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Monday, December 18, 2017
The Automation Safety Community Forum.
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The discussions that wouldn't end...
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Basic difference between Zone-2 and Zone-1 equipment
Posted by A.K.Hait on 12 July, 2007 - 10:42 pm
Exd/Exe equipment for Zone-2 and Zone-1
31
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Wiring Up 7 Emergency Stops on a Conveyor
Posted by GregR on 22 March, 2017 - 11:57 pm
Looking for a diagram for wiring emergency stops on a conveyor.
23
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Automation Market - Real Numbers
Posted by Luis Andes Navia on 11 April, 2001 - 6:38 am
My name is Luis Andes, I am developing a project "Present and future of the automation market"
17
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safe?
Posted by Raymond on 22 August, 2002 - 2:02 pm
A light curtain is tied into a PLC input only. Who can tell me that Will this meet safety codes?
16
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programming a Two Hand Tie Down
Posted by Anibal Hernandez on 23 January, 2001 - 3:41 pm
programming a Two Hand Tie Down
10
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Safety risk assessment
Posted by Tom Bullock on 5 February, 2013 - 11:20 am
Safety risk assessment report
10
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Safe Torque Off?
Posted by Curt Wuollet on 19 September, 2013 - 2:30 pm
Can this replace a hard all energy removed E-Stop?
10
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IS Barrier Use
Posted by bbsreyes on 1 July, 2016 - 11:05 pm
Are IS Barriers Required for Instrumentation Rated Class II?
9
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Light curtain questions
Posted by Ron Gage on 18 December, 2000 - 4:15 pm
Is there a recent standards change for light curtains?
8
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Safety wiring on manually loaded press station
Posted by Lanco Guy on 11 November, 2011 - 1:40 pm
Looking to see what industry standard is for muting a light curtain. We do not want to drop air every time the curtain is broken.
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Can a standard PLC be used for safety inputs?
Posted by Mark A. Dill on 24 October, 2005 - 11:34 pm
In the past... we have used two hand anti-tie down palm button logic in the programming of standard PLCs... we are now questioning the validity of that practice.
8
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EOL Resistors
Posted by Punnoose Jacob on 26 August, 2002 - 3:04 pm
I would like to know why an End of Line (EOL) resistor is used...
8
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Why can't fieldbus be used for safety?
Posted by Lorenzo Cecchini on 3 April, 2007 - 10:07 pm
Questions about fieldbus...
8
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PLC in Class 1 Div 2, cooling options
Posted by I&CAdvisor on 1 August, 2013 - 4:44 pm
are cooling options available for panels in Class 1 Div 2 areas?
8
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Liability?
Posted by Clay Robbins on 3 July, 2014 - 11:54 am
Am I personally liable if I build a machine without safety features to prevent an operator from getting hurt?
7
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Emergency Stop
Posted by pandu on 15 September, 2012 - 4:06 am
Where does Emergency stop action go?
7
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Lossy NC Contact Blocks on Pushbuttons
Posted by runescape on 22 January, 2015 - 4:54 pm
Should I replace Estop buttons that are not reading 0 ohms Normally Closed?
7
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Entering Electrical Panels -Industrial Environment
Posted by bowilly on 14 February, 2015 - 8:50 am
To enter a panel, must the panel be de-energized or do I need the "Michelin Man" suit?
7
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Placing a Motor in an Explosion Proof / Intrinsically Safe Location
Posted by PaulKraemer1 on 6 December, 2016 - 10:17 am
What are the physical/electrical barrier requirements if I want to locate a motor in a hazardous location with its associated drive outside of the hazardous location?
6
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IS barriers Vs. Hard wired safety circuit
Posted by Tom D. on 17 October, 2003 - 11:58 am
Implement hard wired circuit through IS barriers to a safety relay??
6
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Telemecanique Safety Relay, XPS-AT
Posted by Tim J on 18 March, 2002 - 3:28 pm
Noise? or What to look for?
6
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3 wire gas detector interface to PLC systems
Posted by Vadhooth on 28 April, 2004 - 12:56 am
Want to connect 3 wire flammable gas detector to a safety system.
6
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NEMA 7 cabinet purge: air or nitrogen?
Posted by FingerLaker on 23 August, 2012 - 9:22 am
How to choose air or nitrogen for a purge system
6
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Moving Estop Wiring
Posted by Nate B on 13 November, 2014 - 10:00 am
Can I fire an Estop remotely?
6
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Ex'd' Certified Transmitter in Ex'i' loop
Posted by sachinrk on 16 September, 2015 - 7:15 am
What should be the loop electrical certification when an Ex'd' Certified transmitter is connected to an intrinsically safe loop/barrier of PLC/DCS?
6
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Intrinsic Safe & Non-intrinsic Safety Cables
Posted by sakthivenkatesh on 12 January, 2016 - 3:27 am
Differences between intrinsic Safe & Non-intrinsic safety Cables
6
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Instrument Grounding
Posted by jouellet on 2 February, 2016 - 5:23 pm
Instrument grounding: arguments needed...
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does Ex d Ib need IS barrier?
Posted by MarionM on 22 September, 2016 - 4:16 am
does Ex d Ib instrument need IS barrier?
5
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Why Safety Relay??
Posted by pandu on 12 June, 2012 - 5:56 am
what is the purpose of Safety Relay?
5
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Control Systems Safety Relays????
Posted by Anonymous on 18 February, 2003 - 5:28 pm
Can anyone elaborate on the requirements of Category 3 (ISO 13849-1/EN 954-1)?
5
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Safety for a dial table indexer?
Posted by Escabara on 3 November, 2012 - 7:37 pm
A simple problem, but I'm not even sure where to begin. A dial table with operator interaction, and not sure what parts must be protected by an e-stop.
5
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Intrinsically safe barrier required?
Posted by Jordan on 21 February, 2013 - 6:22 pm
When are IS barriers required?
5
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IS Smoke Detector without IS Barrier
Posted by Etherhat on 4 February, 2015 - 3:32 pm
Intrinsically safe (IS) smoke detectors installed in a non hazardous area without an IS barrier.
5
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FIELDBUS for Safety Instrumented System?
Posted by Kenno on 23 February, 2015 - 10:53 am
Looking for information about a special version of FF designed for the use in safety instrumented systems.
5
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E-Stop Regulation: Hardwired vs. PLC Controlled
Posted by Wade on 15 January, 2016 - 6:38 am
Is there a law or regulation that clearly states that you are not allowed to use a PLC to execute a E-stop procedure?
5
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Intrinsically Safe
Posted by solmaz on 6 June, 2017 - 4:12 am
Using a intrinsically safe positioner in non-hazard area
4
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Safety -- Control Reliable
Posted by Adrian on 5 July, 2002 - 11:18 am
How far can Redundancy go?
4
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Leuze Lumiflex Light curtain
Posted by Martin Roberts on 5 October, 2003 - 4:57 pm
We are having problems with a Leuze lumiflex light curtain intermittent tripping...
4
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Width measurement sensor
Posted by Anonymous on 15 September, 2006 - 11:09 pm
How to measure the width of a material.
4
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Recommended way to EStop (Disconnect?) Servo Motor
Posted by Peter Elliot on 6 May, 2002 - 2:47 pm
I'd like to know what the recommended way to perfrom an EStop for a servo motor driven actuator mounted on a robot.