Allen-Bradley 1756-L6 Series, Reference Manual, Page: 98 / 134

98 Rockwell Automation Publication 1756-RM001I-EN-P - May 2012
Appendix A Reaction Times of the ControlLogix System
For Analog Modules
Use this formula to determine worst-case reaction time for analog modules in
local or remote configurations:
Worst-Case Reaction Time with no faults or errors =
(Real Time Sample (RTS) Rate) +
(Input Module RPI x 4/8/16…
≥
100 ms)
(1)
+ (SIL 2 Task SIL 2 Task Watchdog) +
(Output Module RPI x 4/8/16…
≥
100 ms)
(1)
+ (Output Module Delay).
Filter time and RTS are configurable via the Configuration tab on the Module
Properties dialog box in the programming software. Module RPI is configurable
via the Connection tab.
Figure 54 - Analog Module Configuration
Refer to the ControlLogix Analog I/O Module User Manual, publication
1756-UM009 , for information on setting filter and RTS values.
(1) Multiply the module RPI by 4, then 8, then 16, and so on, until the result is at least 100 ms.