Fault codeA1940
The bus is in the data exchange state and clock synchronous operation has been selected using the parameterizing telegram. It was not possible to synchronize to the clock cycle specified by the master. The manual's first action is: “Check the master application and bus configuration.”
- Model
- Siemens SINAMICS V90, SIMOTICS S-1FL6
- Display shows
- PROFIdrive: clock cycle synchronism not reached (A1940)
- Type
- Fault code
- Source
- Manual p. 305
What A1940 means
PROFIdrive: clock cycle 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. It was not possible to synchronize to the clock cycle specified by the master. p. 305
What to do
- Check the master application and bus configuration. p. 305
- Check the consistency between the clock cycle input when configuring the slave and clock cycle setting at the master. p. 305
- Check that no drive object has a pulse enable. Only enable the pulses after synchronizing the PROFIdrive. p. 305
Before you service the product, read the safety instructions in the manual p. 2.
If A1940 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 A1940; 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.