Rockwell Automation 1794 FLEX I/O System with ControlLogix for SIL2 - Manual (Page 23)

1 Publication 1794-RM001G-EN-P - December 2011
Chapter
3
FLEX I/O Modules
This chapter discusses the FLEX I/O modules that are SIL2 certified.
Overview of FLEX I/O
Modules In the most basic description, there are two types of SIL2-certified FLEX I/O
modules:
• Digital I/O modules
• Analog I/O modules
With each type, however, there are differences between specific modules.
Because the differences propagate to varying levels in each module type, a
graphical representation can best provide an overview of the many
SIL2-certified FLEX I/O modules.
FLEX I/O modules are designed with inherent features that assist them in
complying with the requirements of the 61508 Standard. For example, the
modules all have a common backplane interface, execute power-up and
runtime diagnostics, and offer electronic keying.
Table 1.1 lists the FLEX I/O modules initially submitted for SIL2
certification.
For information about: See page:
Overview of FLEX I/O Modules 3-1
Using Digital Input Modules 3-2
Wiring FLEX I/O Digital Input Modules 3-3
General Considerations when using Any FLEX
I/O Digital Output Module 3-4
Wiring FLEX I/O Digital Output Modules 3-5
Using Analog Input Modules 3-7
Wiring FLEX I/O Analog Input Modules 3-9
Checklist for SIL Inputs 3-18
Checklist for SIL Outputs 3-19