CC%2 input (NE2) not equal to 0

What does 231-E006 mean?

This error signifies a problem during the dynamic test of the second emergency-stop loop in the Heidenhain TNC CNC Controller. During this safety test, a 0V signal is expected at input NE2 within 1.5 minutes. If a 24V signal remains present, it indicates a failure in the emergency-stop circuit, compromising the machine's safety function.

• Incorrect or damaged wiring connecting to input NE2 or within the second emergency-stop loop.
• A malfunctioning emergency-stop button that fails to open its contacts, thus preventing the signal at NE2 from dropping to 0V.
• Internal hardware defect within the safety monitoring module or the input circuitry associated with NE2.

Click steps to track your progress.

1. 1

   Verify the wiring of input NE2 and the entire second emergency-stop loop for continuity, proper terminations, and any signs of damage or short circuits.

2. 2

   Inspect all emergency-stop buttons connected to the second loop for mechanical damage, correct operation, and ensure their contacts transition correctly (normally closed) when activated.

3. 3

   Measure the voltage at input NE2 during the dynamic test sequence; confirm that it transitions to 0V as expected within the 1.5-minute timeout.

4. 4

   If wiring and emergency-stop buttons are confirmed functional, consult a Heidenhain service agency for further diagnostics on potential hardware defects in the safety monitoring module.