Programmable Controllers: Theory and Implementation

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Introduction to PLC Programming and Implementation—from relay logic to PLC logic–Analog Output+Analog OutputManualSpeedManualAutoTB-112Adjust+12 VTo Speed RegulatorReverseContactOutputForwardManualAuto34ForwardCommon (Controller)ManualAuto5ReverseChassisGround115 VACOutputL1 OutStartAutoManualRun67CR1CR1StopJog8Spare115VACOLOL9SpareOLField10DriveFigure 42. VS drive with AUTO/MAN capability.the start, stop, run/jog, potentiometer, and forward/reverse field devicesshown are from the operator station. These devices are connected to the PLCinterface under the same names that are used in the control program (refer toFigure 41). If the AUTO/MAN switch is set to automatic, the PLC willcontrol the drive; if the switch is set to manual, the manual station willcontrol the drive.CONTINUOUS BOTTLE-FILLING CONTROLIn this example (see Figure 43), we will implement a control program thatdetects the position of a bottle via a limit switch, waits 0.5 seconds, and thenfills the bottle until a photosensor detects a filled condition. After the bottleis filled, the control program will wait 0.7 seconds before moving to the nextbottle. The program will include start and stop circuits for the outfeed motorand the start of the process. Table 17 shows the I/O address assignment, whileTables 18 and 19 present the internal and register assignments, respectively.These assignments include the start and stop process signals.Industrial Text & Video Company www.industrialtext.com 1-800-752-839844
Introduction to PLC Programming and Implementation—from relay logic to PLC logicFluidSolenoid Operated ControlPhotoeye DetectorPerpendicular To BottleFilled BottlesLSFixedRollersLimit SwitchFeed MotorDriveM1Outfeed Motor Drive(Always ON During Process)M2Figure 43. Bottle-filling system.I/O AddressModuleTypeRackGroupTerminalDescriptionInput0 0 0 Start process PB10 0 1 Stop process PB2 (NC)0 0 2 Limit switch (position detect)0 0 3 Photoeye (level detect)Output0 3 0 Feed motor M10 3 1 Outfeed motor M2 (system ON)0 3 2 Solenoid control0 3 3 —Table 17. I/O address assignment.DeviceInternalDescriptionTimer1001Timer for 0.5 sec delay after position detectTimer1002Timer for 0.7 sec delay after level detect— 1003Bottle filled, timed out, feed motor M1Table 18. Internal output assignment.RegisterDescription4000Preset value 5, time base 0.1 sec (1001)4001Accumulated value for 10014002Preset value 7, time base 0.1 sec (1002)4003Accumulated value for 1002Table 19. Register assignment.Industrial Text & Video Company www.industrialtext.com 1-800-752-839845
Page 2 and 3: A Special Note ToOur CustomersHere
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