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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 playground swing timer so let's
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look at the example first playground
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swing timer when a child starts swinging
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a Time timer should count down from 30
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second an alarm should sound when time
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is up a reset button will start count
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again that means when we turn on the
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button and then the alarm will turn on
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after 30 second so that means the child
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will swing for 30 second and after 30
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second an alarm should should uh get on
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then to start the new round the reset
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button is used so when reset button is
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used the alarm will again turn on after
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30 seconds allowing the child to swing
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for 30 seconds so for this example we
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will use normally open contact and
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contact and with that we will also use a
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timer that is on delay timer t on so
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let's move to TI portal where we will
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draw a ladder diagram for this
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example so this is the interface of TI
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after configuring the device we will go
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to PLC tags and then default tag table
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so here we need to add the input and the
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output so we have two inputs firstly we
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button and then we have one more input
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button and then we have one output that
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so the alarm is an output so its address
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0.0 and after that we'll go to program
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blocks and then main ob1 I will double
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it so here we will be drawing letter
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diagram for playground swing timer so I
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will minimize this and then zoom into it
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this so firstly I will inser insert a
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normally open contact
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here and then I will insert a coil so
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this normally open contact will be a
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start button so I will write start and
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select start button from the list it is
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the same list we have made in the PLC
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tag table and then this is the coil
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which will be used for alarm so I will
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write ala and select alarm from the list
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so when start button is turned on the
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child will swing and after 30 second
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alarm will turn on so this alarm will
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turn on after 30 second for that we will
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use a timer operation here and it should
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be t on so I will double click on T on
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okay so I will take it uh here and then
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I can uh give the preset value here for
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t on on delay timer that is 30
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seconds so when start button is turned
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on alarm will not immediately turn on it
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will wait for 30 seconds and in those 30
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seconds the child will swing and after
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swinging for 30 seconds alarm will turn
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on and to reset the alarm we will use
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one more input that is reset button so
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here we will be using reset button as
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normally Clos contact so I will write re
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e s and select reset button from the
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list and then when reset button is
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pressed and released this alarm will
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again wait for 30 seconds allowing the
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child to swing and after 30 seconds
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after 30 seconds of swinging alarm will
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on and after that we will also simulate
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here I will click here that is start
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simulation uh then I will click on okay
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configuration click on
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load and then click on
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finish and after that I will start the
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CPU here click on okay and then I will
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monitoring and after starting the
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monitoring let let's go to switch to
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here here we need to create a new
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project let's press crl + n and enter
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it's creating the new project it will
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take some time let's wait for it to
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complete this process
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click here and then simulation tables
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and then double click on simulation
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table one and after that right click
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here and click on load project tags so
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all the PLC tags are being listed here
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so we can modify the uh value of start
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button so when I turn on start button a
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timer will start and this timer will
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start from it will count down from 30
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seconds so 7 8 it will go to 10 uh 30
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second and after 30 second the alarm
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will turn on and in those 30 seconds the
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swinging and after 30 second alarm will
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on so as you can see here here it's 28
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29 and 30 and after 30 second alarm will
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turn on and to start this we will use
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the reset button so when it is pressed
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and then released the alarm will again
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turn off and it will wait for another 30
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seconds and in those 30 seconds the boy
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swing and he will swing for 30 second
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and after 30 seconds again this alarm
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so as you can see here after 30 seconds
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alarm again turns on and it needs the
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set button to be pressed and release so
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alarm gets off and after 30 second it
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will again turn on it was all about this
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example thank you for watching
