PLC Input Output Mapping / Buffering | IO Addressing Basics in RSLogix Studio 5000 Allen Bradley

PLC Input Output Mapping / Buffering | IO Addressing Basics in RSLogix Studio 5000 Allen Bradley
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One of the first tasks of PLC Programming is to properly map Inputs & Outputs. Although this task is fairly straightforward, many programmers either avoid it or implement it incorrectly due to their misunderstanding of it. IO Mapping or Buffering can help you in multiple ways. It allows one to contain all the primary input & output tags within a single program & easily manipulate them as needed. The necessity to manipulate may come from hardware failure or need to upgrade or expand the system. Furthermore, having these assets within a single program greatly reduces the time to troubleshoot and commission new systems.
In this video, we will be giving you an in-depth overview of IO buffering, discussing why it's important & what you can accomplish through this practice. Lastly, we will give you real-world scenarios in which this practice is important.
The simplest way to map inputs & outputs is to create a routine which will contain the tags linked to the modules & set them through OTE Instructions. In other words, each input module which specifies input tags will need to be mapped to internal PLC tags. For example, in Studio 5000, you'll need to map as follows:
Local:1:I.Data.0 - LocalInput[0]
Local:1:I.Data.1 - LocalInput[1]
Local:1:I.Data.2 - LocalInput[2]
Local:1:I.Data.3 - LocalInput[3]
... - ...
Each input will receive a corresponding tag on the PLC side. Similarly, each output tag which comes from the PLC will need to be mapped to the corresponding output. In Studio 5000, this is done as follows:
LocalOutput[0] - Local:1:O.Data.0
LocalOutput[1] - Local:1:O.Data.1
LocalOutput[2] - Local:1:O.Data.2
LocalOutput[3] - Local:1:O.Data.3
... - ...
The above practice is called IO mapping or buffering. Although this practice doesn't seem like a big deal, we will explore the reasons for doing so below.
Full Tutorial: wp.me/pac7uc-cc
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[@tradingsvivi1216]

Thanks again

[@roblemmon274]

Doing this is useful for you have to interface to other Engineers logic. If they change their tag it saves you time from having to change all your tags in your logic. All you got to do it change it once right before the end when their design is finalized. I did this all the time in Boiler Controls when I needed BMS signals. I just had dummy points on all my inputs and created my convention tag names on the outputs which I then used in all my logic.

[@Toymakr000]

Another advantage of "buffering" IO is that all the inputs can be updated nearly simultaneously at the beginning of a scan and the outputs at the end of a scan so there is no partial IO updates in the middle of a scan.

[@Kmreddsadad]

PLC Professor explains it exceptionally well th-cam.com/video/gBHW2DjDXwA/w-d-xo.html

[@shawnspencer8766]

Was just troubleshooting a roller coaster program in rs5k a few weeks back. It had zero I/O mapping, an absolute nightmare lol

[@sudhakumareee]

could you please advice how to program using structure script to if ... statement and do you have any example for 6 input to select 4 outputs.multplexer programs . thanks

[@romanpirs8127]

that function pof buffering can be done easier in TIA. if ypu have I0.0 = pushbutton
the you can change the hardware it s redirected I10.1 = pushbutton, it will change it in all the program. does Studio 5000 do something like that?

[@ahmedbouretali2656]

Nice feature. Now I'm thinking if hardwrare channel has been changed and the address it changed, the address in the logical var is not matching anymore, althought it works it can be confusing!

[@joseangelrinconluengo5331]

i have multiples DI. which is the fastes way to create the IO mapping, ex: you have Local:1:I:Data:1... to data:15, i need to create 6 more, ex Local2, Local3, ... to Local 6, which is the fastes way to do it, i know i can copy and paste and then chane one by one the number, you have any other idea? like change replace the number 1 by 2,3,4,5,6...

[@crazykenkid]

wouldn't using alias be easier? other then the de-bounce feature.

[@pk_hemmane]

dear sir pls find a logic to clculate rpm of a motor . the proxymative sensor placed on motor shaft .