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hello everyone welcome to automation
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Community today in this video we are
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going to discuss an example which will
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be about classroom Bell so let's look at
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first classroom Bell System the Bell
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should ring for 10 second after after
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every 45 minutes if Ed button is
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pressed then there will be a time delay
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of 15 second for the Bell to get on so
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instead of 45 minutes we will take only
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1 minute so when the start button is
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turned on the Bell will turn for 10
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seconds and it will wait for 60 seconds
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and then the Bell will again turn on
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then again we'll wait for 60 seconds and
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then again we'll turn on for 10s seconds
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and if the add button is pressed then
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will uh the Bell will again wait for 15
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seconds and then get on so let's move to
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TI portal where we will draw a lder
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diagram and use normally open contacts
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and normally close contacts and with
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that we will be also using some memory
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bits and timers like TP and T on so this
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is the interface of di portal version 16
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firstly I will go to PLC tags
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then default tag table I will double
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click on it here we need to add our
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inputs and outputs so the first input is
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start button and then we have one
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more input that is ADD button and then
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we have one output that is
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alarm alarm or Bell so I will write
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Bell so this is an output so its address
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will start with q and then 0.0
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and after that I will uh go to program
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ob1 so here we will be drawing ladder
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diagram so I will zoom into it like this
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and then I will insert a normally open
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contact and a coil so this normally open
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contact is a start button and then there
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will be a Quil that is for the
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P so when start button is turned on Bell
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gets on for 30 second sorry for 10
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seconds for that we will use a timer
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operation and that will be TP and the
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preset value for TP is 10
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seconds and after 10 seconds the Bell
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will turn off and it gets off for 1
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minute so for that I will open the
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branch here add a coil so this coil will
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be a memory bit so this will be m0 point
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0 so this m 0.0 should get on after 1
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minute so the preset value for t on will
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seconds with that this t
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on here we will insert a normally closed
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contact and it will represent the
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bell and with that we will use here a
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normally close contact and this will be
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0.0 and then we'll go to another Network
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here we will use add button here as
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contact and then I will insert a coil so
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this Quil will be one more memory bit
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and this memory bit should get on for 15
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seconds so for that we'll use a TP here
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and this TP will be the prec value for
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this will be 15 seconds and this m 0.1
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will be used here as normally closed
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contact so this will be m0
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.1 so what happens when start button is
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turned on Bell gets on for 10 seconds
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and after 10 seconds Bell gets off and
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when it gets off M 0.0 gets on after 60
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seconds and with when it gets on here
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the current will not flow through it
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this gets off and then when it gets off
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this gets off and then again the current
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flows through it and Bell gets again on
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and then if Ed button is pressed this m0
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.1 gets on for 15 seconds and for 15
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seconds this m 0.1 gets on with that the
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Bell will not turn on for 15 seconds so
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we'll start the simulation
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finish and after that I will uh start
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monitoring and after starting the
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monitoring I will switch to project view
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here and then let's create a new project
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let's go to simulation tables and then
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here and then load project
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here when start button is turned on the
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Bell gets on and it gets on for 10
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that it gets off for 1
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and after 1 minute Bell gets again on so
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if you need to uh if you press add
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it was all about this example thank you
