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ErrorLib — Industrial Fault Code Library

Disclaimer: ErrorLib is an independent technical reference tool. While we aim for accuracy, always verify with the manufacturer’s official service manuals before performing maintenance on industrial equipment. ErrorLib is not affiliated with the brands listed.

20

PROFIsafe Communication Error (V2 CPU)

ABB · PB610 Panel Builder 600 Programming Software

What does 20 mean?

A PROFIsafe communication error has occurred with an AC500 V2 non-safety CPU PM5xx. This means the safety module cannot correctly exchange telegrams with the safety CPU, leading to a safe state.

Common Causes

  • Loss of PROFIsafe communication between safety devices and the V2 CPU.
  • Network configuration error or cable fault in the PROFIsafe network.
  • Failure of the PROFIsafe communication stack on either the V2 CPU or the safety device.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Restart the affected module.

Browse all codes in this manual (58)
Verified technical data. Last updated: April 2026

Related Faults

1Safety Destination Address Not Valid (V2 CPU)10Parameter F_SIL Exceeds Specific Application SIL (V2 CPU)11Safety Watchdog Time Zero (V2 CPU)
Source: ABB PB610 Panel Builder 600 Programming Software
Open Manual (Page 434)Search more codes in this manual