Industrial Safety

Safety PLCs: Reducing risk at your plant

Get the right solutions and tools to improve safety.

By Hank Hogan

Achieving safety isn't a risky business — if you have the right solutions and tools. That's where safety PLCs come in, as these systems can make factory floors less dangerous to people, product, the environment and other machines. But to get the most out of the technology, it helps to know the basics.

It comes down to understanding and reducing risk.

For instance, a safety PLC differs from its standard cousins in a few important respects, says John D'Silva, safety technology manager at Siemens Industry. One involves communication. For instance, Profisafe, a safe protocol layer that runs atop industrial Ethernet, has consecutive numbering of messages, time expectation with acknowledgement, a unique codename between sender and receiver, and cyclic redundancy data-integrity checks.

Read the whole story on Control Design

Free Subscriptions

Plant Services Digital Edition

Access the entire print issue on-line and be notified each month via e-mail when your new issue is ready for you. Subscribe Today.

plantservices.com E-Newsletters

Get Plant Services delivered to your inbox Monday through Friday! Sign up for Plant Services' complimentary Smart Minute e-newsletter to get maintenance and reliability know-how you can put to use today, plus the latest manufacturing news from around the Web, special reports, and more. Learn more and subscribe for free today.