Rockwell Automation 5094-OB32XT - Single-Channel or Dual-Channel Mode

Rockwell Automation Publication 5094-UM001E-EN-P - April 2020 37
Digital I/O Module Operation in a Logix 5000 Control System Chapter 1
These restrictions apply to the modules:
• Type-approved and certified for use in safety applications up to and
including SIL 3 per IEC 61508
• Suitable for use in safety applications up to and including SIL CL 3 per
IEC 62061
• Suitable for use in safety applications up to and including Performance
Level e (PLe), category 4 per ISO 13849-1
Single-channel or Dual-channel Mode
You can use FLEX 5000 safety I/O modules in single-channel mode or dual-
channel configuration. The configuration affects the safety application suitability
level for a module.
In single-channel mode, the signal status on one channel is evaluated. Based on
that status, safety input data and safety input status can be off or on.
In dual-channel mode, the consistency between the signal status on two channels
is evaluated. Based on the status on both channels, safety input data and safety
input status can be off or on.
You use safety instructions in the safety controller ladder logic with two single
channels, that is, one even and one odd.
IMPORTANT Functional safety certification and performance of FLEX 5000 I/O safety
modules requires that the modules operate in conditions at or below the
ambient operating temperature specification.
The Probability of Failure on Demand (PFD) and average frequency of a
dangerous failure per hour (PFH) calculations for these modules are based
on the module operating conditions adhering to the ambient operating
temperature specification.
For more information on the maximum ambient operating temperature
specification for FLEX 5000 I/O safety modules, see the FLEX 5000 Modules
Specifications Technical Data, publication 5094-TD001
.
IMPORTANT Requirements are based on the ISO standards that are current at the time
of certification.
For more information on safety application suitability levels with the
FLEX 5000 safety I/O modules, see the following:
• 5094-IB16S - Safety Input Module Features on page 69
• 5094-OB16S - Safety Output Module Features on page 77
• 5094-OW4IS - Safety Relay Output Module Features on page 84