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Omron PLC Subroutine Instructions: SBS, SBN, RET
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Jun 4, 2025
Learn SBS, SBN, and RET instructions in Omron PLCs to create subroutines in ladder logic. Ideal for modular programming using CX-Programmer software. JOIN OMRON FULL COURSE HERE: https://learn.automationcommunity.com/courses/omron-plc-training-course-using-cx-programmer/ #omronindustrialautomation #instructions #electrical Tags: omron plc,omron plc subroutine,sbs sbn ret instructions,sbs instruction,sbn instruction,ret instruction,omron cx programmer tutorial,ladder logic subroutines,plc subroutine programming,how to use sbs sbn ret,plc modular programming,plc tutorial in english,plc subroutine example,omron plc ladder logic,omron plc training,plc engineering,industrial automation,ladder logic for beginners,omron cx programmer,plc programming techniques
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[Music]
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hi everyone welcome to automation
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community In this session we are going
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to see about screens in Omrron PLC So
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before entering into the topic kindly
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like and subscribe our channel for more
0:28
updates and videos sub routine So it's
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like a
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functions in you know software
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programming like in Python or C C++ and
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all we will be writing the function
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Whenever you want to repeat some task
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you will be writing that in the function
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and whenever you want you will be
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calling that function Same like that in
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ladder logic we can able to write a set
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of you know instruction or a task inside
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one uh subroin and whenever you want you
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can call that subroin Okay So it's like
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a function in ladder logic All right So
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we have subroin and subroin entry and
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subroin return So all these three
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instructions are combined If you if you
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want to use a sub routine concept you
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have to use all three instruction in
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your ladder
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logic So the instruction will be looking
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like this And how to find out which
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subruine you are referring to by using
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the subruine number So we have to assign
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the subruine number for the each subroin
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and whenever you want you can call by
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its number
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Okay So first we have to use the sub
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routine okay SBS and you have to call
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that by using some run condition over
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here and if this number n is matching
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with the subroin it will perform the
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task which is inside this subruine okay
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and you have to end the subroin using
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the return
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function So by using this subroin region
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you can able to fix okay this is the
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function we have to perform if it is
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called like that All right So let's see
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that in
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the L
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logic Okay So I'm going
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to have some run before calling the sub
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routine It's like our normal uh you know
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task It's like a normal run Okay So now
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you are going to call the sub
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routin So to call the sub routin we have
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to use sbs n the number of your sub
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routin Okay I'm assigning that sub
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routine as
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zero Okay All right So now you have
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to write the sub
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routin So for that you have to enter it
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Enter into the sub routine first SBN is
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the sub routin
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Enter Okay And now you can write the
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function You can do some addition
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subtraction what and all you want You
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can write as of now I'm going to perform
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just a digital
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operation
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okay just
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have and here you can end it done you
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can write multiple lines also ex for
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example only I'm just explaining this so
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I'm ending my function That's it Okay
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Now go for a
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simulation Okay Now so now we are going
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to
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perform this function See just turn on
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this
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output Your output
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is on Why because I have used both the
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same input
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I just change that first because your
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sub routine is called so it is
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[Laughter]
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performing Now if you turn on this 0.06
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your output will not be in on condition
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Look at that
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your output is off because the function
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is not called yet calling in the sense
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what you have to make this condition
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true that's it that's what I'm meaning
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that as calling see once you called that
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your output is
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on for example you turn off this and you
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turn off this your output will not go to
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off condition because you cannot able to
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turn on and turn off until the function
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is called Okay if you call the function
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automatically output will go off because
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your input condition is off Okay so this
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is how sub routine will work And how
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about
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this this will be working as normal
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RAM Whenever you want you can turn on
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Whenever you want you can turn off This
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is
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independent Okay So this is how subroin
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is working
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in home run PNC and what if if you are
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not using the return
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condition let's see compile it and you
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can
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see there is error here look at this
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invalid SBN end in SBN so return is must
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without that you cannot able to perform
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wrong Okay What if you have not called
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the
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function I have cut the SBS the calling
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of the function i have done
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the I have edited See there is a zero
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error That means what the program is
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accepting the way you have written
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But when it comes to the operation it
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will not turn on your output because you
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have not called the function Simple
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right this is not throwing an error that
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you have to put SBS before SBN But it's
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not showing there is an
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error
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Okay
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So SBS is also mandatory one
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What if you have not entered the
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function now it will show an
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error See error SBN is not
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defined Okay So like this you can
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understand the working of sub routine
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and what you can use the nested sub
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routines
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also So I'll show you how to use that
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So write one more
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[Laughter]
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bntor So write any condition
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here Just connect some output
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Okay All right So
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return and for this calling I'm going to
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put inside that sub routine Before that
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we have written one sub routine Oh I'm
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going to put
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share
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PS one I'm going to call here This is
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nested
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See I'm turning on
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my I'll turn on this second subutance uh
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function Your output is
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off because it's not called yet correct
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so let's call this SBS1 Let's call
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this let's call this but still your
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output is off Why because you have given
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the sub routine inside the sub routine
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So you have to call this sub routine
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first Correct you call this
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first your output
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is automatically getting update Okay
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This is called as nested sub
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routine
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See I have put the sub routine here You
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have to put the different number All
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right So this return is for the first
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sub routine you have used So the return
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you have used first return you have used
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is for sub subruine zero The second
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return is for the second subruine you
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have declared All right So this is how
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sub routine will be working in home run
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PLC I hope you have understood the
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concept Kindly like and subscribe our
10:15
channel for more videos and updates I'll
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meet you in the next session Thank you
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[Music]
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