Rockwell Automation Publication 1715-UM001J-EN-P - December 2020 213
Chapter 7 1715 Redundant I/O System in SIL 2 Safety Applications
Where separate supplies power field signals, power separation must be
maintained between modules so that isolation is maintained.
Configure SIL 2 Operation To configure 1715 modules for SIL 2 applications you must enable each 1715
module in your system for SIL 2 operation, and set its connection reaction
time limit (CRTL) and module requested packet interval (RPI). In addition, for
input modules, you must configure safe state input values.
Enable SIL 2 Operation
Follow these steps to enable a module for SIL 2 operation.
1. On the Module Definition dialog box, from the Series pull-down menu,
choose Series A.
2. From the Revision pull-down menu, choose 2.001 or later.
3. From the Connection pull-down menu, choose Data.
4. From the Redundant pull-down menu, choose No for single modules
with simplex termination assemblies or Yes if you are using two modules
with duplex termination assemblies.
5. From the SIL 2 Safety pull-down menu, choose Yes.
Specify the Connection Reaction Time Limit and Requested Packet
Interval
On the SIL 2 Safety tab of the module, enter the requested packet interval (RPI)
and connection reaction time limit (CRTL). The module RPI is the same as the
setting on the Connection tab.
IMPORTANT
See Electronic Keying on page 118.
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