20 EAV64334 06/2017
Status of Safety Function
Description
If... Then ...
Safe Torque Off (STO) is not active the orange LED is OFF
STO is triggered the power bridge is locked by redundant hardware
the orange LED is steady ON
STO is displayed
[Safety Function Error] SAFF
detected fault occurs (1)
the power bridge is locked
the orange LED is steady ON
the red LED is steady ON
the Graphic Display terminal displays StO then SAFF
(1) Possible causes are exceeded delay between STOA and STOB signals > 1 s and internal hardware detected error.
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