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hello everyone myself badas in this
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video I will discuss about analog
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comparison here we have two analog
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inputs ai1 and ai2 analog input one
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analog input two so we have to compare
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or we have to generate three status bits
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which are greater than less than and
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to for this we are not going to use
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comparator block and we have to complete
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okay first open your PLC
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software now take two analog inputs
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2 now I will use two analog amplifier
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blocks this is for scaling and also
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in logo PLC we have to use analog
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amplifier block for driving an analog
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input or for scaling an analog input
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okay and give the block name this
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1 and I want to use 0 to 100 scale so I
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have to adjust the gain the default is 0
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to th000 and I have to enter
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0.1 then the scale is 0 to 100 you can
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use any range as per your
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okay and this one is I will give the
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block name amplifier 2 and again I will
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0.1 so the output range is 0 to 100 the
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default range in logo PLC is 0 to 1,000
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okay now connect these analog input one
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and two to these blocks
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okay now for comparison purpose I will
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use analog threshold trigger blocks so
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threshold trigger blocks so I will give
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the comment instead of block name
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and I give the comment same for the
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okay now connect this amplifier one with
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analog threshold Trigger
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1 similarly connect the second one
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amplifier to Output with analog
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now for comparison purpose we have to
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give analog input one values in analog
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block s similarly we have to give analog
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two analog input two values to the
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unlock threshold trigger one block then
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only the comparison can happen right
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each block must have both inputs for
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that purpose click this plus symbol and
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here also plus symbol
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and unlock the should Trigger 2
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also now what I will do I will connect
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analog amplifier 1 output which is
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ax to the analog threshold trigger to on
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field again I will connect analog
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okay I just want the comparison must
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happen with single number only there is
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no need to compare on value and off
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value at different values right that is
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why I connected this ax to the both
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inputs of on and off of analog threshold
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Trigger 2 block similarly I will do the
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same thing for the next one I click this
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Conn at amplifier 2 output ax to
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the analog threshold trigger one on
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field and again ax to
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clear now I will take two digital
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outputs and give the name for q1 this is
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than a i1 greater than ai2
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okay now the program is
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completed so I will go to the simulation
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go to tools and start
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simulation now ai1 and ai2 both are 0
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okay right now I will increase a i1
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now ai1 is 20 ai2 is zero we can see the
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value a amplifier 2 is zero and ai1 is
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so ai1 is greater than ai2 that is why
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the greater than output is on q1 is on
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ai2 now ai2 is also 20 that means both
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20 if you see these values will go to
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this on and off parameters
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also now greater than is off less than
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is off now I will increase anlog input
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2 now it is 40 ai1 is 20 ai2 is
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means this less than is on ai1 is less
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see the on and off parameters the
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reference values of both the analog
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threshold trigger one and two blocks are
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dynamically then only this comparison is
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happen that is why we connected this ax
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this on and off parameters we just want
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to compare at single value that is why
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both are connected to the same
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values you can try with a different
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values what will happen you can observe
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in your simulation no
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required so this is how we can do the
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without using comparator
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okay now a task for you if you see we
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completed greater than less than right
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and the pending one is equal to I will
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give you one hint now right now ai 1 is
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50 ai2 is 50 both are same values and
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when both are same values if you see
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analog threshold trigger one output is
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off similarly threshold trigger two
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block output is also off you can use
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status to generate equal to status equal
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to Output okay just pause the video here
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and try to complete the
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task try to use basic
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gates for the equal to option okay
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now I'll continue with the equal to so
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I'll come out of the
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simulation what I will do I will take
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output Q3 and this is my equal
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now when A1 and A2 are equal both
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outputs are 0 0 right for that case I
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gate okay this is end
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Gates I will connect analog threshold
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trigger one output to the not gate and
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not gate output I connect to the end
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gate similarly I will connect threshold
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trigger two output to the not gate and
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not get output to the end
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gate then when both are 0 0 I will get
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equal to status simple you can use not
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block two blocks or simply you can
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PLC if you double click here not gate
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will appear bubble will appear see dot
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appear that means the input is inverted
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not is given okay in simple way you can
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do like this also or you can use not
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block also two blocks now I will connect
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again I will give the
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not I will double click here
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okay now I will do the
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simulation for the equal
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to right now A i1 is 50 and ai2 is 50
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both are equal see Trier unlock ual
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trigger output one is off similarly
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trigger two output is off
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and with the combination of not and end
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on so this is how we can generate
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greater than less than equal to status
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from two analog values okay try to do
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this program in your PLC software
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implement this type of comparison using
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some other block combinations
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also now another task is for you that
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try to complete or generate this greater
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than less than equal to with combination
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of some other blocks and share with us
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how you implemented this type of
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program through the comment
