Device Auto Switch Manual Forward Sw Switch (SW1) Stop Switch (SW2) Reverse Sw Switch (SW3) Limit Switch (LS1) Limit Switch (LS2) Auto Start Bu Button (PBS)
Output 1000 1001 1002 1003 1004
Device Auto Indicator Manual Indicator Motor Forward Motor Reverse Auto Start Indicator
Procedure 1. Manu Manual al Op Oper erat atio ion n 1.1 When SW1 is ON, Motor moves forward. forward. It can be stopped by SW2. When the drill touches LS2, the Motor is cut-off. 1.2 When SW3 is ON, Motor moves in reverse. reverse. It can be stopped by SW2. When he drill touches LS1, the Motor is cut-off. 2. Auto Auto-c -cyc ycle le 2.1 When PB and LS1 is ON, the Motor moves forward until LS2 is activated. activated. The Timer then starts timing down. The Motor reverses when the timer reaches 2 seconds. When it returns to LS1 position, the cycle is repeated.
6-30
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6.
APPLICATION EXAMPLES OF BASIC COMMANDS
Answer Ladder diagram : Main 1 Network 1 Main 1 – Drilling Control Drilling control operation Network 1 – Manual indication 010.01 000.01 Manual
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6.
APPLICATION EXAMPLES OF BASIC COMMANDS
Network 8 – Motor reverse TIM000
005.11
Delay
Motorrevers
Network 9 – Motor forward 005.09
010.02
Motorforw
Motorforw
005.06 Motorforw Network 10 – Motor reverse 005.11
010.03
Motorreverse
Motorreversee
005.07 Rev Network 11 – Autostart Autostart indicator 005.08 Autostart Network 12 – End END (01)
010.04
Autostirtindi
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6.
APPLICATION EXAMPLES OF BASIC COMMANDS KEEP is used as a latch. It maintains an ON or OFF state of a bit until one of its two inputs sets or resets it. If the KEEP function is used together with a HR relay, the state of the latched output is retained even during a power failure. Ladder diagram 00000
KEEP(11 ) 10000
00001
Mnemonic codes Addre Instructio ss n 0000 LD 0001 LD 0002 KEEP(11) 0003 END(01)
Data 00000 00001 10000
END(01)
DIFU(13) and DIFD(14) – Differentiation DIFU and DIFD turns an output ON for one scan only. DIFU turns its output ON when it detects an OFF -> ON transistion in its input signal. DIFD turns its output ON when it detects an ON -> OFF transistion in its input signal.
Input
DIFU
DIFD
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6.
APPLICATION EXAMPLES OF BASIC COMMANDS
Application #5: Filling/Draining Control Operation Control Panel
MV 1
PB1 (0) START TLB1 (5)
PB2 (1) STOP
PB3 (2)
TLB2 (6)
RESET
MV 2
PL (100 4) END
M BZ (100 5) BUZZER •
I/O Assignments Input 00000
Device Start Button (PB1)
Output 01000
00001 00002 0000 00 005 5
Stop Button (PB2) Reset Button (PB3) Uppe Upperr Lev Level el Swit Switch ch (TLB1) Lowe Lowerr Lev Level el Swit Switch ch (TLB2)
01001 01002 01004
Device Water Supply Valve (MV1) Drain Valve (MV2) Stirring Motor (M) End Indicator
01005
Buzzer
0000 00 006 6
•
Procedure 1. As the PB1 is pressed, MV1 opens and the water begins to fill the tank. At the same time, the stirring motor M starts operations. 2 When the water level passes TLB2 and reaches TLB1 the
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6.
APPLICATION EXAMPLES OF BASIC COMMANDS 4. When the cycle of operation has repeated four times, the operation END indicator illuminates, and the filling and draining operation will not restart even if PB1 is pressed.
Ladder diagram : Main 1 Network 1 Main 1 – Fill / Draining Filling / Draining control operation Network 1 – Start condition 010.05 000.00 start 010.00
#0004 Reset Network 9 – End indication CNT047 010.04 Counter
PL
Network 10 – Delay Delay for 2 seconds 010.04 TIM PL
000 #0020
Network 11 – Buzzer CNT047 Counter Network 12 – End END (01)
TIM000
010.05
BZ
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6.
APPLICATION EXAMPLES OF BASIC COMMANDS Shift Register – SFT(10) Shift Register (SFT) shifts a 16-bit data in specified channel by 1 bit. Although this instruction shifts data within channels, both a start channel and an end channel must be specified as the data.
Ladder diagram IN CP
Operand Data Areas SFT(10)
I/O, Internal auxiliary Relay
S
R
Holding Relay
E
Start CH 00 01 02 15
00 01 02 15
End CH 00 01 02 15
Example circuit Ladder Diagram 0000 2 0000 4 0000 5
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6.
APPLICATION EXAMPLES OF BASIC COMMANDS
Application #6: Overhead Crane Control of Degreasing Operation In this applicat application, ion, the part needs to be degreased degreased in the degreasing degreasing tank before being passed to the next section.
(S5 ) 6
Left (1001)
Right (1003)
(S4 ) 5
(S1 ) 2
Roller Up (1000) Up Sensor (S3) 4 Down Sensor (S2) 3 PB1 (Start) (0)
Rese t
PB2 (1)
Buzze r (1004 )
Operat or
Down (1002) (07)
Degreasing Tanks
Operat or
Stop Button (8)
When the PB1 is pressed, the roller will coil up the hook until the up-sensor (S3). The hook will then transverse left (via 01001) until it reaches the S4
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6.
APPLICATION EXAMPLES OF BASIC COMMANDS
At anytim anytime, e, the Stop Pus Push h Button Button can stop stop the crane crane from from moving moving.. Upon Upon release, it will continue from where it stops. The Reset Push Button is used when you want to start over again from the beginning.
