Possibly the shortest program in the world

BachPhi · Nov 4, 2016

I came across this program, very short! lol.

PLCMentor · Nov 4, 2016

Did hard-wiring completely go out of style?

Brian123 · Nov 4, 2016

Eh, it's 50% longer than it needs to be. You only really need the timer contact on the second rung...

Edit: I'm also not seeing how that is an effective anti-tiedown program..

g.mccormick · Nov 4, 2016

Brian123 said:
Eh, it's 50% longer than it needs to be. You only really need the timer contact on the second rung...

Agree. Look at that wasted code! Someone should be ashamed!

kamenges · Nov 4, 2016

Never mind that it doesn't accomplish what it appears to be trying to accomplish, that being anti-tiedown. It is pretty short, though. Not as short as it could be but pretty short nonetheless.

Keith

g.mccormick · Nov 4, 2016

kamenges said:
Never mind that it doesn't accomplish what it appears to be trying to accomplish, that being anti-tiedown. It is pretty short, though. Not as short as it could be but pretty short nonetheless.

Keith

What are they trying to accomplish? What is meant by "anti-tiedown"?

Mickey · Nov 4, 2016

g.mccormick said:
What are they trying to accomplish? What is meant by "anti-tiedown"?

Safety,to keep your fingers and hands from being chopped off.

https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwi5v9j-lZDQAhXLi1QKHWNRDiIQFggwMAA&url=http%3A%2F%2Fwww.michigan.gov%2Fdocuments%2Fdleg%2Ftwohand_292567_7.pdf&usg=AFQjCNFtFgqppt-ZWKjjJottsh0-EaE5XQ

JesperMP · Nov 4, 2016

If this is really a safety function to prevent someone from getting the fingers chopped off, then everyone incl. Bachphi failed to notice the real issue.
Two-hand control must never be made with a regular PLC.

osmanmom · Nov 5, 2016

http://www.machinesafetyspecialists.com/two hand control basics (us).aspx

http://literature.rockwellautomation.com/idc/groups/literature/documents/at/safety-at071_-en-e.pdf

http://literature.rockwellautomation.com/idc/groups/literature/documents/in/minotr-in005_-en-p.pdf

BachPhi · Nov 5, 2016

I said "I came across" , I dont even know if and where it located. It's funny that someone built a PLC with two rungs program. But you brought up a good point about safety.

GaryS · Nov 5, 2016

it may be a short program but it don not do what the want it would work the same with just the 2 buttons then the output in 1 rung timer is unnecessary

Aabeck · Nov 5, 2016

Did you go to IO Config and see what the PLC setup was?

Like a SLC5/5 in a 10 slot rack?

A 32pt Input?

sparkyinak · Nov 5, 2016

Shortest program in the world:

----------(R1)--

g.mccormick · Nov 5, 2016

Actually wouldn't the shortest be

-----------[ END ]

BachPhi · Nov 5, 2016

Aabeck, very funny! I will look on Monday, but I'' bet that it's a micrologix, probably built by some electrician ( no pun intended :=).

Sparky, yours dont look real, so it does not count.

For the sake of anti tie down, obviously it does not do anti tie-down like his/her intention to.

For the sake of safety discussion, It would be wise to use hardware safety relays for the purpose of safety. At the heart of the safety relays are dual channel inputs , and in the case of ATD, it would have the electronic inside to monitor for a standard time max of 500 ms and the double/redundant contacts to power the real outputs.

Possibly the shortest program in the world

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