Rockwell Automation 1715-OF8I Redundant I/O System User Manual - Manual (Page 215)

Rockwell Automation Publication 1715-UM001C-EN-P - March 2014 215
1715 Redundant I/O System in SIL 2 Safety Applications Chapter 6
The default value for the CRTL is 10,000 ms. The valid range is
1000…60,000 ms.
Considerations for Setting the CRTL
The value of the CRTL forms part of the safety considerations for the system.
You are responsible for calculating and verifying that the CRTL meets the safety
reaction time for your safety function.
• In a 1715 system, the CRTL value is assigned to individual modules during
module configuration.
• If the input CRTL is not met, the controller presents fail-safe input values
to the application logic. Each time a valid packet is received from an input
module, the controller resets the CRTL. If the CRTL ever times out, the
controllers present fail safe input values to the application logic.
IMPORTANT When online, the Reset button on the SIL 2 Safety tab appears solid when only
the output data on any 1715 output module needs to be reset. See pages
218
and 244 .
The Reset button resets only output data for output modules, that is, the
1715-OF8I and 1715-OB8DE module outputs.
To reset inputs for all 1715 modules, you must use the Reset Input parameter
within the Add-On Instructions. See
Performing a SIL 2 Reset on page 243 .
IMPORTANT For information about how to configure the safety reaction time for your safety
application, see page 219 .