12 Rockwell Automation Publication 1756-UM013B-EN-P - October 2019
Chapter 1 Digital Safety I/O Module Operation in a Control System
Overall System Safety
Function
The following 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
Determine Conformity
IMPORTANT Functional safety certification and performance of 1756-IB16S and
1756-OBV8S modules requires that the modules operate in conditions at or
below the ambient operating temperature specification.
The probability of a dangerous 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, see the 1756 ControlLogix I/O Specifications Technical Data,
publication 1756-TD002.
IMPORTANT Requirements are based on the standards current at the time of certification.
For more information on safety application suitability levels:
• 1756-IB16S Input Module Features on page 45
• 1756-OBV8S Output Module Features on page 57
ATTENTION: Use only appropriate components or devices that comply with
the relevant safety standards and meet the required safety integrity level or
Performance Level and safety category.
• Conformity to the requirements of the relevant safety standards must be
determined for the entire system by conducting a risk assessment.
• Use devices properly according to the installation environment,
performance rating, and functions of the machine.
• Use devices within their specified ratings.
• We recommend that you consult a certification body regarding assessment
of conformity to the required safety integrity level or Performance Level.
You are responsible for confirming compliance with the applicable standards for
the entire system. You must read, understand, and fulfill the functional safety
requirements of the standard applicable to your safety application.
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