowledgment or status signal that failed to arrive within the expected timeframe or with the correct logic level.

KUKA RobotSystemBasic

KRC0972

KUKA Robot KRC0972 - DIGITAL INPUT EXPECTED 2309

DIGITAL INPUT EXPECTED 2309

This alarm indicates that a digital input signal was expected at input 2309 but was not detected or is in an unexpected state. The robot controller anticipated a digital input acknowledgment or status signal that failed to arrive within the expected timeframe or with the correct logic level.

Common Causes

  • Digital input 2309 hardware connection is loose, disconnected, or corroded
  • Input module or terminal block failure preventing signal detection
  • External device or sensor connected to input 2309 is malfunctioning or powered off
  • Incorrect wiring polarity or shorted digital input circuit
  • KRL program logic error expecting input before device is ready to respond

Troubleshooting Steps

  1. 1Verify physical wiring connections to digital input 2309 are secure and inspect for corrosion or damage
  2. 2Test the external device or sensor connected to input 2309 independently to confirm proper operation
  3. 3Use the KUKA teach pendant diagnostics menu to monitor the real-time status of input 2309
  4. 4Check the KRL program logic sequence to ensure inputs are expected only after corresponding outputs or commands are issued
  5. 5Measure voltage at input 2309 terminals with a multimeter to confirm signal presence (typically 24V for logic 1, 0V for logic 0)
  6. 6If voltage is correct but alarm persists, test or replace the input module card or digital input terminal block

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