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Thermal Overload
The threads that wouldn't die...
- PC reliability?
- Windows, real time
- PID loops
- PCs vs. PLCs
- Replacing people
- MS 'monopoly'?
- Software quality
- Where do we go from here?
- Why pay?
- PC reliability?
- Windows, real time
- PID loops
- PCs vs. PLCs
- Replacing people
- MS 'monopoly'?
- Software quality
- Where do we go from here?
- Why pay?
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from the Instrument department...
PLC Scan Time
Is there any limit imposed by TUV on scan time? We have a SIL-3 certified system that can go up to 450mS scan time. However, project specification restricts it up to 300mS.
I would like to know whether any guidlines are available from TUV for SIL 3 certified systems.
I would like to know whether any guidlines are available from TUV for SIL 3 certified systems.
Yes TUV requirement is 300ms for process and 500ms for fire and gas.
I dont think you will need more scantime for your RUNG. Normally process RUNG are shorter compared to F&G.
more information http://www.intro4u2u.com/category/technology/ipf/
I dont think you will need more scantime for your RUNG. Normally process RUNG are shorter compared to F&G.
more information http://www.intro4u2u.com/category/technology/ipf/
From Control Engineering magazine...
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Above articles copyright 2008 Reed Business Information.
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