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3 January, 2017

ISO 13849 – 1 Analysis — Part 1: Start with Risk Assessment

by Doug Nix

in Canada, CE Mark, Complementary Protective Measures, Control Functions, Control Reliability, Emergency Stop, EU European Union, Functional Safety, Guards and Guarding, Hierarchy of Controls, How to, Interlocks, Interlocks, International, ISO 13849, Risk Assessment /

6 Comments

This entry is part 1 of 9 in the series How to do a 13849 – 1 analysis

This post was updated 2019-07-24 I often get questions from clients about how to get started on Functional Safety using ISO 13849. This article is the first in a series that will…

27 April, 2015

Testing Emergency Stop Systems

by Doug Nix

in Canada, CE Mark, Control Functions, Control Reliability, Emergency Stop, EU European Union, Functional Safety, Interlocks, International, ISO 13849, Uncategorized /

5 Comments

This entry is part 11 of 16 in the series Emergency Stop

Updated 2020-10-31. DN I’ve had a number of questions from readers regarding testing of emergency stop systems, and particularly with the frequency of testing. I addressed the types of tests that might…

27 January, 2014

CSA Z432 Safeguarding of Machinery – 3^rd Edition

by Doug Nix

in Canada, Control Functions, Control Reliability, Emergency Stop, Functional Safety, Guards and Guarding, Hazards, Hierarchy of Controls, Interlocks, Risk Assessment, Standards

If you build machinery for the Canadian market, or if you modify equipment in Canadian workplaces, you will be familiar with CSA Z432, Safeguarding of Machinery. This standard has been…

4 December, 2013

Emergency stop devices: the risks of installer liability

by Doug Nix

in CE Mark, Emergency Stop, EU European Union, Functional Safety

This entry is part 10 of 16 in the series Emergency Stop

On the MachineBuilding.net blog today, Alex D’Arcy, Sales Director at Hylec-APL provides some interesting insights into the liabilities associated with the installation of emergency stop devices on machinery. Hylec-APL provides technical…

26 September, 2011

Interlock Architectures – Pt. 5: Category 4 – Control Reliable

by Doug Nix

in Control Functions, Control Reliability, Emergency Stop, Functional Safety, Guards and Guarding, Interlocks /

2 Comments

This entry is part 5 of 8 in the series Circuit Architectures Explored

Ed. note: I’ve made a few updates to this article since it was first published in 2011, with the most recent on 2020-05-11. – DN – The most reliable of the five…

19 September, 2011

Interlock Architectures – Pt. 4: Category 3 – Control Reliable

by Doug Nix

in Control Functions, Control Reliability, Emergency Stop, Functional Safety, Guards and Guarding, Interlocks, Interlocks, International, ISO 13849, Robotics

Category 3 Architecture Logic Block Diagram

This entry is part 4 of 8 in the series Circuit Architectures Explored

This post was updated on 2020-03-28. Category 3 system architecture is the first category that could be considered to have similarity to “Control Reliable” circuits or systems as was defined in…

31 March, 2011

New contact block design for Emergency Stop devices from Siemens

by Doug Nix

in Emergency Stop, Products /

12 Comments

This entry is part 9 of 16 in the series Emergency Stop

One issue that frequently comes up when inspecting machinery is the contact blocks used on emergency stop devices. Until now, e‑stop devices were normally fitted with the same contact blocks…

15 March, 2011

Updates to Popular Articles

by Doug Nix

in Canada, CE Mark, Control Functions, Emergency Stop, Hazardous Energy Control Procedures, Robotics, USA

This entry is part 8 of 16 in the series Emergency Stop

We’ve recently updated a couple of our popular articles! Check them out! Busting Emergency Stop Myths Reader Question: Multiple E‑Stops and Resets

1 March, 2011

Reader Question: Multiple E‑Stops and Resets

by Doug Nix

in Canada, CE Mark, Emergency Stop, EU European Union, USA /

6 Comments

This entry is part 7 of 16 in the series Emergency Stop

I had an interesting question come in from a reader today that is relevant to many situations: “When you have multiple E‑Stop buttons I have often gotten into an argument that says…

28 February, 2011

Understanding the Hierarchy of Controls

by Doug Nix

in Canada, CE Mark, Complementary Protective Measures, Control Functions, Control Reliability, Emergency Stop, EU European Union, Functional Safety, General, Guards and Guarding, Hazardous Energy Control Procedures, Hierarchy of Controls, Interlocks, Interlocks, Lockout, Ontario, Risk Assessment, Robotics, USA /

8 Comments

The Hierarchy of Controls illustrated as an inverted triangle with each level of the hierarchy written one above the other, starting with Inherently Sfe design, then Engineering Controls, then Information for Use, then Administrative Controls and finally descending to PPE at the bottom. An arrow with the text "Effectiveness" on it runs parallel to the triangle and points downward from Inherently safe design to PPE.

This entry is part 4 of 5 in the series Hierarchy of Controls

(Eds. note: This article was originally written in 2011 and was updated in Nov. 2018.) The “Hierarchy of Controls” is one approach to risk reduction that has become entrenched in the…

File	DLs
A User’s Guide to Conveyor Belt Safety—Protection from Danger Zones	16018
OMRON Proper Installation of Rope or Wire Pull Emergency Stop Devices	5500
Rockwell Automation: Palletizer Functional Safety with relay and configurable relay solution.	4252
Safe Speed & Standstill Monitoring	3315
Study of Machine Safety for Reduced-Speed or Reduced-Force Work	2976