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Learn PLC application for school bell automation project with ladder logic, timer-based control, real-time scheduling, and practical automation examples for beginners.
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PLC Application, School Bell Automation, PLC Project, PLC Programming, Ladder Logic, Automation Project, Industrial Automation, Control Systems, PLC Training, Timer Based Control, School Automation System, PLC Examples, PLC Tutorial, Automation Engineering, Educational PLC Project, PLC Logic Design, Real Time Scheduling, Beginner PLC
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0:07
hello everyone myself
0:11
badas in this video I will discuss one
0:15
interesting PLC
0:18
example which is school bell
0:23
system in this program we have to
0:27
automatically turn on a school full Bell
0:31
for 5
0:32
seconds at defined time and day okay
0:37
like school begin time break time end
0:40
time like that if you see the Bell has
0:44
to ring from Monday to Friday okay every
0:49
Monday to every
0:50
Friday at times 8:00
0:54
9:45 10:00 12:45 13:30
1:00
and
1:01
16:30
1:02
okay on Fridays only on Fridays the Bell
1:08
has to ring at 5:00 evening 5:00
1:14
170 okay this we have to implement in
1:18
our logo
1:20
PLC you have to remember that your logo
1:24
PLC must support real time clock okay
1:31
RTC real time clock the PLC must have an
1:36
inbuilt internal clock then only it will
1:40
support these type of programs that you
1:44
have to
1:46
remember you have to ensure that your
1:49
PLC model has an integrated realtime
1:52
clock this is
1:54
optional there is no need to present
1:57
this real time clock in every PLC that
2:02
you have to remember okay now open your
2:05
PLC
2:10
software for this program we need weekly
2:15
timer block so under timer category
2:19
select weekly
2:24
timer and open give the block name
2:29
weekly timer one this is my block one if
2:35
you see go to your
2:36
objective this school bell has to ring
2:39
from Monday to
2:41
Friday at 8:00 9:45 and 10:00
2:47
okay so Monday to Friday we have to
2:52
pick Monday Tuesday wednessday Thursday
2:56
Friday right and you have have to untick
3:01
remove the disabled these are timings on
3:04
time and off time now what is the time
3:08
8:00 right so first we have to enter 80
3:13
on time is 8:00 and off time is
3:18
8:00 we can enter only in hours and
3:22
minutes there is no option for seconds
3:25
if you see our object two the school
3:28
bell has to ring only for 5 seconds okay
3:32
this you have to remember every time on
3:35
Monday to Friday or on only on Friday at
3:38
the specified times it has to ring only
3:42
for 5 seconds that we will see how to do
3:45
that but in this block there is only
3:48
option to enter in hours and minutes
3:52
there is no seconds so the minimum value
3:55
we can enter is 1 so at 8:00
3:59
it will turn on and at 8:00 1 minute it
4:04
will turn off on these specified
4:07
days okay next what is the value
4:11
945 okay so again select Monday to
4:16
Friday you can select as per your
4:20
requirement and untick
4:22
this
4:24
and enter the timing
4:27
9:45 the minimum of time we can enter
4:30
here is 1 minute so I will just enter
4:35
9:46 again next time is
4:39
10:00
4:41
again take all the required
4:45
days and enter the
4:47
time 10:00 and off time
4:52
is add 1 minute that is the minimum
4:55
amount of time we can add here and click
4:58
okay remember each timer block weekly
5:02
timer block have inbuilt three options
5:05
three conditions we cannot there is no
5:08
option to enter more right so click okay
5:13
now what I will do I will take one
5:16
more timer
5:21
block and open the properties and give
5:24
the name weekly timer two block two
5:30
okay and
5:32
uh 9 8 9:45 10 are completed now we have
5:38
to enter
5:40
12:45 again select Monday
5:44
Tuesday Wednesday Thursday Friday and
5:49
enter the time
5:53
12:45 half time is
5:57
12:46 you can enter 474 48 also no
6:03
problem and now next one is
6:09
1330 again take the required blocks I
6:15
mean this and
6:17
uh enter
6:20
13
6:23
30 half time 13
6:26
31 and next one is 6 16:30 evening 4:30
6:33
p.m. again
6:35
enter
6:40
similarly and
6:42
enter
6:45
16 30 half time is
6:50
1631 okay now Monday to Friday timings
6:55
are completed right now the remaining
6:58
one is only only on Fridays the Bell has
7:01
to ring
7:02
on 5:00 p.m. okay for that we have to
7:07
take one more weekly timer
7:09
block and go to the
7:11
properties add the block name weekly
7:14
timer 3 and we have to select only
7:17
Friday here because the condition is on
7:20
Fridays only Bell has to ring at 5:00
7:24
p.m.
7:25
Okay
7:28
so enter
7:30
17 and
7:34
1701 click
7:37
okay now
7:40
this timings is completed day and times
7:44
are
7:45
completed remember this weekly timer
7:48
blocks output is digital output at the
7:51
specified day and time the output will
7:55
be on and off okay now we need one basic
8:00
function and which is R okay we have to
8:05
connect all these outputs to this R
8:10
Block and give the comment block name
8:14
comment or block name okay or if you
8:20
see if your school bell has to ring for
8:22
1 minute then our program is completed
8:26
you can simply connect the school bell
8:27
output to this R gate
8:30
for 1 minute at specified day and time
8:33
the output will be on and off okay but
8:37
in our case the school B has to ring
8:39
only for 5
8:41
seconds okay for that we need some type
8:45
of blocks combination of blocks such
8:48
that in this 1 minute on
8:52
time the actual output school bell has
8:55
to on for only for
9:02
5
9:03
Seconds first we need timer block I'm
9:06
taking on
9:09
delay and then open the properties or
9:13
first we'll give the on
9:15
delay and which is 5 Seconds click okay
9:20
next I need one XR block okay and now I
9:25
will take one output this is our
9:30
School Bel now I will connect argate
9:33
output to the XR give the block name
9:39
xer and for this I'll give the
9:43
comment school
9:48
bell
9:50
okay now I will
9:53
connect argate output to the timer block
9:57
also and timer block output to the XR
10:01
input and the XR output is school
10:20
bell now the program is completed we
10:24
will simulate and test the logic
10:27
okay go to tools
10:29
and click
10:33
simulation now we will simulate the day
10:37
and time first we will
10:41
check Monday 8:00
10:45
okay and click this clock
10:49
icon
10:51
okay I will change the
10:56
date uh like August
11:00
6 20 40 is selected I will change to
11:07
2025 I will s it August 11 August 11
11:13
is Monday okay I will change the time to
11:18
7
11:20
59
11:22
55 and I will
11:26
click
11:28
apply now the time is 7:59 at 8:00
11:32
weekly timer 1 is on XR output is on
11:35
school bell is on timer is
11:37
started when the timer is completed it
11:41
will give the output to the XR gate and
11:44
XR will
11:46
be turn off this school bell you check
11:49
again I will show you
11:52
this XR and on delay block again before
11:55
that we will see the weekly timer right
11:57
now it is in on State
11:59
it will be on for 1 minute and then
12:02
weekly timer will be
12:04
off what is the weekly timer on and off
12:06
values time values at on time is exact
12:10
8:00 off time is 8:00 1 minute now I
12:15
will increase the
12:20
value
12:22
8 one okay time is already completed
12:25
we'll
12:27
see of
12:29
okay we entered more value no issue
12:31
after 1 minute weekly timer output is
12:35
off so we will check again
12:38
this xor and on delay we will check with
12:42
another value at 9:45 Monday to Friday
12:45
again it will on so we will check
12:48
that Monday to Friday right now I will
12:52
take November some random date 20
12:57
Thursday 9:45
12:59
right so I will enter
13:02
9
13:04
44
13:07
apply at 9:45 this timer bit is on R
13:11
output on school bell on XR both inputs
13:14
are different that's why output is on
13:16
when on delay is
13:19
completed X or second input will be on
13:22
right that means X are both inputs are
13:26
same 1 and one when X are both inputs
13:29
are same output will be off when XR both
13:33
inputs are different then output will be
13:35
on so this is how I am only turning on
13:39
the school bell for 5
13:41
seconds you can change the required time
13:44
value
13:45
here
13:47
so this is how it this program works
13:51
okay now we will check the block two
13:54
also weekly timer two block we will
13:57
check 133
14:00
value mean time now I will change the
14:04
year 2030 I will enter and I will go to
14:08
June and 18 Tuesday okay I will enter
14:14
13 29
14:18
apply at
14:20
13:30 weekly timer 2 is on R output is
14:24
on xr1 input is one and zero output is
14:27
on after 5 Seconds both inputs are same
14:31
output is
14:32
off very
14:35
simple now we will again turn off
14:39
this apply after 1 minute timer to
14:43
Output will be
14:45
off again X are both inputs are 0 0
14:50
output is also in zero State 1 one or 0
14:54
0 output is in off state only okay we
14:59
can check the weekly time three also
15:01
required only on Fridays at
15:04
5:00 one more time school bell will on
15:07
again I will change the year let's say
15:14
2050 October only on Friday so 28 apply
15:19
so I have to change the time also before
15:24
that okay so 16
15:30
49 no sorry 59 55
15:34
apply so at 7 at 17 at evening 5:00 p.m.
15:39
this weekly timer 3 will be on our
15:42
output on school bell on 5 seconds after
15:45
school will school bell will be
15:47
off so this is our school bell system
15:52
okay and I will give you one simple task
15:55
for you to you okay this stocks are only
15:59
meant for practice and programming
16:02
purpose so that you will get more and
16:04
more ideas
16:07
okay this weekly timer and up to hour
16:12
block there is no need to change any
16:14
program after r i used exr and on delay
16:19
combination right now you try to do or
16:23
try to use any other combination of
16:26
blocks and try to achieve the same
16:29
result okay and share with us what is
16:32
the idea you got and how do you
16:34
implemented it
16:37
okay thank you I will meet you in the
16:40
next session
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