The drive cannot synchronize with the master sign-of-life because the bus is in data exchange state and clock synchronous operation was selected using the parameterizing telegram. The manual's first action is: “Ensure that the master correctly increments the sign-of-life in the master application clock cycle Tmapc.”
- Model
- Siemens SINAMICS V90, SIMOTICS S-1FL6
- Display shows
- PROFIdrive: Sign-of-life synchronism not reached (A1944)
- Type
- Fault code
- Source
- Manual p. 305
What A1944 means
PROFIdrive: Sign-of-life synchronism not reached p. 305
Common causes
- The bus is in the data exchange state and clock synchronous operation has been selected using the parameterizing telegram. Synchronization with the master sign-of-life (STW2.12...STW2.15) could not be completed because the sign-of-life is changing differently to how it was configured in the Tmapc time grid. p. 305
What to do
- Ensure that the master correctly increments the sign-of-life in the master application clock cycle Tmapc. p. 305
Before you service the product, read the safety instructions in the manual p. 2.
If A1944 is still not resolved
- Contact service / dealer for assistance p. 2 “Qualified Personnel The product/system described in this documentation may be operated only by personnel qualified for the specific task in accordance with the relevant documentation, in particular its warning notices and safety instructions.”
- Contact service / dealer for assistance p. 13 “NOTICE Property damage due to loose power connections Insufficient tightening torques or vibration can result in loose power connections. This can result in damage due to fire, device defects or malfunctions.”
This page summarises what the manufacturer’s manual says about A1944; each statement links to the page it comes from, and quoted lines are copied word for word. It is not a substitute for the manual or for a qualified installer. ManualLib is not affiliated with Siemens. Found a mistake? Report an error.