PROGRAMMABLE LIMIT SWITCHES (PLS)
PROGRAMMABLE LIMIT SWITCHES (PLS)SECTION D — PROGRAMMABLE LIMIT SWITCHES (PLS)Programmable Limit Switch, "The Solid-State Programmable Cam Switch" . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-2Stand alone PLS:Touch PLS, Touchscreen PLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-7M1020 PLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-13M1050 PLS Series — M1050, M1050A, M1051, M1051-R10, M1052, & M1053 . . . . . . . . . . . . . . . . . . . . . . . . . . .D-16M1151 The Incredibly Small PLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-21M1250 Mini PLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-24M1450 Mini PLS with Advanced Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-24M1500 Pc PLS combination PLC and PLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-32M1350 Mini Cam Rotary Cam Switch — Optical Noncontacting Limit Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-40M1920 PLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-43PLC/PC Backplane Mounted PLS:SECTIONDM1750 PLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-35M8250 Series PLS BusModules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-47PC (ISA-Bus) PLS BusModule . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-50Programmable Limit Switches800-TEC-ENGRwww.avg.netD-1
PROGRAMMABLE LIMIT SWITCH"THE SOLID-STATE PROGRAMMABLE CAM SWITCH"A HISTORICAL PERSPECTIVEMany machines used in automated manufacturing environments in the early 1970's had rotary cam switches or limitswitches to sense machine position and used hard-wired relaycontrol panels to control machine operation. Even the smallestchange in machine control logic required extensive work tomodify the relay control panel. New control development wasvery inefficient since each control logic required custom-builthardware. Further, adjusting a machine's cam settings for anew set-up required many hours or even days of machinedown-time.The mid 70's saw the development of new controls to solvethese problems. Programmable Logic Controllers (PLCs) weredeveloped to replace the relay control panels and AVGAutomation invented an electronic Programmable LimitD-2800-TEC-ENGRwww.avg.netSwitch (PLS) to replace the mechanical, cam tripped, limitswitches. The PLS consists of an absolute-position transducer,mounted in place of the rotary cam limit switch, and programmable electronics mounted in the control panel. With theadvent of the PLS, cam settings can be altered in minutesinstead of hours. Also, cam settings can be optimized by finetuning while a machine is in operation.The PLS and PLC combination has been so successfullyemployed in factory automation that it is now standard formany kinds of machines. The PLS, because of its speed andaccuracy, controls high-speed machine operations with precision and can provide the PLC accurate timing, position, orRPM data. The PLC controls slower machine functions andprovides overall machine control.Programmable Limit Switches
1. Synchronization of rapidly changing position data to theinput scan of a PLC.2. Slow scan time of a PLC.The lack of synchronization may result in misreading of theposition information occasionally. AVG Automation solvedsynchronization problems for PLC users by inventing the PCHandshake module in 1978. An external PC-HandshakeModule, however, negated the concept of "one control box".Even though PLCs have been getting faster and faster, it isinconceivable for a PLC to be able to handle the desired position transducer data rates. For example, even a 5-ms scan timeallows a top speed of only 33 rpm for 1 resolution.In the early 1980's the state of the art in machine control wasa combination of a PLS for high-speed response and ease ofset-up and a PLC for control logic and intelligent networking.It was in the beginning of 1987 when the MacroPLS fromAVG Automation with its revolutionary system architectureand technology made the industry's desire for "one controlbox" a reality. The MacroPLS is the first PLS with ladder logicand a math instruction set. With direct high-speed resolverinterface and 3K of relay ladder logic repeatable to 100 µs, theMacroPLS was a giant leap into the future.Programmable Limit SwitchesPrinciple of OperationA PLS system consists of a position transducer mounted on amachine's drive shaft and a programmable unit mounted inthe machine control panel. In AVG Automation's case, theposition transducer is a resolver, which produces analog signalsproportional to the shaft position. The position signals areconverted to digital format by an internal ratiometric trackingconverter in the programmable unit, displayed on the frontpanel and compared to the dwell setpoints programmed intothe PLS. When the process cycle reaches these setpoints, outputs are turned ON or OFF, to start or stop desired functionsduring the cycle.The cam limits or dwells are programmed into the PLS bythumbwheel settings or simple keyboard entries right from thecontrol panel. No more climbing to the top of the press tomake cam adjustments which were not only tedious but alsovery time consuming. Furthermore, with the PLSs, the finetuning can be done on the fly.PLSs today offer many advanced features such as zero offsetadjustment, dynamic zeroing and programmable rate offset.Zero offset feature allows the operation an easy way of aligningresolver zero to the machine zero. Dynamic zeroing and ModZallows modification of the zero reference for selected channelsindependent of the actual resolver position. Programmable rateoffset, ROF, allows automatic adjustment of set points to compensate for machine speed variations.SECTIONDSince the mid to late 70's, autom0ation control users havedesired to combine the PLS and the PLC into one control.Interfacing absolute-position encoders/resolvers directly toPLCs has been widely attempted with limited success. The twoobstacles to using PLCs for the PLS function are:The AVG Automation microprocessor-based PLSs uses apatented DMA technique employing look-up tables to achievethe fastest machine operation in the industry: 20,000 setpointsin 85 µs.800-TEC-ENGRwww.avg.netD-3
Position Transducers:1. ResolverA resolver is a passive position transducer. It works on theprinciple of a rotary transformer and consists of one rotorwinding and two stator windings located 90 apart. The rotorwinding is excited with a voltage Vr. As the shaft rotates, theoutput voltage of the stator windings varies as the sine andcosine of the shaft angle.2. Ultrasonic Linear TransducerAn Ultrasonic Linear Transducer provides a means of accurately measuring linear distance ultrasonically with a minimum ofmechanical linkages and extra hardware. There are no movingparts and consequently no wear.An ultrasonic linear transducer consists of an interface controlmodule, a transducer rod and a "doughnut-shaped" magnet.An electrical interrogation pulse, generated in the interfacecontrol module, starts the leading edge of the pulse-widthmodulation signal. This pulse creates a magnetic field aroundthe conducting element housed inside a magnetorestrictivetube called waveguide. The waveguide, in turn, is enclosed inthe nonmagnetic stainless steel tube. The magnetic field fromthe "doughnut-shaped" permanent magnet, mechanically representative of machine position, reacts with this generated fieldproducing a mechanical force at right angles to the conductingelement. This force causes a twist (torsional strain) whichslightly twists the waveguide tube. The twist in the tube produces a torsion wave that is transmitted along the waveguide.The time delay from the interrogating pulse until the travelling torsion wave produces a signal in the sensing coil is adirect measurement of the linear position of the "doughnut"magnet. The precise time interval is then converted to digitalposition inside a linear decoder or a linear PLS.Magnetic fields normally generated by 60 or 400 Hz equipment will not affect the operation because these frequencieswill be rejected by the narrow bandwidth detection used.Normally, the transducer beam is fixed and the "doughnut"magnet moves with the moving part of the machine. However,the two can be reversed if desired. The relative displacementbetween the magnet and rod provides the linear position.The ratio of the secondary stator voltages:Note that the angle Ø is no longer a function of the inducedabsolute Vr, but rather the ratio of Vs1 and Vs2. Therefore,variations in the rotor voltage Vr, frequency and temperatureare no longer factors in ratiometric output signal Vs1/Vs2. Thisresults in a highly accurate and repeatable resolver decoder.D-4800-TEC-ENGRwww.avg.netProgrammable Limit Switches
Advanages of AVG Automation PLS over Competitive PLSs:FeaturesAVG Automation PLSsOther PLSs1. Number of outputsUp to 80 outputs in 6" x 4" x 6".Field-expandable to 560 outputs byadding slave units6-48 outputs; factory ordered;large overall size2. Setpoints per channel80 to no limit on 3-digit models;4- and 6-digit models have 21setpoints per channelOnly 1 setpoint per channel on mostmodels; some models offer limitedmultiple setpoints, such as 12 setpointsper 6 channels3. Response timeFastest PLS in the market; patentedDMA technique allows processing20,000 setpoints in 85 µsScan time of a few ms; Some claim µsscan time but in reality operate as timebased rather than position-based4. Fine-tuning in motionYes; adjust setpoints in full motionFor most of PLSs machine shutdownrequired to change setpoints5. Autozero offsetYes, allows quick, automaticmatching of machine zero withresolver zeroAmount of offset required for machinezero alignment needs calculation6. Write protect on memoryYesNone7. Slave unitsConnected to high-noise-immuneresolver inputConnected to the noise-susceptible BCDoutput from the master PLS.8. Position output forexternal devicesField add-on modules for analog orMust be factory ordered; limited to BCDBCD, Binary, or Gray code; built-in PCoutput only; no PC-handshake.handshakeField add-on module for analog ordigital tachNoneBuilt-in or field add-on accessorydepending on modelNot available on most models; Someunits have factory ordered optionPlug-in modules or a separatechassisSeparate chassis onlyNonemodulesPortable EEPROM memory modulesallow a preprogrammed modulelibrary for multiple program selection13. Resolver connectionsAbuse-proof resolver connections;short- circuit-proofNot short-circuit-proof9. Tach output10. Broken resolver wiredetector11. Optically isolatedoutputs12. Portable programSECTIONDAdvantages of AVG Automation PLSs over Competitive PLSs14. KeyboardUp to 100 programs of160 dual-limitsSome models offer maximum ofper-channel. May be remotelyprograms of a very limited number ofprogrammable and remoteselected by PLCs, computers,setpoints. Not necessarily PLC-selectableor BCD switchesPLS program selectionProgrammable Limit Switches800-TEC-ENGRwww.avg.netD-5
Advanages of a PLS over Mechanical Limit Swithces:Advantages of a PLS over Mechanical Limit SwitchesD-6FeatureMechanical SwitchesProgrammable Limit switch (PLS)1. Accuracy5 at best; degrades with time0.1 repeatable to arc minutes;does not degrade with time2. SetupVery cumbersome andtime consumingVery simple and accurate limit settingswith keypad or thumbwheel switches3. AccessibilityOften mounted in inaccessiblelocationsMounted on control panelor in control room4. Speed100 rpm max; above thisspeed contacts bounceand accuracy is lostUp to 1800 rpm with 1 resolution5. Life ExpectancyConstant cycling and wear oncams as well as switch contactsreduce operational lifeVery reliable; Resolver shaftis the only moving part6. Dwell RangeMinimum 3 to 5 dwell settingsDwell settings as low as 0.10 7. Need for AdjustmentOften requires adjustmentbecause of mechanical wearOnce set never needs adjustment8. Adjustment duringmachine operationNot possible; must stopmachine to adjust camsSetpoints can be fine-tunedwith machine in operation9. Position displayNo display availableDigital shaft position display is extremelyuseful for set-up and service personnel10. Speed CompensationNot availableWith varying speed, limits advanceautomatically by preprogrammed amount11. Mod-Z: Modification ZeroNot availableWith an external signal, position referencefor a group of PLS output channels is resetto zero while other channels maintainmachine position reference12. Output OptionsOnly electromechanical switchesOptions of EM relays, solid-stateAC or DC relays or logic level outputscompatible with PLCs13. CostLow initial costHigher initial cost, but lower operationalcost due to less down-time and increasedproductivity. Can pay for itself in days14. Field ExpandableNot possible; must use anew model for highernumber of outputsModular construction; easilyfield-expandableby adding more modules15. Program securityNoneKey-switch lock out againstunauthorized program tampering16. Speed displayNot availableBuilt in tachometer displays shaft RPM17. Motion DetectorNot availableBuilt in motion detector monitors machimeover or under speed problems800-TEC-ENGRwww.avg.netProgrammable Limit Switches
TOUCH PLS— TOUCHSCREEN PLSA NEW HORIZON IN PROGRAMMABLE LIMIT SWITCHES Touchscreen PLS and Graphical Operator Interfacein One Unit Five Screen Sizes Available: 5" Color,6" Monochrome, 8" Color, 9" Monochrome EL,and 10" Color Most-Advanced PLS with Leading- and Trailing-Edge Speed Compensation PLS Settings and Machine Data Totally Integratedwith Your PLC Programmable Graphical Interface to Over 30Models of PLCs 32 PLS Programs 8 levels of security Brake-wear Monitor Built-in Motion Detector and Tachometer Angle ON/Angle OFF and Angle/ON/Time OFF Broken wire detection Short-Circuit-Proof Resolver Self DiagnosticsSECTIOND Dynamic zeroing upon external command Optically Isolated Inputs & OutputsTOUCH PLSTouch PLS is a traditional PLS that's been combined with atouchscreen-based Graphical Operator Interface. No longer doyou have to contend with LEDs, switches, pushbuttons, andkeypads. Touch PLS graphically depicts your application,while providing machine settings and status and productiondata. All programming and fine-tuning of the PLS settingsoccurs in a Windows-type environment. While the unit comeswith predesigned screens, AVG Automation's µWIN softwaremakes it easy to create or customize screens to suit your particular application.One size fits all!You don't need separate PLS and PLC operator interfaceswhen you use Touch PLS because it does double duty; servingas a PLS interface/control as well as an operator interface tothe PLC. There's no need to clutter up your machine's operator panel with several different displays when Touch PLS doesit all! It reduces panel space, which also reduces installationcosts and hardware costs.Programmable Limit SwitchesTouch PLS Principle of OperationThe Touch PLS, as shown in the block diagram, uses twoprocessors, one for the PLS and the other to manage, display,and communicate to the PLC. The PLS processor reads itsposition signals from the resolver mounted on the machine'sshaft. It controls position-based outputs independent of theinterface processor, providing fast repeatable outputs. The PLSprocessor and the interface processor share information using a1,024-register shared memory. The dynamic information, suchas position, RPM, and output status, is available to the interface processor for display through registers.The interface processor also shares data with the connectedPLC through a second set of 1,024 registers. This arrangementmakes it easy to display data from both the PLC and PLS onone screen. In addition, 32 registers (16 in each direction) areused to exchange time-critical information between the PLSand PLC through the interface processor. These registers canbe used to send position, RPM, and output status informationto the PLC.800-TEC-ENGRwww.avg.netD-7
pressing a button on a touch screen to select the program corresponding to the job. Remote selection of PLS programs mayalso be accomplished by a PLC.Leading- and Trailing-Edge SpeedCompensationTouch PLS features a Speed Compensation (Rate Offset) tocompensate for speed variations. The Rate Offset, individuallyprogrammable for each channel, is used to advance the PLSsettings as a function of the machine speedPulse ProgrammingTouch PLS can be fine-tuned while your machine is running.Either or both of the ON and OFF Setpoints can be incremented or decremented, or a fixed dwell can be incrementedor decremented, as needed.Rugged, Reliable Resolver for PositionTransducerThe Touch PLS uses a resolver as a position transducer. Unlikeincremental encoders, the resolver, along with its noiseimmune ratiometric converter, always gives true machine position—even if the machine moved during a power outage. Theresolver, due to its construction, is immune to temperatureand humidity extremes and mechanical shocks and vibrations.Short-Circuit-Proof ResolverThe Touch PLS uses AVG Automation's standard short-circuit-proof resolver circuit. Thus, in case of an accidental shortin the resolver wiring, costly damage to the PLS resolverdecoder and the resulting downtime is avoided.Broken-Wire DetectionThe Touch PLS features a broken resolver-wire detector tosupervise the resolver input signal. The broken-wire detectorwill signal the fault output if the resolver is missing any signals.Touch PLS can be programmed to have its outputs turned ONat an angle and turned OFF after a programmed time by touching the screen. For example, Channel 12 can be turned ON atan angle of 100 and stay ON for a period of 2.45 seconds.Programmable Functionality: Brake and ModZTouch PLS features a dynamic zeroing or ModZ(Modification Zero) to modify the zero reference point, independent of the actual resolver position. After the PLS receivesthe ModZ input, the resolver position is reset to zero.Touch PLS can also perform Brake Monitoring to satisfy theOSHA requirement. This PLS can be field-programmed tohave Brake Monitoring Functionality (initiated by entering aCaution and Danger limit). If you do not select BrakeMonitoring, the user must select ModZ or the unit defaults tonormal PLS functionality. (If Brake Monitoring is selected, theunit cannot function as ModZ.)Flexible Group AssignmentFEATURES:Touch PLS uses AVG Automation's patented DMA technique,which converts the resolver's analog output signal to a digitalform, then compares all the setpoints, and activates all the outputs in less than a millisecond. The high-speed ratiometricresolver-to-digital converter and the microscan time guaranteesperfect machine operation at speeds up to 1,800 RPM.Touch PLS's Flexible Group Assignment can be a powerfuland useful feature. When it is desirable to control several different machines linked to the same drive shaft, output channels may be grouped together into one of five independentsections. The base group is always PLS, while the other fourgroups (1-4) may be defined as PLS or ModZ type. Each PLSgroup has its own group offset, while each ModZ group has itsown ModZ inhibit zone.Multiple Program StorageBuilt-in Motion Detector and TachometerThe Touch PLS can internally store 32 independent programsfor different jobs. With a pre-programmed Touch PLS for different product runs, the product change over is as simple asTouch PLS has a built-in tachometer and motion detector.The motion detector energizes a relay when the RPM isbetween the programmed LOW and HIGH alarm values.Highest Processing SpeedD-8Angle ON/Time OFF800-TEC-ENGRwww.avg.netProgrammable Limit Switches
8-Levels of Password ProtectionTouch PLS has a password protection feature eight levels deep.Up to eight different passwords that are user-programmablefrom the touchscreen, allow access to different screens in theTouch PLS, providing ultimate protection and security ofmachine settings.8" ColorThe 8" color model provides 640 x 480-pixel resolution with16 colors and a 16 x12 touch-cell grid.Touch PLS has Choice Of 6 DisplaysTouch PLS offers four different types of flat panel touchscreendisplays to suit any application and its budget. Except for thesize and availability of colors on the screen, all other featuresremain the same.5" ColorThe 5" active matrix color LCD model offers 16 bright colors,high-contrast, 320 x 240-pixel resolution, and an 8 x 6 touchcell grid.6" MonochromeThe 6" monochrome model provides 320 x 240-pixel resolution with three shades of gray and an 8 x 6 touch-cell grid.Programmable Limit Switches9" Monochrome ELThe 9" monochrome electroluminescent model provides 640 x400-pixel resolution with three shades of amber and an 16 x10 touch-cell grid.SECTIOND5" ColorThe 5" color LCD model offers 16 colors, high-contrast, 320x 240-pixel resolution, and an 8 x 6 touch-cell grid.10" ColorThe 10" color model comes with a bright 640 x 480-pixel resolution, 16-color, flat panel display, and 16 x 12 touch-cell grid.800-TEC-ENGRwww.avg.netD-9
Touch PLS-Total Integration With any PLCNetworkUntil the advent of Touch PLS, the only way you communicated machine position, speed, or PLS status to your PLC network, was through hard-wired discrete outputs from the PLSto the PLC inputs. As far as the PLS program settings wereconcerned, they were simply not available to the PLC.Touch PLS can communicates to more than 30 different PLCsand their networks, or through a serial connection, such as AB DH , A-B Remote I/O, or Profibus. The entire PLS program can be either uploaded or downloaded to the PLCthrough the same bus connection. Hard PLS outputs are alsoavailable to activate the machine solenoids directly—freeingthe PLC's CPU from this task.Touch PLS Eliminates the Need for a SeparateOperator Interface for Your PLCTouch PLS is a complete Graphical Operator Interface for usewith the PLC in your system. Therefore, you do not need another OI for the PLC if you are using Touch PLS. It can communicate to your PLC, even while performing PLS functions.The OI part of Touch PLS is more than a pushbutton replacement. It offers functionality not possible with other discreteoperator panels. Not only can it replace common panel components, such as pushbuttons, pilot lights, selector switches, etc.very economically, but you also have complex flexibility. WithTouch PLS, your control panel is never obsolete. Any changescan be made in minutes on-line, off-line, or even remotely.D-10800-TEC-ENGRwww.avg.netµWIN: The Windows-Based On-Line Softwareto Program PLC Screens and Customize PLSScreensTouch PLS is shipped with preprogrammed screens for PLSoperation. However, with AVG Automation's µWIN software,a user can modify or customize the screens to his or her imagination.The µWIN software works with Microsoft Windows 3.11 orlater. In addition to supporting advanced features like CADdrawing capability, library support, etc., µWIN offers a toolbox of commonly used panel components. The tool box helpscreate simple operator panels quickly without drawing.A library of several components are available on AVGAutomation's web site to save valuable drawing time.With µWIN, the user can develop screens off- or on-line.With the off-line feature, the screens can be developed in theconvenience of your office or remotely, and then downloadedto the unit.With the on-line programming feature, you can develop thescreens while the Touch PLS is operating and communicatingto the PLC. This allows modifying screens without taking theTouch PLS off line. The program development can be donethrough a modem, allowing you to change the program on aTouch PLS virtually anywhere in the world.Programmable Limit Switches
The operator can't push the wrong buttonMultiple Language DisplaysTouch PLS panels display only the necessary controls that areneeded for a particular function, and only when they are needed. Thus, not only can the machine's control panel be madefar less cluttered; but, controls that are not needed at thatmoment are simply not available to the operator. This reducespossible operator confusion. And by locking out the operator'sability to touch the wrong control, using Touch PLS minimizes or eliminates damage—and the resulting cost—thatcould be caused by introducing inappropriate control signalsto the machine.Touch PLS units offer a unique multiple languages feature.Today, many production personnel do not speak English as afirst language. Companies are finding they can convey information to these operators faster, and with less confusion, whenthe display is in the operator's native language. Studies haveshown that in emergency situations, a person reacts fastest inthat person's native tongue. AVG Automation's µWIN programming software enables you to enter display messages inseveral different languages. Currently only English and Cyrilliccharacter sets are available.To use this feature, a user will design a screen as usual, andenter text strings, where applicable, in as many languages asdesired (16 max.). You do not have to design & maintain separate screens for each language. All your operator has to do isgo to the language selection screen and select the languageyou've already programmed into the Touch PLS. All screenswill then display their messages in the language selected.Programmable Limit Switches800-TEC-ENGRwww.avg.netSECTIONDThis is not to say that µWIN translates English-languagephrases into those of other languages—it only recognizesstrings of ASCII characters. You can create up to 16 textstrings (memory dependent) for each object— each in a different language. (Please note the more screens and words you use,the more memory you use, and the fewer sets of text stringsper object you can create.)D-11
TOUCH PLS SPECIFICATIONSPower Requirements:5" Color and 6" Models: 24 VDC @ 18 W8" Color Model: 24 VDC, 24 W9"Amber EL Model: 115/230 VAC 40 VA or 24 VDC 40 VA10" Color Model: 120 VAC 10%, 50-60 Hz, @ 1 A or24 VDC @ 1.25 AOperating Temperature:5" Models: 32 to 122 F (0 to 50 C)6" and 8" Models: 32 to 104 F (0 to 40 C)9" Model: 32 to 140 F (0 to 60 C)10" Model: 32 to 113 F (0 to 45 C)Position Resolution: 1 part in 1,000(consult factory for higher resolution)Update Time: 1.5 msecPROGRAMMABLE PARAMETERS:Scale Factor: Programmable from 16 to 999, common to all PLSsetupPosition Offset: Programmable to full scale factor value,common to all PLS setupNumber of PLS ON/OFF Setpoints: 112 per PLS setupNumber of PLS Setups: 32Speed Compensation: Leading and Trailing edge,programmable in scale factor units per 100 RPM, up to fullscale factor value. Each PLS output (channel) has its ownspeed compensationMotion Detector: LOW and HIGH motion limits, common to allPLS setups, programmable from 0-999 RPMBrake Monitor: Caution and Danger Limit, Stopping time 9.99sec. max.Number of PLS outputs: 16Dynamic Zero or ModZ Input or Brake Input:Modification Zero on the fly with an external input (edgetriggered) or brake inputSerial Communication: Via RS-485A portBroken Resolver Wire Detection: Indication for broken wire inI/O StatusRESOLVER INTERFACE:Position Transducer: Resolver, AVG Automation Series RL100,RL101, E7R, and E8R.Resolver Cable: CBL-10T22-CXXX or CBL-10T22-MXXXResolver Decoder: Ratiometric, tracks resolver shaft angle up toINPUTS/OUTPUTS:Electrical Specifications:I/O Power Input: 20 to 30 VDC @ 100 mA user's loadsN-Channel Sinking I/OOutput Logic Levels:Logic TRUE: MOSFET ON, 0.2 V Max. @ 100 mALogic FALSE: MOSFET OFF, 0.05 mA leakage @ 30 VMax. Current per Output: 600 mAMax. Current per Card: 2 AOutput Isolation: 1,500 VInput Logic Levels:Logic FALSE: 6-30 VDCLogic TRUE: 0-1.5 VDCInput Isolation: 1,500 VP-Channel Sourcing I/OOutput Logic Levels:Logic TRUE: MOSFET ON, 0.5 V Drop @ 100 mALogic FALSE: MOSFET OFF, 0.05 mA leakage @ 30 VMax. Current per Output: 600 mAMax. Current per Card: 2 AOutput Isolation: 1,500 VInput Logic Levels:Logic TRUE: 6-30 VDCLogic FALSE: 0-1.5 VDCInput Isolation: 1,500 VResolution Touch Shades/ Enclosure(pixels)Cells ColorsRatingsDisplaySizeColor (Active)5"320 x 2408x616NEMA 4Color5"320 x 2408x616NEMA 4Monochrome6"320 x 2408x63NEMA 4, 4XColor8"640 x 48016 x 1216NEMA 4Amber EL9"640 x 40016 x 103NEMA 4XColor (Active)10"640 x 48016 x 1216NEMA 4X1,800 RPM.Cable Length: 2,500 ft. max., shielded, le Limit Switches
M1020 PROGRAMMABLE LIMIT SWITCHTHE SIMPLE, LOW-COST REPLACEMENT FOR CAM/LIMIT SWITCHES Programmable Limit Switch (PLS) at the cost ofcam/limit switches Detachable operator interface for program security Increased machine productivity Programmable production rate counters Fine tuning in motionM1020-PLSAVG Automation, your Programmable Limit Switch (PLS)specialist, has now made it possible to simply obsolete electromechanical cam/limit switches! In spite of numerous limitations,such as cam bounce, limited life, and high maintenance,industrial use of electromechanical switches has continued dueto their low cost. The M1020-PLS from AVG Automation hasbroken down the last barrier the price. It offers solid-state reliability at the cost of electromechanical cam switches.mounted on the machine
Programmable Limit Switches Advantages of a PLS over Mechanical Limit Switches Feature Mechanical Switches Programmable Limit switch (PLS) 1. Accuracy 5 at best; degrades with time 0.1 repeatable to arc minutes; does not degrade with time 2. Setup Very cumbersome a
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New items on the PLS-5 were refined from the PLS-4 to reflect current research on language development and were determined via literature review and clinician feedback. Children’s response processes and clinician feedback during the pilot and tryout phases of the PLS-5 development was used to ensure the appropriateness and breadth of test items.File Size: 261KB
The Pearson Edexcel Level 3 Advanced GCE in Business is designed for use in schools and colleges. It is part of a suite of GCE qualifications offered by Pearson. These sample assessment materials have been developed to support this qualification and will be used as the benchmark to develop the assessment students will take. P v 3 1 2014 2014 2. P v 3 1 2014 2014 3 General marking guidance .
