Password Using PLC Keyence

PLC Type KV, Name Input / Output PLC :

INPUT PLC :
0000 ; Numeric 0 from KeyPad
0001 ; Numeric 1 from KeyPad
0002 ; Numeric 2 from KeyPad
0003 ; Numeric 3 from KeyPad
0004 ; Numeric 4 from KeyPad
0005 ; Numeric 5 from KeyPad
0006 ; Numeric 6 from KeyPad
0007 ; Numeric 7 from KeyPad
0008 ; Numeric 8 from KeyPad
0009 ; Numeric 9 from KeyPad
0010 ; ENTER Key from KeyPad

OUTPUT PLC :
0500 ; Output to Green Light for Correct Password
0501 ; Output to RRed Light for Wrong Password


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


Reading Ladder PLC Programming for Password using PLC Keyence :

Step 1 :
Password Data using DM0020
a.If 2002 = ON (Always ON) Then DM0020 = 5500 (can be modified and 4 Digits Decimal)

Step 2 :
Numeric 0 to 9 is pressed
Using DM0000 for temporary data storage
a.If 0000 = ON (Numeric 0) Then DIFU 1000 = ON AND DM0000 = 0
b.If 0001 = ON (Numeric 1) Then DIFU 1000 = ON AND DM0000 = 1
c.If 0002 = ON (Numeric 2) Then DIFU 1000 = ON AND DM0000 = 2
d.If 0003 = ON (Numeric 3) Then DIFU 1000 = ON AND DM0000 = 3
e.If 0004 = ON (Numeric 4) Then DIFU 1000 = ON AND DM0000 = 4
f.If 0005 = ON (Numeric 5) Then DIFU 1000 = ON AND DM0000 = 5
g.If 0006 = ON (Numeric 6) Then DIFU 1000 = ON AND DM0000 = 6
h.If 0007 = ON (Numeric 7) Then DIFU 1000 = ON AND DM0000 = 7
i.If 0008 = ON (Numeric 8) Then DIFU 1000 = ON AND DM0000 = 8
j.If 0009 = ON (Numeric 9) Then DIFU 1000 = ON AND DM0000 = 9
Note : DIFU = Single-scan of target relay ON at rising edge of previous state

Step 3 :
Count the number keypad is pressed
Using DM0030 for Count data storage
a.If 1000 = ON Then INC DM0030 (Increment target device value)

Step 4 :
Enter Released for Value DM0030 = 0 (Count data RESET)
a.If 0010 = ON (ENTER key is pressed) Then DIFD 1001 = ON (Single-scan of target relay ON at falling edge of previous state)
b.If 1001 = ON Then Value DM0030 = 0

Step 5 :
Password from the KeyPad
Using DM0012 for Password from the KeyPad
a.Keypad is pressed first, multiplied by 1000
(1000 = ON) AND (LDA DM0030) AND (CMP#0001) AND (2010) AND (LDA DM0000) AND (MUL #01000) AND (STA DM0001)
b.Keypad is pressed second, multiplied by 100
(1000 = ON) AND (LDA DM0030) AND (CMP#0002) AND (2010) AND (LDA DM0000) AND (MUL #00100) AND (STA DM0002)
c.Keypad is pressed three, multiplied by 10
(1000 = ON) AND (LDA DM0030) AND (CMP#0003) AND (2010) AND (LDA DM0000) AND (MUL #00010) AND (STA DM0003)
d.Keypad is pressed four, multiplied by 1
(1000 = ON) AND (LDA DM0030) AND (CMP#0004) AND (2010) AND (LDA DM0000) AND (MUL #00001) AND (STA DM0004)
e.Sum all the data
(1000 = ON) AND (LDA DM0001) AND (ADD DM0002) AND (STA DM0010)
(1000 = ON) AND (LDA DM0010) AND (ADD DM0003) AND (STA DM0011)
(1000 = ON) AND (LDA DM0011) AND (ADD DM0004) AND (STA DM0012)

Example :
Keypad is pressed :
first : Numeric 9 => 9 multiplied by 1000 = 9000
second : Numeric 6 => 6 multiplied by 100 = 600
three : Numeric 5 => 5 multiplied by 10 = 50
four : Numeric 7 => 7 multiplied by 1 = 7
Sum all the data = 9000 + 600 + 50 + 7 = 9657
So,Password from the keypad is 9657

Step 6 :
Check the number of digits
a.If DM0030 = 4 (4 times the keypad is pressed) Then 1002 = ON

Step 7 :
Correct Password
a.If 0010 = ON (ENTER key is pressed) AND 1002 = ON AND Value(DM0012 = DM0020) Then SET 1003 = ON
b.If 1003 = ON Then 0500 = ON (Correct Lamp)

Step 8 :
Wrong Password and Not 4 digits
a.If 0010 = ON (ENTER key is pressed) AND 1002 = ON AND Value(DM0012 not same DM0020) Then SET 1004 = ON
b.If 0010 = ON (ENTER key is pressed) AND 1002 = OFF AND 1003 = OFF AND 1004 = OFF Then SET 1005 = ON (Not 4 digits)
c.If 1004 = ON OR 1005 = ON Then 0501 = ON (Wrong Lamp)

Step 9 :
Green Light = OFF OR Red Light = OFF
a.If 1000 = ON AND 1003 = ON OR 1004 = ON OR 1005 = ON Then RES 1003 (1003 = OFF) AND RES 1004 (1004 = OFF) AND RES 1005 (1005 = OFF)

Please Download Programming for KV Builder :
Password Using PLC Keyence

See : Password PLC


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