Create a function in RsLogix/Studio 5000
- Thread starter npham
- Start date
dmroeder
Lifetime Supporting Member
Check into the term AOI (Add-On Instruction). Build your own re-usable instruction.
dmargineau
Lifetime Supporting Member
Welcome to the Forum!
In the context of a Logix platform, "functions" are called Add-On Instructions, AOIs for short.
http://literature.rockwellautomation.com/idc/groups/literature/documents/pm/1756-pm010_-en-p.pdf
In the context of a Logix platform, "functions" are called Add-On Instructions, AOIs for short.
http://literature.rockwellautomation.com/idc/groups/literature/documents/pm/1756-pm010_-en-p.pdf
With an AOI, an associate data type will be defined. Therefore, every time I call an AOI I have to create a tag/instance of that type in order to compiles. I just want a simple function like a MOV function where I only need ma source and a destination. Also I'm using ladder logic.
dmargineau
Lifetime Supporting Member
You don't "...have to create an instance..."...You create the AOI only once...It will be in the Instruction Pallete just like your (apparently favorite) MOV...Just drag it onto a rung and define your INs (Sources) and OUTs (Destinations)...Just like your favorite MOV...Use any language you are capable of programming with...LAD, FBD, ST...
..and most importantly...READ THE MANUAL!...before having any opinions...
Apparently I've created an AOI before I made this post. FROM the MANUAL you are required to have an InOut Parameter which is an a tag with AOI data type. I can create a global tag and use it every time I call the AOI, but I don't want to create a tag that could cost confusion for someone else that try to use the function.
dmargineau
Lifetime Supporting Member
It seems you are trying to implement a Siemens feature within a Rockwell platform.
Logix platform does not offer Siemens user defined FC-like instructions but user defined FBs and they are referred to as AOI; they do have "memory" when implemented, however, the inconsistency with Siemens' FCs is the name of the "instance"; the required IN and OUT parameters will differ with each occurrence.
Name each "instance" with the intended functionality followed by a number or letter since each "instance" will perform the same function within a different application : e.g. StartStop_Pump_1, StartStop _Pump_2, etc. or SpeedReference_Conveyor_A, SpeedReference_Conveyor_B, etc.
RET
Member
You can use subroutines, pass tags into and out of it.
RET is on the money. A subroutine is similar to an FC in Siemens world, in that you just call it, pass it whatever parameters you want, and it returns whatever parameters you tell it to. No creating tags, just pass your existing ones.
You might get some more detailed answers if you are able to share an example of what you're trying to do, and how you would have done it on [other PLC platform], so that we can assess your situation more accurately, instead of just giving general vague advice.
You might get some more detailed answers if you are able to share an example of what you're trying to do, and how you would have done it on [other PLC platform], so that we can assess your situation more accurately, instead of just giving general vague advice.
theColonel26
Lifetime Supporting Member
Thread Necromancer here. Was searching for Functions in Studio 5000 and found this. Could have sworn I read that they added them to v32 but I can find where i read that now.
No he is trying to use a 61131-3 feature in the Fischer-Price toy that is Studio 5000.
Also a Function Block or Allen Bradley's retarded version of it, an AOI, does take up memory. Even if it has no tags in it. Further calling a global AOI instance repeatedly, is hack (I can explain why if it's not obvious). Third, if you have a global instance and want to use it in other AOIs you are violating separation of concerns.
No he is trying to use a 61131-3 feature in the Fischer-Price toy that is Studio 5000.
Also a Function Block or Allen Bradley's retarded version of it, an AOI, does take up memory. Even if it has no tags in it. Further calling a global AOI instance repeatedly, is hack (I can explain why if it's not obvious). Third, if you have a global instance and want to use it in other AOIs you are violating separation of concerns.
cardosocea
Member
At least no one suggested the use of parameters in subroutines... which is probably far worse with regards to separation and "hacking" a function.
BachPhi
Member
Free stuff he like
Function search he did
in AOI simple truth he found
Fear is the path, hate suffering he does
Function search he did
in AOI simple truth he found
Fear is the path, hate suffering he does
theColonel26
Lifetime Supporting Member
Oh it was suggested to me in a similar thread on Reddit.
Good I'll keep up the good work.
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