Factors That Affect Logix Reaction-Time Components - Allen-Bradley GuardLogix 5580 Original Instructions Manual

Factors That Affect Logix
Reaction-time Components
4. Produced/Consumed Safety Connection Reaction Time Limit
(Read from the Safety tab of the consumed tag connection.)
5. Safety Task Period plus Safety Task Watchdog time for Controller B
6. Safety Output Connection Reaction Time Limit
7. Safety output device reaction time
A number of factors can influence the Logix Reaction Time components that
are described in the previous sections.
Table 11 - Factors Affecting Logix System Reaction Time
These Reaction Time Components
Input device delay
Safety Input Connection Reaction Time
Limit
Safety Task Period and Safety Task
Watchdog
Produced/Consumed Safety Connection
Reaction Time Limit
Output Connection Reaction Time Limit
Output module delay
(1) Network traffic and EMC create a lower limit for the values you can successfully use for Timeout Multiplier and Network Delay
Multiplier.
(2) The instructions in your safety task and any higher priority tasks in the controller create a lower limit for the values you can
successfully use for Safety Task Period and Safety Task Watchdog
The following sections describe how to access data or settings for many of these
factors.
Rockwell Automation Publication 1756-RM012B-EN-P - April 2018
Reaction Times
Are Influenced by the Following Factors
Input device reaction time
On-Off and Off-On delay settings for each input channel, if applicable
Input device settings for:
• Requested Packet Interval (RPI)
• Timeout Multiplier
• Network Delay Multiplier
The amount of network communication traffic
(1)
The EMC environment of the system
Safety Task Period setting
Safety Task Watchdog setting
The number and execution time of instructions in the safety task
Any higher priority tasks that pre-empt safety task execution
Consumed tag settings for:
• RPI
• Timeout Multiplier
• Network Delay Multiplier
The amount of network communication traffic
(1)
The EMC environment of the system
Safety Task Period setting
Output device settings for:
• Timeout Multiplier
• Network Delay Multiplier
The amount of network communication traffic
(1)
The EMC environment of the system
Output module reaction time
Appendix C
(1)
(2)
(2)
(1)
(1)
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