Micro800 Set and Reset Coil Connected Components Workbench
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- เผยแพร่เมื่อ 2 ต.ค. 2024
- In this video we are going to explain what the SET or Latch instruction and RESET or Unlatch instruction do for the Allen Bradley Micro800 PLC in Rockwell Automation's Connected Components Workbench software. The Micro800 line of PLCs include the Micro810, Micro820, Micro830, Micro850, and Micro870 PLCs.
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Good morning Sir,
I am a novice in automation but I have just embarked on a project with a Micro 850 PLC.
Thank you for your videos which are a precious help (even if I'm struggling a bit because I'm French and my English is basic 😂).
I've written my programme in Function Block because it's easier for me.
I use Set Reset blocks because I have contacts that give information and return to 0 and I have to keep this information until another contact Resets them.
On a Set Reset Block, if the Set input goes to 1, the Q output goes to 1. If the Set input goes back to 0, the Q output stays at 1 until I have a Reset input.
My question is, when I switch off the Micro 850 (machine contact stop) when Q is at 1, will Q still be at 1 when I switch it back on, or will it go back to 0 ?
Thank you
I believe it works the same way as the SET and RESET in ladder logic and it will retain its value during a power cycle but you should definitely test it.
Thank you so much
You are welcome
Thanks so much for this video. It has helped a nooby who has been thrown into the deep end here. A question. how do you use the same button to latch and unlatch light? I am currently banging my head against the wall over this.
See link below. It is for RsLogix 500 but Connected Components Workbench will be the same
th-cam.com/video/eQF-HGxXzAc/w-d-xo.html
@Tim Wilborne thanks mate. Got it working.
That's great to hear!
thank you for your help sir.appreciated
You are welcome
I started on the GE Series Six and its latch instruction (and general programming environment) had a couple of differences to it.
1) It is a monolithic instruction where the Latch and the Unlatch come in a pair. No scattering your latches (Set) and unlatches (Reset) willy-nilly throughout the program. No using multiple Sets or Resets per coil. Just one of each, and they are locked together for eternity. None of this latch in one routine, and the unlatch (if it exists at all) in the next routine nonsense.
2) The S6 limits the number of contacts that you can put on a rung to nine wide, seven deep, and that includes the coil. No rungs that span the globe (the most egregious example of this was a rung that a programmer from EDS put in his scheduling logic that took ten pages to print out. One rung, ten pages of listings. Of course, the greater issue in this case was allowing CompSci majors to touch PLCs at all). You get a 9 wide, by 7 deep rung, and it fits entirely on the screen. Thus sanity is maintained.
So, I think that AB has to take some of the responsibility of making such a mess of things. Which has lead AB-centric programmers to chastise us programmers that came from a civilized PLC for our "overuse" of latches.
Rather than say that you should go easy on the use of them, ask where latches are best used? The simple answer is that a latch/unlatch rung will retain its state after power cycling your PLC (something else that AB PLCs have been known to require that other PLCs haven't). If you use a normal coil, then the state of that coil gets set to 0 after a power cycle, on a latch/unlatch coil, it retains its state.
So for a practical example, in the conveyor world where a carrier comes into a stop by making and then releasing the "AT STOP" limit and then waits behind the stop for its turn to leave, you wouldn't want to lose the status, or "whereabouts" of where your carriers are in the system after a power cycle.
So use latches where it is important to retain a memory of an event, use coils where you want the PLC to reset its conditions.
Will it?😜 We'll talk about that next week.
@@TimWilborne Well, for PLCs that didn't come inside of a Happy Meal box... :)
It is a little more than I can explain in a comment. You must first make the outputs retentive THEN we can talk about prescan (the scan before the first scan). Stay tuned till next week ;)
@@TimWilborne I know where this is going. I can wait. :)
Hi Tim thank you for making all these great videos. They are very helpful especially for a freshman to automation industry like me. Could you make a video on how to size circuit break, how and when to use fused circuit break vs fuse block + circuit break, and how to size the transformer?
Thank you very much Tim
Hi Shengyi. That is a little outside of the focus of this channel and there sin't a one size fits all answer but I might be able to give some basic guidance and point you to the right section of code to figure it out. Let me think about it.
Tim Wilborne Thank you Tim, if you could share which section of code you use and maybe a case study on how you use them, that will be greatly helpful. Thank you again Tim!
Dear sir,
When i using Tia 14 of siemens , i usually use memory addressing for ladder coding. It means i usually set and reset memory bits, in plc memory. Is there any way that i can set & reset memory bits in ccw🤔
Thanks a lot sir.
Yes, you just need to create a Boolean tag.
@@TimWilborne thanks a lot sir❣️
That's good stuff...like the way you put it across
Thanks!
@@TimWilborne where is the accent from
Hi Tim, i use sqo allot on slc 500
Im just starting up on the ccw software but i cant find an sqo anywhere ?
Cheers
Luckily there isn't one :-) Here's an old lesson I wrote, if you read my commentary in it I discourage the use of the sequencer instruction for this very reason. It's not available in most platforms. I'm getting ready to work on a series that will show different ways people sequence machine steps using basic ladder logic, function blocks, and structured text.
twcontrols.com/lessons/rslogix-500-sequencing-machine-steps-part-7-sequencer-instructions
Haha i like the young man bit as i have been through a very similar scenario with another older more experienced programmer and he told me its hard to fault find on. It is a shame as i love the sqo and how easy it is and what it can do, but im looking forward to seeing your method of sequencing on the CCW software.
Cheers
hi Tim, thank you for making all those great videos. They are very helpful. i have a project in whish i need to take ths speed of motors to control the speed of other motors
my set-up: Allen Bradley Micro850 (2080-LC50-48QBB), encoder with only "A" sensor, 2080-MOT-HSC module, 2085-OF4 module and Penta-Drive KBCR-240D
i look your videos on HSC, verrrry helpfull, but i still didn't try it with the speed of motor, not sure if i need to use 2080-MOT-HSC
and i will like to see a video to configure the 2085-OF4
THANKS AGAIN FOR ALL YOUR VIDEOS :)
i forgot..., my encoder is a "Line Driver4" rather than Open Collector
Good work!
Thank you