5 pulses (arg n)

K-bus Register Communication Error

Beckhoff · CX2100-0914 Embedded PC

What does 5 pulses (arg n) mean?

The K-bus ERR LED flashes 5 times, with 'n' pulses in the argument sequence, indicating an error in the register communication specifically with Bus Terminal 'n'. This typically points to an internal fault within that particular terminal.

Common Causes

  • Communication error with K-bus register data.
  • Timeout during read/write access to a bus terminal register.
  • Data corruption in K-bus register transfers.
  • Faulty bus terminal preventing register access.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Replace the Bus Terminal located at position 'n' within the K-bus segment, as it is likely defective.

Browse all codes in this manual (19)
Verified technical data. Last updated: March 2026

Related Faults

Source: Beckhoff CX2100-0914 Embedded PC