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Rockwell Automation Publication 1756-RM100F-EN-P - October 2018 83
Chapter
4
Replacement Considerations with Safety
Applications
This chapter describes features and functions that are associated with the
GuardLogix® 5580 and Compact GuardLogix 5380 controllers, and the
differences in safety functionality from previous safety controllers.
Perform Risk Assessment
A proper safety strategy consists of risk assessment and risk reduction.
• Risk Assessment – understand the machine limits and functions and
tasks that may be required to be performed at the machine throughout
its life.
• Risk Reduction – performed if necessary and safety measures are
selected based on the information derived from the risk assessment
stage. The manner in which this is done is the basis of the Safety Strategy
for the Machine.
Safety Standard IEC-61508 Part-1, Section 7.16 (Overall modification and
retrofit) states as follows:
7.16.2.3.- An impact analysis shall be carried out that shall include an
assessment of the impact of the proposed modification or retrofit
activity on the functional safety of any E/E/PE safety-related system.
The assessment shall include a hazard and risk analysis sufficient to
determine the breadth and depth to which subsequent overall, E/E/PE
system or software safety lifecycle phases will need to be undertaken.
The assessment shall also consider the impact of other concurrent
modification or retrofit activities, and shall also consider the functional
safety both during and after the modification and retrofit activities have
taken place.
See the Machinery Safebook 5 - Safety related control systems for machinery
Reference Manual, publication
SAFEBK-RM002C-EN-P .
Topic Page
Perform Risk Assessment 83
Applications with 1734-AENTR Series A Modules 84
Safety Signature 84
Safety Network Number 86
Produce/Consume Safety Tags 87
Safety Application Conversion 88
Replace Producer Controller 94