Controller Specifications; System Reaction Time; Safety Task Reaction Time - Allen-Bradley GuardLogix 5580 Original Instructions Manual

Controller Specifications

System Reaction Time

These publications list the specifications and the agency certifications for the
products:
• ControlLogix Controllers Technical Data, publication
• 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.
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.
Sensor Reaction Input Reaction
Time Time
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.
IMPORTANT For more information on reaction time calculation, see
page 79.

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.
Rockwell Automation Publication 1756-RM012B-EN-P - April 2018
Safety Integrity Level (SIL) Concept
Safety Task Output Reaction
Reaction Time Time
Chapter 1
1756-TD001
Actuator
Reaction Time
Appendix C on
13