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6. APPLICATION EXAMPLES OF BASIC COMMANDS

When all the PCBs have been pushed onto the conveyor belt, the lifter motor will move down until thelimit switch (LSW) is being activated !hereafter, the whole procedure can only be started by the startswitch

I/O Assignment

Input Device Output Device

""""" Start PushButton

"#""" Conveyormotor

""""# Stop PushButton

"#""# $p Lifter motor

""""% &S# (Left Limit) "#""% &ight piston""""' &S% (&ight

Limit)"#""' Left piston

"""" ProimitySwitch

"#"" *own liftermotor

""""+ &eset"""" Limit Switch

-+"

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6. APPLICATION EXAMPLES OF BASIC COMMANDS

Ladder diagram . /ain # 0etwor1 #

/ain# 2PCB pac1ing conveyor program utilising (Conventional method)

0etwor1 # 2Start 3 Stop control

0etwor1 % 2 Left limitLeft limit reached for piston

0etwor1 ' 2 Lifter upLifter motor up

0etwor1 2 4nde switchProimity switch detect the net inde of PCB

0etwor1 + 2 Lifter upLift the PCB up one after another

0etwor1 2 Pistonright

-+#

StopStart

Conveyor

Conveyor

""""" """"# C0!""#

"#"""

*45$(#')

%""""

"#""" """"

LSWConveyor

Lifterstop

$p

$p

%"""" %"""% C0!""#

"#""#

"#""#

%"""'

*45$(#')

%"""#

""""

Proimitysw

!4/

"""delay

6""#"

%"""# "#""% %"""%

%"""%

Lifterstop

&ight Lifterstop

*elay &ight

""""% !4/""" """"'

"#""%

"#""%

&S%(&478!L4/4!)&S#(L95!:L4/4!)

&ight

"#"""

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6. APPLICATION EXAMPLES OF BASIC COMMANDS

Ladder *iagram . /ain # 0etwor1 #

/ain # 2 S5! (#") methodPCB pac1ing conveyor program utilising (shift register method)

0etwor1 # 2 Conveyor

0etwor1 % 2 Set bit

0etwor1 ' 2 Set #st bitSet first bit of 8& "" on

0etwor1 2 Shift register

0etwor1 + 2 Cloc1Cloc1 input to shift register to control se>uence of operations

0etwor1 2 CounterCounter preset at %"

-+'

LimitswitchConveyor

""""" """" """"%

"#"""

"#"""

Start

Conveyor

Stop

""""#

&S#

*45$(#')

%""""

"#"""

Conveyor

/?@(%#)

6"""#

8&""

%"""" C0!""#

8&"""'

%+'#

%"""#

8&"""+

S5!(#")

8&""

8&""

8&"""" """"

Proimitysw

8&"""# """"'

&S%

8&"""% """"%

&S#

8&"""' C0!""#

8&""" """"

Limitswitch

%"""# %"""#

8&"""%

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6. APPLICATION EXAMPLES OF BASIC COMMANDS

0etwor1 ; 2 Lifter up

0etwor1 < 2 Piston right

0etwor1 = 2 Piston left

0etwor1 #" 2Lifter down

0etwor1 ## 2 9nd

Applicti!n "#$% Aut!mtic C!nt&!l O' (&e)!use D!!&

-+

""""+

C0!

""#

6""%"&eset

C0!""#

8&"""" "#""#

Lifterup

8&"""# "#""%

Pistonright

8&"""% "#""'

Pistonleft

8&""" "#""

Lifterdown

9nd ("#)

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6. APPLICATION EXAMPLES OF BASIC COMMANDS

!he input ultrasonic switch is employed to detect the presence of anapproaching vehicle A separate photosensor detects the passing of a vehicle viathe interruption of the light beam 4n response to these signals, the controlcircuit controls the outputs that drive the motor of the door for opening andclosing

I/O Assignment

Input Devices Output Devices

""""" $ltrasonic switch "#""" /otor to raisedoor

""""# Photoelectric switch "#""# /otor to lowerdoor

""""% *oor upper limitswitch

""""' *oor lower limitswitch

-++

*oorposition/otor

$ltrasonic

Pushbutton

Switch

PhotoelectricSwitch

CP/%A

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6. APPLICATION EXAMPLES OF BASIC COMMANDS

Ladder diagram . /ain # 0etwor1 #

/ain # 2 Autodoor!his program shows the automatic control of warehouse door

0etwor1 # 2 &aise door

0etwor1 % 2 PhotosensorSense until differentiation down

0etwor1 ' 2 Lower door

0etwor1 2 9nd

-+

$pperLS &aisedoor

""""" """"% "#""#

"#"""

"#"""

$ltraswitch

&aisedoor

Lowerdoor

""""#

*45*(#)

%""""

Photosensor

LowerLS Lowerdoor

%"""" """"' "#"""

"#""#

"#""#

Lowerdoor

&aisedoor

9nd ("#)

Timing*ig&m

""""" $ltrasonicswitch

""""% $pper limitswitch

#"""" /otor to raisedoor

""""# Photoelectricswitch

"""" *45*

""""' Lower limitswitch

#"""# /otor to lowerdoor

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6. APPLICATION EXAMPLES OF BASIC COMMANDS

Applicti!n "##% Aut!mtic Lu+&icti!n !' ,e&

When the gear is moved towards S#, the sensor S# will detect the gear andsignal the electromagnetic valve for oil supply on the gear !he valve (@#) willopen for a short period of time, supplying a predetermined >uantity of oil Whensensor S% sense that the lubricating tan1 oil level is low, the oil shortage alarm

indicator will be ?0

I/O Assignment

Input Devices Output

Devices

""""" Position detection(S#)

"#""" 9lectromagnetic valve for oilsupply (@#)

""""# Lower limit of oil

(S%)

"#""# ?il shortage alarm indicator

-+;

S% (#)

@#(#""")

Lubricating ?il

!an1

?ilshortagealarmindicator

S

#

(")

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6. APPLICATION EXAMPLES OF BASIC COMMANDS

Ladder *iagram . /ain # 0etwor1 #

/ain # 2 Auto lubricateAuto lubricate of gear

0etwor1 # 2 Start

0etwor1 % 2 ?pen valve?pen valve and delay #+ sec

0etwor1 ' 2 ?il shortage

0etwor1 2 9nd

-+