Application document for functional safety STO, SS1 (ISO 13849-1)
Compact User Manual, 09/2016, A5E34871844AM
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The following two block diagrams show the two-channel architecture of the safety system, so
that after the first two faults – each in one of the two channels – the system can fail.
Safety block diagram of a drive without field excitation
Safety block diagram of a drive with field excitation
Path 3 is not considered to be a safety-related switch-off signal path as the field remanence
of the DC motor – for a high armature current – can result in the motor developing a torque.
On the following page, as in 4.2, the function blocks are colored the same as in the previous
block diagram as example.
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