RSLogix 5000 FOR Loop Ladder Tutorial | Advanced PLC Programming Example for IO Buffering

RSLogix 5000 FOR Loop Ladder Tutorial | Advanced PLC Programming Example for IO Buffering
PLC Programming is always tied to input and output processing. In every program, a PLC Programmer must create a routine that will handle the inputs and outputs based on the requirements of the system. It’s common to create a special routine that will handle IO buffering and thus add a timed check on the input or output point as needed. A FOR loop is a common programming structure used in most high-level languages. It allows the programmer to easily cycle through a number of data in little code. In RSLogix 5000, a FOR loop is an instruction that carries the exact same functionality. A FOR loop can be used in a variety of applications. One of the easiest to illustrate and apply in PLC programming is IO buffering.
⏱ Timestamps
00:00 - Introduction
00:46 - IO Buffering Ladder Logic PLC Programming
04:30 - FOR Instruction in RSLogix Studio 5000 Implementation
07:28 - FOR Instruction Validation & Logic Testing
09:44 - Array Out of Bounds Fault - PLC Troubleshooting
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[@ilhemtitou8706]

Thank you very much indeed. Could you share with us cascade, split-rang, ratio loops, please?

[@potvin1975]

Awesome vid! Thanks for that.

[@davidaustin6228]

Maintenance guys usually hate index addressed tags, makes it difficult to cross reference. Other option is to use an Addon for Input and output timed buffering.

[@SolisPLC]

I try to teach every maintenance tech / mechanic / electrician how to understand these structures. Once they see them, they usually don't have too much trouble. That being said, everything can be taken to the extreme and I've seen multiple instances in which loops are nested to the point that even I have a hard time figuring out the intended use. I certainly would not overuse them in programs, but if you have to manually get a lot of the same rung into the program that shouldn't change much, I would be all for it.

[@messaoudbernia6256]

@@SolisPLC I used to set the prest of each timer from the HMI, if we follow your method, can we make it separatly for each of your 32 timers, or they shoud have the same prest time, thanks

[@gidevaldosantos7319]

Muito Bom!

[@JCARLOSTLN]

please, can i use for loop instruction in emulate - 5570 controller

[@ilyukchiljin7640]

er.. you have to set preset time on each timer instance? what happens if you have 100 instances? coming from omron, this approach seems rather absurd..

[@SolisPLC]

There are ways to set them programmatically. You can use an array and a FOR loop if they're all different. If they're the same, you can use the same timer; there's no limit on the instructions one can use to call.

[@ilyukchiljin7640]

@@SolisPLC thanks for clarifying. Transitioning from omron to AB, I see some similarities but lots of differences as well. Some things on rslogix feels odd to me but I guess I'll get used to them over time.

[@alexmarks8285]

use FAL

[@alexmarks8285]

Use FAL or make the setting of the PRE part of the FOR loop subroutine