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Rockwell Automation Publication 35-UM001A-EN-P - May 2022
Chapter 6 Safety Functions
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.
shows the safety reaction time from an input signal condition that triggers a
safe stop, to the initiation of the configured Stop Type. For details on how to
calculate system reaction times with GuardLogix controllers, see the
GuardLogix Controller Systems Safety Reference Manuals that are listed in the
Additional Resources on page 13
.
Table 19 - Safety Reaction Time
A number of factors influence the safety reaction time, including the
configuration of the safety I/O on your device and the configuration of your
safety controller. These factors include:
•
Safety Input On to Off and Off to On delay settings, if applicable
•
Safety Input Connection Reaction Time Limit settings
•
Safety controller Safety Task Period and Watchdog settings
•
Produced and consumed safety Connection Reaction Time Limit settings
•
Safety Output Connection Reaction Time Limit settings
Safety Input and Output Connection Settings (safety variants only) on
, for information on how to configure these settings.
For details on reaction time calculation of your safety system, see Reaction
Times in the GuardLogix Controller Systems Safety Reference Manual for your
safety programmable controller. These manuals are listed in the
Spurious Trip Rate
shows the Spurious Trip Rate (STR) and Mean Time to Failure Spurious
(MTTF
Spurious
) values, calculated according to the ISA TR-84 method.
IMPORTANT
Achievable safety rating depends on each system component.
For Safe Feedback, the safety rating of the selected encoders
could limit the safety rating of the system.
Function
Reaction Time
Hardwired STO
12 ms
Integrated STO
10 ms
Safety Output
10 ms
IMPORTANT
The safety reaction time that was previously listed, excludes the
connection reaction time.
Table 20 - STR and MTTF Spurious Rates
Attribute
Value
Spurious Trip Rate (per hour)
6.61 E-6
MTTF Spurious (years)
1.73 E+1
Содержание Allen-Bradley 35E
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