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Learn how to do analog arithmetic operations using the PLC exercise program in the Siemens PLC.
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0:07
hello everyone myself
0:10
badas in this video I will discuss about
0:15
simple analog arithmetic operation
0:19
example okay here we have two analog
0:24
values ai1 and
0:27
ai2 analog input 1 analog input
0:33
2 we have to perform the following
0:37
operations a i1 minus a I2 we have to do
0:42
the
0:43
subtraction ai1 + ai2 we have the
0:49
addition addition of two analog values
0:53
subtraction of two analog
0:55
values and the third one is ai1 + 5 100
1:00
that means we have to add a constant to
1:03
the analog
1:04
value and the third fourth one is a I2 -
1:10
500 now we have to subtract
1:13
-500 okay I mean we have to do the
1:17
subtraction of 500 from the analog input
1:20
2 then a i1 multiplied by 2
1:27
multiplication and a I2 divide by 3 so
1:32
we have to do these
1:35
operations okay using analog comparator
1:39
block and
1:41
analog amplifier
1:44
block okay we already discussed about
1:48
these blocks so try to solve
1:52
this in your software just pause the
1:56
video and try to solve it
2:02
okay now we will go to the
2:08
software now I will take two analog
2:12
inputs and give the
2:15
command
2:18
ai1 and the second one
2:22
is ai2
2:33
now we will do the a i1 minus a I2 so we
2:39
will do the analog value
2:41
subtraction for that purpose I will take
2:45
one analog
2:47
comparator so go to the analog category
2:50
and take analog
2:55
comparator and connect a i1 to ax and a
2:59
I2 to a
3:03
y okay and give the comment this is my
3:08
AI 1 minus
3:11
ai2 so this block will do the
3:14
subtraction
3:16
right and output we will connect One
3:19
open connector this output is digital
3:23
output I'm not using any digital output
3:26
here so we have to close this connection
3:30
when we are using
3:32
the program in the real PLC I mean when
3:37
we downloading the program to the PLC we
3:40
have to close the con unused connections
3:43
okay for simulation it will work without
3:46
this open connector also okay now we
3:51
will do the simulation go to tools and
3:54
select
3:58
simulation now now increase the a i1
4:01
value now it is 100 so 100us 0 the
4:05
output is
4:07
100 now I will increase the ai1 value
4:11
300 300 minus 0 300 now I will increase
4:18
ai2 100 300 - 100 200 I will equal the
4:23
values 300
4:26
300 output is zero
4:29
again increase - 200 so using simple one
4:35
comparator block we can do the
4:38
subtraction ai1 minus
4:42
ai2 now click the this Arrow selection
4:46
so the simulation will be
4:51
stopped now we will do the
4:54
addition for that purpose first I will
4:58
take one anal log amplifier block so go
5:03
and
5:05
take
5:09
now I will tell you what this block will
5:15
do go to the com properties and
5:19
comment
5:21
now
5:23
ai2 multiply by
5:28
-1 so the this block will do the
5:31
multiplication of ai2 with minus one so
5:34
I will connect
5:37
ai2 so now this block output is minus of
5:41
ai2 if ai2 value is 100 this block
5:46
output will be minus 100 now I will take
5:50
analog
5:54
comparator okay connect
5:57
this a to ulti minus1 output to the AI a
6:03
y second input of this
6:07
comparator and the first one I will
6:09
connect AI
6:13
1
6:17
okay just adjust these lines so we will
6:21
not get any
6:25
overlapping
6:27
good now give the comment for this
6:32
block what it will do a
6:36
i1
6:39
minus in Brackets minus a i
6:43
2 so it receives ai1 one input in second
6:49
input it will receive minus
6:52
ai2 so finally the output is ai1 + ai2
7:02
okay clear and connect One open
7:06
connector I don't want to use this
7:09
output signal
7:16
okay now go to tools and
7:21
simulation right now A i1 is 300 and ai2
7:25
is 500
7:29
okay but the output is not the same
7:33
right first we have to give this minus 1
7:38
so go to this block
7:40
property and it has to do the multip by
7:44
minus one so the gain we have to enter
7:47
minus one then only it will
7:51
work
7:52
okay see 300 + 500 output is 800 now I
7:59
will change the values ai1 I will
8:02
increase to 400 ai2 I will decrease the
8:05
value to 300 what is the
8:11
output
8:13
700 so this is how we can do the
8:17
addition of two analog values using
8:22
amplifier block and comparator block
8:27
okay now we will do the
8:30
ai1 + 500 right so click the arrow for
8:36
that purpose I will take one analog
8:40
amplifier
8:44
block go to
8:47
properties and we have to do the plus
8:51
500 that
8:53
means we have to use the offset I will
8:56
enter plus 500
9:00
remember when we change the gain or
9:03
offset
9:04
parameters this measurement range will
9:06
automatically change
9:09
accordingly no need to worry about this
9:11
range okay in this case just press
9:16
okay and I have to connect ai1 right so
9:21
go to top and select and drag and
9:25
drop
9:27
connect so I connect
9:32
AI
9:36
1 so what is the comment of this
9:41
block
9:42
ai1 +
9:45
500
9:48
okay and the output is
9:50
analog and select analog
9:57
flag now go to tools and
10:02
simulation what is the analog input
10:05
value 400 so 400 + 500 900
10:11
simple this is how we can do the
10:14
addition of constant value to the analog
10:17
value now the ai1 is
10:20
700 what is the value 700 + 500
10:25
1200 analog Flags when we add here we
10:28
can see the this output 1200 in analog
10:32
flag one in the window here bottom
10:36
window see am1 1200 okay now similarly
10:41
we can do the ai2 minus
10:46
500 for that purpose same
10:50
concept what will
10:54
change take one
10:56
analog amplifier
11:01
and we are
11:03
doing
11:05
ai2 minus
11:09
500 and we have to connect one output
11:12
which is analog
11:15
flag you can use any analog output no
11:18
issue here I'm just using analog flag
11:21
and we have to connect ai2
11:30
okay and go to
11:33
simulation what is the present ai2 value
11:36
300 so 300 - 500
11:42
is before that in
11:44
properties offset here we have to enter
11:49
-500 and
11:51
okay output is
11:54
-200 I will increase the ai2 value to
11:58
600
11:59
so 600 - 500 is 100 see
12:05
100 now we will do ai1 multiplied by
12:10
2 for that purpose how we can do any
12:14
guess pause the video here you can share
12:19
your idea or guess with us through the
12:23
comment section or try to do it
12:26
yourself again I will take the amp
12:30
I will go to the command and I will
12:32
enter ai1 multi by
12:38
2 again we need one output so I will
12:42
take analog out
12:45
flag and I will connect and we have to
12:48
connect ai1 here input so go to top here
12:53
like this Dragon drop connect and go to
12:57
tools simulation
13:00
what is the present ai2 ai1 value
13:03
700 so for this purpose to work we have
13:06
to enter the properties so go to
13:09
Properties multipli by two multiply
13:12
means always we have to use gain so I
13:15
will enter gain two remember range will
13:18
change no issue press okay see
13:23
400 now I will increase the value A1 to
13:27
900 what what is the output for
13:31
multiplication it is
13:34
1,800 okay now we will do the ai2 / by
13:41
3 so for that
13:44
purpose
13:47
again we have to use in this case
13:53
analog
13:55
amplifier and go to the commands
13:59
what we are doing here a I2 / by
14:04
3
14:08
okay and what is the
14:11
output we have to connect one analog
14:15
flag ai2 we have to connect so
14:22
again yeah two is
14:27
connected and go go to
14:32
properties here what we have to do is
14:35
take the
14:39
calculator we are doing ai2 divide by 3
14:44
so for that purpose what I will do I
14:47
will divide 1 / by
14:52
3 What is the value
14:55
0.333 so in gain we have to end enter
15:02
0.33
15:04
okay in this case we cannot directly
15:06
perform the division here again we have
15:09
to opt the multiplication only so what
15:13
I'm doing one I will do 1 IDE by 3 the
15:17
result I multiplied with ai2 okay
15:21
remember we will not get exact output I
15:24
mean value we will always get the nearby
15:27
value
15:29
what is the present ai2 I will decrease
15:32
it
15:34
to 100
15:38
okay so ai2 is
15:43
100 so 100 / by
15:49
3
15:52
33.33 here that is rounded off we got
15:55
only 33 okay now I will in is the ai2
16:00
value see what
16:06
happens now the ai2 is 400
16:15
okay so
16:18
400 divide
16:24
by
16:27
3 one
16:30
33.33 we got 132 here because we can
16:35
only enter two decimals
16:37
0.33 accordingly it is calculated
16:42
see 0.33 multiplied by 400 132 okay so
16:50
when the value is
16:52
increasing there will be an error
16:54
remember that when you are using the
16:56
this method okay so this is how we can
17:00
do
17:01
the multiplication addition subtraction
17:05
division using analog comparator and
17:10
amplifier
17:11
blocks now I will give you a simple TOS
17:15
okay try to do the same functions using
17:21
mathematical instruction
17:23
block we already discussed this block
17:27
okay previously
17:29
so try to complete these functions these
17:33
operations using that block and share
17:36
with us if you had any
17:39
problems okay let us know thank you I
17:43
will meet you in the next session
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