8.5.2 Safe Torque Off (STO) and Safe Brake Control (SBC)
The response time of the STO function is the time between selecting the function and the
function becoming active.
Response times when selected via PROFIsafe
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Figure 8-1 Response times when selected via PROFIsafe
Table 8-2 Response times when using the basic functions
Function Selection
via
Response Response time
Worst case for a fault-free
inverter
Worst case for an inverter
fault
STO PROFIBUS STO is active 14 ms 14 ms
PROFINET 14 ms + bus cycle time
1)
14 ms + bus cycle time
1)
SBC PROFIBUS Signal change at
the output of the
Safe Brake Relay
16 ms 30 ms
PROFINET 16 ms + bus cycle time
1)
30 ms + bus cycle time
1)
1)
Bus cycle time: Time for cyclic data exchange via PROFINET
Table 8-3 Response times when using the extended functions
Function Selection
via
Response Response time
Worst case for a fault-free
inverter
Worst case for an inverter
fault
STO PROFIBUS STO is active 54 ms 56 ms
PROFINET 54 ms + bus cycle time
1)
56 ms + bus cycle time
1)
SBC PROFIBUS Signal change at
the output of the
Safe Brake Relay
56 ms 62 ms
PROFINET 56 ms + bus cycle time
1)
62 ms + bus cycle time
1)
1)
Bus cycle time: Time for a cyclic data exchange via PROFINET.
System properties
8.5 Response times after selection
Safety Integrated - SINAMICS G110M, G120, G120C, G120D and SIMATIC ET 200pro FC-2
374 Function Manual, 01/2017, FW V4.7 SP6, A5E34261271B AD
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