Studio 5000 Power Up OTE vs OTL OTU of a Controllogix Compactlogix

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We are going show you some very important differences between to OTE Output Energize instruction and the OTL/OTU latch unlatch instructions that happen when power is cycled to the PLC.
An OTE output energize will be off on power up where as the OTL/OTU will remain in it’s last state on power up.
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Опубликовано:

8 сен 2024

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Комментарии : 38

@brstilson 3 года назад

I've been programming over 15 years and I never knew this! It never really came up for me before so I never thought about it. There really is always more to learn no matter how long you've done this.

@TimWilborne 3 года назад

Yes, this one shocks a lot of people.

@techtopics5782 Год назад

That help file was definitely not clear... This was what I was looking for.

@TimWilborne Год назад

Glad to hear it!

@marshal7102 6 месяцев назад

Thanks a lot Tim this is just what I needed to know. Your the Best!!!

@TimWilborne 6 месяцев назад

Happy to help!

@nisrnisr5980 3 года назад

thanks Tim

@TimWilborne 3 года назад

You are welcome!

@marshal7102 6 месяцев назад

Im building an elevator system in my home and it uses multiple inputs and outputs for limit switches, door sensors and obstacle detection

@TimWilborne 6 месяцев назад

Neat project!

@johnrece6622 3 года назад

That answered my question, thank you sir!

@TimWilborne 3 года назад

Glad to help John!

@jerrywyatt8200 2 года назад

Always something to learn. I'm finishing up a project and was concerned about my latched outputs when my emulator powered the dang things on at startup. I did use the S:FS to unlatch before watching this video, but now I know the how, and the why. Thanks Tim!

@TimWilborne 2 года назад

You are welcome!

@nassimlamrous3721 Год назад

I can't find the first scan bit in my controller

@TimWilborne Год назад

Just type it, it is hidden

@nassimlamrous3721 Год назад

@@TimWilborne thanks Tim

@TimWilborne Год назад

You are welcome

@nassimlamrous3721 Год назад

@@TimWilborne Hi Tim, when i add S,FS in the program the plc doesn't recognize it do i have to add it as a new tag ?

@TimWilborne Год назад

@@nassimlamrous3721 It is S:FS, it is a colon in between, not a comma.

@jonnymac31 3 года назад

Hell yeah man. I appreciate the wise words.

@TimWilborne 3 года назад

Glad to help John.

@matthewfisher9352 3 года назад

Why not use NOHC or NCHO to eliminate your the pre and post scan variables?

@TimWilborne 3 года назад

Hi Matthew, I'm aware of these electrical terms but not instructions, can you elaborate?

@marshal7102 6 месяцев назад

Ok Tim, I tried the example with the S:FS instruction on my (U) rung but have multiple inputs via branching. When I added the S:FS branch it did not show First scan when hovering the mouse pointer but I got an error Invalid Direct File Offset?? Can this be used on multiple branches on a (U) rung??

@TimWilborne 6 месяцев назад

What PLC are you using?

@marshal7102 6 месяцев назад

SLC 500 L541 16K @@TimWilborne

@TimWilborne 6 месяцев назад

It is S:1/15 in it.

@marshal7102 6 месяцев назад

I'm not sure what you mean Tim can you clarify S:1/15@@TimWilborne

@TimWilborne 6 месяцев назад

You are trying to type S:FS in a RsLogix 500 program. It does not exist, it is S:1/15

@davidcunningham8318 9 месяцев назад

Always use an OTE w/a seal in so the equipment conditions define if it should be On/Off incl loss of power. First Scan? Oh please, I see OTL/OTU way overused it's essentially amateur programming.

@davidcunningham8318 9 месяцев назад

An OTL is ok for a sequencer as a memory bit that a Step or Event has occurred, thas only time I use it.

@TimWilborne 9 месяцев назад

There are plenty of practical uses for the OTL/OTU. As I said in this video the other week, just because you don't like an instruction doesn't mean you shouldn't understand it. ru-vid.comUeI8s4oc758