User's Manual ND 281, NDP 281 (SW 246 181-01)

1 5/97 Measured valuedisplayUser's ManualND 281ND 281 NDP 281 NDP <>7894561230. CL2 Numeric keypadwith decimal pointDisplay of actual value and input(7-segment LED, 9 decades with algebraic sign)Status displaywith indicatorsIndicatorMeaningREFIf decimal points are additionally blinking:Display is waiting for reference decimal points are not blinking:Reference mark has been traversed display stores datum points innonvolatile memoryBlinking: display is waiting for ENT orCL to be values in inches 1 / 2 Selected datum pointPRINTB linking: Display is waiting for ENT tobe depressed for data outputSETB linking: Display is waiting for inputvalues< / = / >Sorting and tolerance checking:measured value smaller than lowersorting limit / within the sorting limits /greater than upper sorting limitMIN / MAX /Series of measurements: Minimum /DIFF / ACTL maximum / greatest difference(MAX MIN) / current measured valueBlinking: Confirm selection or deselectfunctionSTARTS eries of measurements is runningBlinking: Display is waiting for signal tostart series of measurementsKeyFunction Set datum Transfer input value Set display to value from P79 (P80!)

2 Leave parameter list Select datum Page backwards in parameter list Start series of measurements Switch display for series of measure-ments Start measured value output PRINT Select parameter after switch-on Page forward in parameter list Delete entry Set display to zero (P80!) CL plus MOD: select parameter list CL plus number: select parameter Algebraic sign Reduce parameter value Decimal point Increase parameter value3 MOD4 This Manual is for the measured value displayunits ND 281 and NDP 281 with the followingsoftware number or higher: 246 181-01 The software number is indicated on a label on therear DeliveredItems delivered with ND 281 Measured value display unit,ND 281 Abench-top designEncoder input 11 APPId.

3 Nr 283 481 ..ND 281 VEncoder input 1 VPPId. Nr 322 353 ..Power cord3 m ( ft) User's ManualND 281/NDP 281 Adhesive plug-in feetFor stacking ND 281 unitsItems delivered with NDP 281 NDP 281 Measured value display unit,for panel mountingEncoder input 11 APPId. Nr 289 214 ..Power terminalUser's ManualND 281/NDP 2815 ContentsContentsWorking with the ND Display UnitsPosition Encoders and Reference Marks6 Switch-On, Crossing Over the Reference Marks7 Datum Setting8 Finding Minimum and Maximum Values9 Sorting and Tolerance Checking12 Measured Value Output13 Display Freeze14 Error Messages15 Installation and SpecificationsRear Panel; Accessories16 Mounting18 Power Connection19 Operating Parameters20 List of Operating Parameters22 Linear Encoders25RS-232- Interface (X31)30 Switching Inputs and Outputs EXT (X41)35 Distance-To-Go Mode40 Specifications41 Dimensions426 Scale inDistance-codedlinear encoderreference marksPosition Encoders and Reference MarksThe ND 281 and NDP 281 display units are primarily intendedfor use with photoelectrical linear encoders with sinusoidal11- APP or 1-VPP signals: primarily for HEIDENHAINMT length gauges with 11 length gauges have one reference mark.

4 The scales ofother photoelectric linear encoders (see Linear Encoders )can contain one reference mark or several distance-codedreference there is an interruption of power, the relationship betweenthe position of the length gauge and the displayed positionvalue is lost. The reference marks on the position encodersand the REF reference mark evaluation feature enable thedisplay unit to quickly re-establish this relationship againwhen the power is a reference mark is crossed over, a signal is generatedwhich identifies that position as a reference point. At thesame time, the display unit restores the relationship betweenlength gauge position and display values which you lastdefined by setting the the linear encoders have distance-coded reference marks,you only need to traverse a maximum of 20 mm to restorethe datum.

5 Reference markReference marks on linear encodersPosition Encoders and Reference Marks7 Switch-On, Crossing Over the Reference MarksREF ModeCrossing over the reference marks automatically switchesthe display to REF mode: The last assignment of displayvalues to length gauge positions is stored in ) Press the CL key if you choose not to cross over thereference marks. Note that, in this case, the relationshipbetween length gauge position and display value will be lost ifthe power is interrupted or if the unit is switched on power.(Switch located on rear panel.) 1) is displayed. Indicator REF is on the reference markevaluation function. The position value that was lastassigned to the reference markposition is displayed. REF indicator lights up.

6 Decimal point is blinking. Cross over the reference the plunger until the display startscounting and the decimal point stops blink-ing. The display now is ready for operation. 5 . 6 9 7 0 1 For automation purposes, crossing over the reference marksand the display ENT .. CL can be disabled with , Crossing Over the Reference Marks8 You can switch between datums 1 and 2 as desired. Datum 2can be used, for example, for working with you switch back to datum 1, the display unit resumesdisplay of the MT's actual SettingThe datum setting procedure assigns a display value to aknown position. With the ND 200 series, you can set twoseparate datum are several ways to set the datum: Enter a numerical value, or Transfer a value from an operating parameter(see P79, P80), or By external signalSelect datum 1 or datum setting: Assignment of measured values to positionsWithout datum setting: unknown assignment of measured values topositionsZ?

7 ????Z5 010 15 20 Enter numerical value (here, 5).5 Confirm the entered numerical Setting9 Series of measurements: The MIN, MAX and DIFF values of an unevensurfaceExample: Series of measurements for determining eccentricity eFinding Minimum and Maximum Values2e = rMAX rMINe = DIFF2rMAXrMINeDIFFMAXMINACTLF inding Minimum and Maximum Values From aSeries of MeasurementsAfter a series of measurements has been started, the displaytransfers the first measured value to the memory for minimumand maximum values. Every ms, the display comparesthe current measured value with the memory contents: A newvalue is stored if it is greater than the stored maximum valueor smaller than the stored minimum value. At the same time,the display calculates and stores the difference DIFF betweenthe current MIN and MAX value from the series of measurementsMAXM aximum value from the series of measurementsDIFFD ifference MAX MINACTLC urrent measured valueStarting the series of measurements and selectingthe displayYou can start the series of measurements either by pressingMOD and selecting the desired display as described on thefollowing pages or by external signal over the switchinginputs at the D-sub connection EXT (X41, see page 34).

8 When a series of measurements is started, the internal MIN/MAX/DIFF memory is a series of measurementsSelect the display for a series selected indicator blinks (here, MAX).Confirm until the indicator START between MIN, MAX, DIFF and ACTL displaysIt is not possible to switch between the displaysas described below if the switching input forexternal control of the series of measurements(pin 6 onD-sub connection EXT) is an alternative, you can select the display with operatingparameter P21 (see Operating Parameters ).Select the new display of a series selected indicator blinks (here, MIN).Confirm the display now shows the smallest value measured duringthe current series of preselectionPress MOD to start the series of measurements and selectthe display with the parameter P86 allows you to define which indicatoris displayed first when MOD is the series of Minimum and Maximum Values11 Select the indicator indicator START a new series of measurementsrepeatedlyMODS tart a new series of a series of measurementsSelect the active indicator (MIN, ACTL,MAX, DIFF).

9 The indicator that lit up last the series of Minimum and Maximum Values12gutNacharbeitAusschu Sorting and Tolerance CheckingIn the sorting and tolerance checking mode, the display unitcompares the displayed value with the programmed upperand lower sorting limits. The sorting and tolerance checkingmode is enabled and disabled with operating parameter sorting limitsSorting limits are entered in operating parameters P18 andP19 (see Operating Parameters ).Sorting signalsThe indicators and switching outputs at D-sub connectionEXT (X41, see page 34) sort the display value into one of value is within sorting limits<Measured value is smaller than lower sorting limit>Measured value is greater than upper sorting limitOperating parameters for sorting and tolerance checkingSorting ON/OFFL ower sorting limitUpper sorting limitExample: Upper sorting limit = mmLower sorting limit = mmPart 1 Part 2 Part 3 Sorting and Tolerance <>7894561230.

10 CLMODPCM easured Value OutputThe RS-232- interface (X31) enables you to connect a printer ora PC to your display unitMeasured Value OutputFor technical information on the RS-232- interface (X31), information on the dataformat, etc., see the chapter RS-232- (X31) .Measured values can be output over the RS-232- (X31), for example to a printer or are several ways to start measured value output: Press MOD repeatedly until the indicator PRINT blinks,then start measured value output with ENT;or Input the command STX (Ctrl B) over the RXD input of theRS-232- interface (X31);or Input a signal for measured data output (Pulse or Contact)at the D-sub connection EXT (X41).14 Display FreezeWith the latch command, the display can be stopped for anyperiod of time.