Pilz PNOZmulti Safety Controller Troubleshooting and Maintenance Guide

Typical Fault Case Quick Reference Table

Possible causes and solutions for the phenomenon

The RUN light of the basic unit is off, DIAG flashes, and the project is not loaded or the chip card is damaged. Download the project again; Replace chip card

If the input circuit is short circuited, disconnected, or the test pulse configuration is incorrect, check the input terminal voltage; Ensure that the test pulse is only used for passive contacts

O FAULT is always on, output overload or feedback loop is disconnected, measure output current; Check feedback contacts

The speed module has no response, and the encoder power supply is insufficient or the configured frequency exceeds the range of 5V/24V measurement encoder; Check if the input frequency is ≤ 500kHz

PROFIBUS communication interruption station address is duplicated or the terminal resistance is not connected to modify the station address; Set terminal resistors on the bus connector

If the system response time is too long, additional filtering delay or excessive number of stage connections, check the input filtering time in the configuration; Reduce cascading modules

Unable to start project after downloading. Unsupported module combinations were used to check system extension limitations (up to 8 on the right and 4+1 on the left)