Rockwell Automation 1715-OF8I Redundant I/O System User Manual - Manual (Page 223)

Rockwell Automation Publication 1715-UM001C-EN-P - March 2014 223
Chapter
7
Using SIL 2 Add-On Instructions with 1715
Redundant I/O Modules
SIL 2 Add-On Instructions
Overview
Topic Page
SIL 2 Add-On Instructions Overview 223
SIL 2 Check Data 227
Add-On Instruction Inputs 227
Add-On Instruction Outputs 228
Download and Import the Add-On Instructions 229
Configure an Input Module Add-On Instruction 234
Configure an Output Module Add-On Instruction 238
Using the Add-On Instruction Data Tags in an Application Program 242
Performing a SIL 2 Reset 243
IMPORTANT To achieve SIL 2 with 1715 I/O modules in a ControlLogix system, you must use
these Add-On Instructions. The SIL 2 Add-On Instructions verify the validity of
data transferred between the ControlLogix controller and the 1715 modules via
the 1715-AENTR adapter. See
Download and Import the Add-On Instructions
on page 229 .
IMPORTANT As you proceed with this chapter, be aware that when using the 1715 SIL 2
Add-On Instructions, you should not read inputs directly from the input table,
nor should you write directly to the output tags. You will read inputs from an
Add-On Instruction tag called ‘reconciled input data,’ and write outputs to an
Add-On Instruction tag called ‘requested output data.’
IMPORTANT There is an Add-On Instruction required for the 1715-AENTR, as well. The status
data from the 1715-AENTR must be validated by using this Add-On Instruction.
IMPORTANT You cannot view the logic of each Add-On Instruction because they are source
protected.