Safety relays expand application versatility, improve selection, streamline system design

Compact size and enhanced functionality of Allen-Bradley Guardmaster safety relays from Rockwell Automation help reduce wiring and installation costs, simplifies inventory management.


Machine builders and end-users seeking to simplify safety relay selection and reduce component inventory and lifecycle costs will benefit from the new family of Allen-Bradley Guardmaster safety relays from Rockwell Automation. Designed to meet new global functional safety standards, such as EN ISO 13849-1, the new line of safety relays includes seven basic units capable of supporting a broad range of safety devices in a variety of applications, including single and multi-zone configurations.

“With the wide range of safety relay options available to today’s designers, selecting the right one to meet the specific demands of each application – and applicable standards – can pose a significant challenge,” said Camilo Aladro, global product manager of safety relays, Rockwell Automation. “The new Guardmaster family of safety relays helps simplify this task by delivering the functionality and flexibility for meeting most application and compliance demands, while reducing panel space requirements, eliminating hardware and simplifying installation and maintenance.

The new relay line features a patented, single-wire communication capability that helps eliminate the need for dual-channel connection between relays. Users can expand and cascade safety functions up to a SIL 3 rating using one single wire to connect devices allowing for a reduction in installation time and effort.  In addition, “AND/OR” logic can be set via a rotary switch on the front of the relay, yielding a variety of configurations including regional and global e-stop architectures.

A universal input feature allows devices, such as safety interlock switches, emergency stop switches and safety mats, to use the same set of input terminals on the relay. This helps eliminate the need to employ a specific safety relay for a specific type of input device, helping simplify system design and reduce hardware costs.     

The next generation Guardmaster safety line also features dual input modules, providing users with twice the functionality of a standard relay in a 22.5-mm housing while reducing wiring for faster commissioning. A single TÜV-approved rotary switch with internal redundancy eliminates the need for double switches, helping to speed configuration while addressing multiple functions, such as reset modes and time delays.

For more information on the Allen-Bradley Guardmaster line of safety relays, visit

Rockwell Automation

- Also see:

Control Engineering: Machine safety blog

Control Engineering: Plant safety and security channel

Safety Automation Forum – Protecting People, Productivity and Planet – November 2, 2010

Improving Manufacturing Performance through Intelligent Safety System Design

- Edited by Amanda McLeman, Control Engineering, CFE Media,

No comments
The Top Plant program honors outstanding manufacturing facilities in North America. View the 2013 Top Plant.
The Product of the Year program recognizes products newly released in the manufacturing industries.
The Engineering Leaders Under 40 program identifies and gives recognition to young engineers who...
Sister act: Building on their father's legacy, a new generation moves Bales Metal Surface Solutions forward; Meet the 2015 Engineering Leaders Under 40
2015 Mid-Year Report: Manufacturing's newest tool: In a digital age, digits will play a key role in the plant of the future; Ethernet certification; Mitigate harmonics; World class maintenance
2015 Lubrication Guide: Green and gold in lubrication: Environmentally friendly fluids and sealing systems offer a new perspective
Drilling for Big Data: Managing the flow of information; Big data drilldown series: Challenge and opportunity; OT to IT: Creating a circle of improvement; Industry loses best workers, again
Pipeline vulnerabilities? Securing hydrocarbon transit; Predictive analytics hit the mainstream; Dirty pipelines decrease flow, production—pig your line; Ensuring pipeline physical and cyber security
Cyber security attack: The threat is real; Hacking O&G control systems: Understanding the cyber risk; The active cyber defense cycle
Designing positive-energy buildings; Ensuring power quality; Complying with NFPA 110; Minimizing arc flash hazards
Building high availability into industrial computers; Of key metrics and myth busting; The truth about five common VFD myths
New industrial buildings: Greener, cleaner, leaner; New building designs for industry; Take a new look at absorption cooling; Offshored jobs start to come back

Annual Salary Survey

After almost a decade of uncertainty, the confidence of plant floor managers is soaring. Even with a number of challenges and while implementing new technologies, there is a renewed sense of optimism among plant managers about their business and their future.

The respondents to the 2014 Plant Engineering Salary Survey come from throughout the U.S. and serve a variety of industries, but they are uniform in their optimism about manufacturing. This year’s survey found 79% consider manufacturing a secure career. That’s up from 75% in 2013 and significantly higher than the 63% figure when Plant Engineering first started asking that question a decade ago.

Read more: 2014 Salary Survey: Confidence rises amid the challenges

Maintenance and reliability tips and best practices from the maintenance and reliability coaches at Allied Reliability Group.
The One Voice for Manufacturing blog reports on federal public policy issues impacting the manufacturing sector. One Voice is a joint effort by the National Tooling and Machining...
The Society for Maintenance and Reliability Professionals an organization devoted...
Join this ongoing discussion of machine guarding topics, including solutions assessments, regulatory compliance, gap analysis...
IMS Research, recently acquired by IHS Inc., is a leading independent supplier of market research and consultancy to the global electronics industry.
Maintenance is not optional in manufacturing. It’s a profit center, driving productivity and uptime while reducing overall repair costs.
The Lachance on CMMS blog is about current maintenance topics. Blogger Paul Lachance is president and chief technology officer for Smartware Group.