Rockwell Automation Publication 1715-RM001A-EN-P - June 2019
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Using 1715 Hardware in a ControlLogix SIL 2 System
Chapter 4
The SIL 2 Add-On Instructions are available from the Product Compatibility
and Download Center website.
As you proceed, be aware that when using the 1715 SIL 2 Add-On Instructions,
you do not read inputs directly from the input table, nor do you write directly to
the output tags. You read inputs from an Add-On Instruction tag that is called
‘reconciled input data’, and write outputs to an Add-On Instruction tag called
‘requested output data.’
Figure 9 - Module Data Flow
IMPORTANT
You see the following warning for each Add-On Instruction import except the
first one. Each Add-On Instruction import overwrites the CRC Calculator Add-On
Instruction.Click OK to continue.
