Safety Reaction Time

The safety reaction time is the length of time from a safety-related event as input to the system until the system is in the safe state. The table below shows the safety reaction time from an input signal condition that triggers a safe stop, to the initiation of the configured Stop Type.
Safety Reaction Time
Drive Family
Network STO Reaction Time, Max
PowerFlex®
755 drives (firmware revision 13 or later), Frames 1…10
PowerFlex®
755TL drives, PowerFlex 755TR drives, and PowerFlex 755TM drives, Frames 7…15
PowerFlex®
755TS drives, Frames 1…7 and 7A
15 ms
PowerFlex®
755TL drives, Frames 5 and 6
PowerFlex®
755TR drives, Frames, 5, 6, and 6L
26 ms
IMPORTANT:
An input signal condition that is present for less than the reaction time may not result in the safety function being performed. Repeated requests of the safety function for less than the reaction time can result in a spurious detection of a fault.
IMPORTANT:
In network STO Mode, the safety reaction time does not include the connection reaction time limit.
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