Machinery Safety 101

Q & A: Category 2 and Testing Intervals

Logical block diagram for ISO 13849-1 Category 2 architecture.
This entry is part 1 of 2 in the series Q&A

Dur­ing the Free Safety Talks that we did with Schmersal Canada and Frank­lin Empire, we had a “hot ques­tion” come up regard­ing Cat­egory 2 archi­tec­ture and the test­ing inter­val require­ment. The defin­i­tion of Cat­egory 2 in 6.2.5 does not include any men­tion of a min­im­um test­ing rate, but 4.5.4 “Sim­pli­fied pro­ced­ure for estim­at­ing the quan­ti­fi­able aspects of PL”…

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Q & A: Can Safety PLCs be used for Lockout?

Disconnect Switch with Lock and Tag
This entry is part 2 of 2 in the series Q&A

The ques­tion of lock­out and the use of safety PLCs as a means to meet the lock­out require­ments comes up more and more fre­quently these days. Can Safety PLCs be used for lock­out? Safety pro­fes­sion­als don’t always agree on this con­tro­ver­sial top­ic! Dur­ing the Free Safety Talks that we did with Schmersal Canada and Frank­lin Empire, this…

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