Logix System Reaction Time

The following sections provide information on how to calculate the Logix system reaction time.

Simple Input-Logic-Output Chain

This section describes the Logix system reaction time for any simple input-logic-output chain.
Worst Case Reaction Time
Worst Case Reaction Time
The Logix system reaction time for any simple input to logic to output chain consists of the following components.
Item
Description
A
Safety input device reaction time plus input delay time, if applicable.
B
Safety input connection reaction time limit. Read from the Module Properties dialog box in the Logix Designer application, this value is a multiple of the safety input device connection RPI.
C
Controller reaction time. See Safety Task Reaction Time.
D
Safety output connection reaction time limit. Read from the Module Properties dialog box in the Logix Designer application, this value is a multiple of the safety task period.
E
Safety output device reaction time.
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