198 Appendix: Safe Torque Off (STO)
STO software functional diagram:
MicroFlex e190
SAFETORQUEOFF(6)
SAFETORQUEOFF(1)
SAFETORQUEOFF(0)
SAFETORQUEOFF(2)
X4:1
X4:2
STO1
STO2
STO
Monitoring the delay between the STO inputs
The STO function monitors the switching time difference between the STO inputs.
See Operation of the STO function and diagnostics on page 195.
STO function activation and indication delays
Hardware activation delay (the delay between removing power from an STO input
and switching off the drive output bridge): < 50 ms.
Hardware indication delay (the delay betwee
n switching off the drive output bridge
and being indicated to the Mint program): < 50 ms.
Software STO indication delay, Mint program (the delay between a mismatch
o
ccurring on the STO inputs and being indicated to the Mint program): < 200 ms user
defined period, set by STOINPUTMISMATCHTIME.
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