Siemens A1940 fault code meaning

Series: V90

PROFIdrive: Isochronous synchronization not achieved

servo drive

Meaning: Message category: Communication fault between the drive and the host controller (9) The bus is exchanging data, and isochronous synchronization is selected via the configuration telegram. Synchronization with the cycle specified by the master cannot be achieved. Although isochronous mode is selected in the bus configuration, the master is not sending an isochronous global control telegram. The master uses a different isochronous DP cycle from the cycle in the configuration telegram transmitted to the slave. At least one drive object has pulse enable active (not controlled via PROFIdrive). Enable pulses only after the PROFIdrive drive is synchronized.

Possible causes

Source: SINAMICS V90 PROFINET, SIMOTICS S-1FL6 Operating Instructions P389