F4001 Double MST failure shutdown
Disturbance in the optic fiber transmission line
Attenuation of light signals too high
Different SERCOS cycle times in master and slave
Disturbance in SERCOS interface (general)
Supported by Firmware Variant:
The master synchronization telegram (MST) was not received in the drive
in two successive SERCOS cycles.
Check all optic fiber connections in the SERCOS ring
and replace them, if necessary
Measure attenuation of optic fiber cables again.
Maximum attenuation between TX and RX mustn't
exceed 12.5 dB!
Check SERCOS cycle times in master and slave and
adjust them, if necessary
Replace control section or entire drive controller
Only Rexroth service engineers or especially trained users are
allowed to replace the control section. The replacement of the
entire drive controller is described in the Project Planning
Manual for the power section.
See also Functional Description "Interface Errors and Diagnostic
F4001 - Attributes