Password Using PLC Siemens

PLC Type Simatic S7-200 Siemens,
Name Input / Output PLC :

INPUT PLC :
I0.0 ; Numeric 0 from KeyPad
I0.1 ; Numeric 1 from KeyPad
I0.2 ; Numeric 2 from KeyPad
I0.3 ; Numeric 3 from KeyPad
I0.4 ; Numeric 4 from KeyPad
I0.5 ; Numeric 5 from KeyPad
I0.6 ; Numeric 6 from KeyPad
I0.7 ; Numeric 7 from KeyPad
I1.0 ; Numeric 8 from KeyPad
I1.1 ; Numeric 9 from KeyPad
I1.2 ; ENTER Key from KeyPad

OUTPUT PLC :
Q0.0 ; Output to Green Light for Correct Password
Q0.1 ; Output to RRed Light for Wrong Password


Download PDF File:
password using plc siemens(.pdf)


Reading Ladder PLC Programming for Password using PLC Siemens :

Step 1 :
Password Data using VW20
a.VW20 = 5500 (can be modified and 4 Digits Decimal)

Step 2 :
Numeric 0 to 9 is pressed
Using VW0 for temporary data storage
a.If I0.0 = ON (Numeric 0) Then |P| M0.0 = ON AND VW0 = 0
b.If I0.1 = ON (Numeric 1) Then |P| M0.0 = ON AND VW0 = 1
c.If I0.2 = ON (Numeric 2) Then |P| M0.0 = ON AND VW0 = 2
d.If I0.3 = ON (Numeric 3) Then |P| M0.0 = ON AND VW0 = 3
e.If I0.4 = ON (Numeric 4) Then |P| M0.0 = ON AND VW0 = 4
f.If I0.5 = ON (Numeric 5) Then |P| M0.0 = ON AND VW0 = 5
g.If I0.6 = ON (Numeric 6) Then |P| M0.0 = ON AND VW0 = 6
h.If I0.7 = ON (Numeric 7) Then |P| M0.0 = ON AND VW0 = 7
i.If I1.0 = ON (Numeric 8) Then |P| M0.0 = ON AND VW0 = 8
j.If I1.1 = ON (Numeric 9) Then |P| M0.0 = ON AND VW0 = 9
Note : |P| = Positive Transition

Step 3 :
Count the number keypad is pressed
Using Counter C0 for Count data
a.If M0.0 = ON Then CU C0 = ON (Count UP Counter0 = ON)

Step 4 :
Enter Released for Reset Counter C0 (Count data RESET)
a.If I1.2 = OFF (ENTER key is Released) |N| Then R C0 = ON (Reset Counter0 = ON)

Step 5 :
Password from the KeyPad
Using VW14 for Password from the KeyPad
a.Keypad is pressed first, multiplied by 1000
If M0.0 = ON AND C0 = 1 then VW0 MUL_I 1000 = VW2
b.Keypad is pressed second, multiplied by 100
If M0.0 = ON AND C0 = 2 then VW0 MUL_I 100 = VW4
c.Keypad is pressed three, multiplied by 10
If M0.0 = ON AND C0 = 3 then VW0 MUL_I 10 = VW6
d.Keypad is pressed four, multiplied by 1
If M0.0 = ON AND C0 = 4 then VW0 MUL_I 1 = VW8
e.Sum all the data
VW2 ADD_I VW4 = VW10
VW6 ADD_I VW10 = VW12
VW8 ADD_I VW12 =VW14

Example :
Keypad is pressed :
first : Numeric 5 => 5 multiplied by 1000 = 5000
second : Numeric 5 => 5 multiplied by 100 = 500
three : Numeric 0 => 0 multiplied by 10 = 00
four : Numeric 0 => 0 multiplied by 1 = 0
Sum all the data = 5000 + 500 + 00 + 0 = 5500
So,Password from the keypad is 5500

Step 6 :
Check the number of digits
a.If C0 = 4 (4 times the keypad is pressed) Then M0.2 = ON

Step 7 :
Correct Password
a.If I1.2 = ON (ENTER key is pressed) AND M0.2 = ON AND Value(VW14 = VW20) Then S M0.3 = ON (SET M0.3)
b.If M0.3 = ON Then Q0.0 = ON (Correct Lamp)

Step 8 :
Wrong Password and Not 4 digits
a.If I1.2 = ON (ENTER key is pressed) AND M0.2 = ON AND Value(VW14 not same VW20) Then S M0.4 = ON (SET M0.4)
b.If I1.2 = ON (ENTER key is pressed) AND M0.2 = OFF AND M0.3 = OFF AND M0.4 = OFF Then S M0.5 = ON (Not 4 digits)
c.If M0.4 = ON OR M0.5 = ON Then Q0.1 = ON (Wrong Lamp)

Step 9 :
Green Light = OFF OR Red Light = OFF
a.If (M0.0 = ON OR SM0.1) AND M0.3 = ON OR M0.4 = ON OR M0.5 = ON Then R M0.3 (M0.3 = OFF) AND R M0.4 (M0.4 = OFF) AND R M0.5 (M0.5 = OFF)

Please Download Programming for STEP 7 MicroWIN :
Password Using PLC Siemens

See : Password PLC

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Password Using PLC
PLC Simulation