Rockwell Automation Publication 1756-RM012B-EN-P - April 2018 13
Safety Integrity Level (SIL) Concept Chapter 1
Controller Specifications
These publications list the specifications and the agency certifications for the
products:
• ControlLogix Controllers Technical Data, publication 1756-TD001
• CompactLogix 5380 Controllers Specifications Technical Data,
publication 5069-TD002
Agency certifications are also marked on the product labels.
See http://www.rockwellautomation.com/global/certification/overview.page
for Declarations of Conformity, Certificates, and other certification details.
System Reaction Time
The system reaction time is the worst-case time from a safety-related event as
input to the system or as a fault within the system, until the time that the
system is in the safe state.
This worst-case definition includes the effects of asynchronous
communications, and multiple potential faults, occurring within the system.
Actual reaction times may be faster.
Each of the reaction times is dependent on factors such as the type of I/O
device and instructions that are used in the program.
Safety Task Reaction Time
The safety task reaction time is the worst-case delay from any input change that
is presented to the controller until the output producer sets the processed
output. Use this equation to determine the safety task reaction time:
Safety task reaction time = (safety task period + safety task watchdog) × 1.01
The multiplier is for potential clock drift.
IMPORTANT For more information on reaction time calculation, see Appendix C
on
page 79
.
Sensor Reaction
Time
Input Reaction
Time
Safety Task
Reaction Time
Output Reaction
Time
Actuator
Reaction Time
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