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Search: Posts Made By: mk42
Forum: LIVE PLC Questions And Answers December 18th, 2017, 02:28 PM
Replies: 50
Views: 3,082
Posted By mk42
Well said

Well said
Forum: LIVE PLC Questions And Answers December 18th, 2017, 07:54 AM
Replies: 50
Views: 3,082
Posted By mk42
1) See my other post discussing the fact that...

1) See my other post discussing the fact that Machine safety and Process safety are not the same thing.

2) The safety system should not be able to be compromised by the original need for the...
Forum: LIVE PLC Questions And Answers December 18th, 2017, 07:39 AM
Replies: 50
Views: 3,082
Posted By mk42
Quick collection of recent references in this...

Quick collection of recent references in this thread:







Here's the thing: If you look at each of those links/standards, they very clearly apply to safety of MACHINERY. Those links, and...
Forum: LIVE PLC Questions And Answers December 17th, 2017, 08:51 AM
Replies: 50
Views: 3,082
Posted By mk42
An E Stop is to put the system to a safe state....

An E Stop is to put the system to a safe state. It is intended to be used even by the uninformed/untrained, yes, but that doesn't mean that it can't be designed to do complex/intelligent things.
...
Forum: LIVE PLC Questions And Answers December 15th, 2017, 03:41 PM
Replies: 50
Views: 3,082
Posted By mk42
The first thing you need to identify is what...

The first thing you need to identify is what safety standard(s) you're trying to follow. From there you can start your risk assessment.

To be clear: I'm not aware of any situation in which a...
Forum: LIVE PLC Questions And Answers December 15th, 2017, 02:10 PM
Replies: 50
Views: 3,082
Posted By mk42
I have heard of HMIs with Estop pushbuttons built...

I have heard of HMIs with Estop pushbuttons built in. I've even heard of a SCADA system that billed itself as SIL2, although I have no idea what the application was. I haven't seen any machine HMIs...
Forum: LIVE PLC Questions And Answers December 15th, 2017, 10:17 AM
Replies: 50
Views: 3,082
Posted By mk42
Siemens has an instruction for the HMI...

Siemens has an instruction for the HMI interacting with the safety program (2 step process with confirmation), so hypothetically safety on the HMI isn't impossible.

That said, a button on the HMI...
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