Rockwell Automation Publication 440R-RM003A-EN-P - July 2021 7
Chapter 1
Introduction
Product Overview The next generation Guardmaster® safety relay (GSR) family is a high-quality
replacement for most of the Minotaur™ safety relay (MSR) family.
The consistent 22.5 mm (0.9 in.) wide housing design and configurable
functions for reset and logic of GSR modules let you consolidate various
functions of MSR modules with fewer relays. These features help you reduce
your stocking requirements.
The MSR family of safety relays typically offers one dedicated safety function
for each safety circuit and actuator. MSR solutions have less connectivity to
each other than GSR modules. If you add safety circuits, those circuits require
additional safety relay modules and safety contacts for cascading to the
maintain PLd or PLe safety ratings according to EN ISO 13849-1 or SIL 2 or SIL
3 according to IEC 62061.
The GSR family of safety relays offers configurable safety functions and
consolidated safety circuits, which result in fewer units, less space, and less
cost. Due to the unique capability to cascade single-wire safety (SWS), logic
combinations and zones are constructed quickly.
A replacement with GSR modules is meant to be more than just a swap out.
New Machinery Directives have changed the designs of machines over the
years. These changes have harmonized standards and demands of safety
solutions that contribute to productivity and flexibility.
This publication offers detailed information to help with your conversion from
the legacy MSR family to a smarter and cost-effective design of machine in
compliance with the latest requirements of Machinery Directive and
harmonized standards.
For further assistance in replacing those devices, contact Rockwell Automation
support, your local Allen-Bradley distributor, or Rockwell Automation sales
office.
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