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
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. |
Logic Chain Using Produced/Consumed Safety Tags
This section describes the Logix system reaction time for any input to controller A logic to controller B logic to output chain.
Reaction Time with Produced/Consumed Safety Tags
The Logix system reaction time for any input to controller A logic to controller B 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 |
C | Safety task period plus safety task watchdog time for controller A |
D | Produced/consumed safety connection reaction time limit |
E | Safety task period plus safety task watchdog time for controller B |
F | Safety output connection reaction time limit |
G | Safety output device reaction time |
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