User's Manual ND 281B (SW 349 797-01)
Contents
1. Linear Encoders 29 Linear Encoders Recommd parameter settings for HEIDENHAIN linear encoders with 11 pA signals continued Reference Millimeters Inches 9 marks Display Display a step Eg ts ES inmm o9 in inches EE o9 SE Q oS o S oig 43 P33 8 P33 8 LS 106 106C 20 Single 1000 0 001 1 3 0 00005 5 5 LS 406 406C 0 0005 5 4 0 00002 2 5 LS 706 706C ST 1201 LB 302 302C 40 Single 2000 0 005 5 3 0 0002 2 4 LIDA 10x 10xC 0 002 2 3 0 0001 1 4 0 001 1 3 0 00005 5 5 0 0005 5 4 0 00002 2 5 Recomma only for LB 302 0 0002 2 4 0 000001 1 5 0 0001 1 4 0 0000005 5 6 LB 301 301C 100 Single 1000 0 005 5 3 0 0002 2 4 0 002 2 3 0 0001 1 4 0 001 1 3 0 00005 5 5 LIM 102 12800 Single 0 1 1 1 0 005 5 3 0 05 5 2 0 002 2 3 Example Your encoder MT 101 Desired display step 0 0005 mm 0 5 uim Parameter settings P01 mm P43 single P31 10 P33 5 P38 4 Recommended parameter settings for HEIDENHAIN linear encoders with 1 V signals sci E Reference Millimeters Inches 2 marks Display Display B cr re E s Eg in mm ENS in inches SES o 9 oS jas Eja P 43 P33 P38 P33 P38 LIP 382 0 128 0 000002 2 6 0 0000001 1 7 0 000001 1 6 0 00000005 5 8 MT xx81 2 Singl2. measured value output signal DISPL HOLD Frozen concurrent display Display is frozen as long as a measured value output signal is present DISPL STOP Measured value output via PRINT function In the linear measurement mode Press MOD repeatedly until the indicator PRINT blinks Start the measured value output with ENT In the angular measurement mode Press MOD this feature can be disabled with operating parameter 86 Duration of measured value transfer 187 11 number of blank lines tp baud rate Indicator preselection linear measurement mode Operating parameter P86 allows you to define which indicator is displayed first when MOD is pressed Measured value output after signal through the Contact or Pulse inputs To start measured value output through the EXT interface X41 you can either Close the Contact input pin 23 on X41 against 0 V for example with a simple switch make contact or Close the Pulse input pin 22 on X41 against 0 V for example by triggering the input with a TTL logic device such as SN74LSxx Characteristic times for measured value output Process Time Minimum duration of Contact signal te 2 7 ms Minimum duration of Pulse signal 12 1 5 us Storage delay after Contact t4 lt 5 ms Storage delay after Pulse t4 lt 1 us Measured value output after t2 lt 57 ms Regeneration time t320 Duration of measu
3. 178 for separation from line power Encoder input X1 HEIDENHAIN flange socket 9 pin Input signals N 11 Maximum encoder cable length 30 m 98 5 ft Maximum input frequency 100 kHz Encoder input X2 HEIDENHAIN flange socket 12 pin Input signals 1 Vpp Maximum encoder cable length 60 m 197 ft Maximum input frequency 500 kHz Rear Panel Accessories 17 Rear Panel Accessories 18 Rear Panel Ports X1 X2 X31 and X41 comply with the recommendations EN 50 178 for separation from line power RS 232 C V 24 data interface X31 25 pin D sub connection female Data interface D sub connection Switching inputs and outputs EXT X41 25 pin D sub connection male X31 V 24 RS 232 C X41 EXT 100 240V 50 60 E3 see Jr Accessories Connecting elements Connector female 25 pin for D sub connection X41 Id Nr 249 154 ZY Connector male 25 pin for D sub connection X31 Id Nr 245 739 ZY Data interface cable 3 m 9 9 ft 25 pin for D sub con complete nection X31 Id Nr 274 545 01 N Power switch Ground connection Input X1 for one HEIDENHAIN 11 encoder Input X2 for one HEIDENHAIN 1 Vpp encoder Mounting You can fasten the ND 281 B from below by using M4 screws see illustration at right ND
4. REF reference mark evaluation feature enable the display unit to quickly reestablish this relationship again when the power is restored When a reference mark is crossed over a signal is generated which identifies that position as a reference point At the same time the display unit restores the relationship between length gauge position and display values which you last defined by setting the datum To restore the datum on scales with distance coded reference marks you only need to traverse a maximum of 20 mm for linear encoders and 10 or 20 for angle encoders depending onthe model Scale in Distance coded linear encoder reference marks Reference mark Reference marks on linear encoders Switch On Traversing the Reference Marks Turn on the power Switch located on rear panel ND 281 B appears for two seconds e ENT CL appears e REF indicator is blinking Switch on the reference mark evaluation function The position value that was last assigned to the reference mark position is displayed REF indicator lights up Decimal point is blinking Cross over the reference mark Move the plunger until the display starts counting and the decimal point stops blink ing The display is now ready for operation For automation purposes crossing over the reference marks and the display ENT CL can be disabled with parameter P82 REF Mode Crossing over
5. compensation value table Your machine may have a nonlinear axis error due to factors Such as axis sag or leadscrew errors Such deviations are usually measured with a comparator measuring system such as the HEIDENHAIN VM 101 In the linear measurement mode You can make a compensation value table with 64 compensation values In the angular measurement mode You can make a compensation value table with 72 compensation points point spacing 5 degrees Nonlinear Axis Error Compensation You select the compensation table through CODE and by entering the code number 10 52 96 see Operating Parameters Ascertaining the compensation values To ascertain the compensation values e g with a VM 101 you must select the compensation table and then press the key to select the REF display 34 The letter R at the left of the display indicates that the displayed position value is given with respect to the reference mark If R blinks you must traverse the reference mark Entries in the compensation value table Datum 1 Here you enter the point at which the compensation is to begin This point indicates the absolute distance to the reference point Do not change the datum after measuring the axis error and before entering the axis error into the compensation table e Spacing of the compensation points 1 The spacing of the compensation points is expressed as Spacing 2 um Enter the value of the exp
6. of measurements 1 e Sorting and tolerance checking Switching and sorting signals Set display and reset display to zero with external signal Measured value output RS 232 C V 24 Interface Baud rates 110 150 300 600 1200 2400 4800 9600 19 200 38 400 baud 1 Only in linear measurement mode Specifications 51 ND 281 B Dimensions in mm inches 2 15 5 T X81 X41 11 L2 SET START PRINT inch i L ETE lt gt MN MAX DIF X1 Ge esp e MA 77 ela 4 x 24 Y 172 0 2 6 77 008 NS 52 141 S 25 i S oo 52 2a HEIDENHAIN DR JOHANNES HEIDENHAIN GmbH Dr Johannes Heidenhain Strake 5 83301 Traunreut Germany lt 49 86 69 31 0 FAX 49 86 69 50 61 e mail info heidenhain de Service 149 86 69 31 1272 TNC Service 49 86 69 31 14 46 FAX 49 86 69 98 99 e mail service heidenhain de http www heidenhain de HEIDENHAIN G B Limited 200 London Road Burgess Hill West Sussex RH15 9RD Great Britain 01444 247711 FAX 01444 870024 350 267 21 SW 349 797 01 15 1 2001 Printed in Germany Subject to change without notice
7. parameters Signal period P31 Counting mode P33 Decimal places P38 Example Linear encoder with a signal period of 10 um Desired display step 0 000 5 mm Signal period P31 10 Counting mode P33 5 Decimal places P38 4 The tables on the following pages will help you to select the appropriate parameter settings Recommended parameter settings for HEIDENHAIN linear encoders with 11 pA signals aee 2 Reference Millimeters Inches marks Display Display so EC 7 s Eg in mm 53 in inches ZES o one o lt ig Eja P43 P33 P38 P33 P38 CT 2 Single 0 0005 5 4 0 00002 2 5 MT xx01 0 0002 2 4 0 00001 1 5 LIP 401A 401R Single 0 0001 1 4 0 000005 5 6 0 00005 5 5 0 000002 2 6 Recomma only for LIP 401 0 00002 2 5 0 000001 1 6 0 00001 1 5 0 0000005 5 7 0 000005 5 6 0 0000002 2 7 LF 103 103C 4 Single 5000 0 001 1 3 0 00005 5 5 LF 401 401C 0 0005 5 4 0 00002 2 5 LIF 101 101C 0 0002 2 4 0 00001 1 5 LIP 501 501C 0 0001 1 4 0 000005 5 6 LIP 101 Single 0 00005 5 5 0 000002 2 6 Recomma only for LIP 101 0 00002 2 5 0 000001 1 6 0 00001 1 5 0 0000005 5 7 MT xx 10 Single 0 0005 5 4 0 00002 2 5 0 0002 2 4 0 00001 1 5 0 0001 1 4 0 000005 5 6 LS 303 303C 20 Single 1000 0 01 1 2 0 0005 5 4 LS 603 603C 0 005 5 3 0 0002 2 4
8. 1 20 P33 1 P38 23 Recommended parameter settings for HEIDENHAIN angle encoders with 11 pA 1 V signals Model a Reference Display E 5 marks step Bw 5 5 EQ a9 o 6 a c 5 5 8 43 P37 P38 ROD 450 3600 Single 0 01 1 ROD 456 ROD 486 0 005 5 3 ROD 1080 0 001 1 3 ROD 250 C ROD 280 C 9000 Dist 500 0 005 5 3 RON 255 C RON 285C coded 0 001 1 3 ROD 250 C ROD 280 C 18 000 Dist 1000 0 001 1 3 ROD 255 C RON 285C coded 0 0005 5 4 ROD 700 C ROD 780 C 0 0001 1 4 RON 705 C RON 785C RON 706 C RON 786 C RON 905 36 000 One Single 0 0001 1 4 ROD 800 ROD 880 C 36000 Dist 1000 0 0001 1 ROD 806 C ROD 886 C coded Example Set parameters for any encoder Angle encoder e g with line count s 18 000 P36 Desired display step e g a 0 001 Counting mode P37 1 display counts 1 2 3 Decimal places of a P38 3 Convert decimal degrees into degrees minutes seconds 1 degree 1 60 minutes 60 1 minute 1 60 seconds 60 1 second 1 0 000278 Angle Encoders 33 Nonlinear Axis Error Compensation g If you want to use the nonlinear axis error compensation feature you must e Activate the feature with operating parameter 40 see Operating Parameters e Traverse the reference marks after switching on the display unit e enter a
9. 15263 Select the user parameter POO CODE see Operating Parameters Enter the code number 415263 gt Confirm your entry with With the or key ENT select the ND LENGTH or ND ANGLE mode respectively Confirm your selection with ENT The display unit resets itself gt For further procedure see Switch on Traversing the Reference Marks Linear Angular Measuring Modes 21 Operating Parameters 22 Operating Parameters Operating parameters allow you to modify the operating characteristics of your ND display unit and define the evaluation of the encoder signals Operating parameters are designated by e the letter P a two digit parameter number and abbreviation Example PO1 INCH The factory settings of the operating parameters are indicated in the parameter list see List of Operating Parameters in boldface type Parameters consist of user parameters and protected operating parameters which can only be accessed by entering a code number User parameters User parameters are operating parameters that can be changed without entering the code number POO to P30 P50 P51 P79 P86 P98 The functions of the individual user parameters are detailed in the list of operating parameters see List of Operating Parameters To access a user parameter after switching on the display While ENT CL is d
10. 281 B display units are stackable Adhesive plug in feet supplied with your unit prevent the stacked units from being moved out of place 172 0 2 6 77 008 140 0 2 5 51 008 Hole positions for mounting the ND display unit 77 i nA mi 7 Alternatives of stacking the display units Mounting 19 Power Connection 20 Power Connection The rear panel of the ND 281 B contains a connecting jack for a power cord with Euro connector power cord supplied with the delivery Minimum cross section of the power cord 0 75 mm2 Power supply 100 Vac to 240 Vac 15 to 10 50 Hz to 60 Hz 2 Hz A voltage selector is therefore not necessary Danger of electrical shock Unplug the power before opening the housing Connect the grounding conductor Do not interrupt the grounding conductor Danger to internal components Do engage or disengage any connections while the unit is under power Use only original replacement fuses To increase noise immunity connect the ground a terminal on the rear panel to the central ground point of the machine Minimum cross section 6 mm Linear Angular Measuring Modes You can select the linear measuring mode or angular measuring mode by entering the code number 4
11. Interrupt DC3 Ctrl S Continue DC1 Ctrl Q Interrogate error message Ctrl E Example Data sequence during measured value output Measured value 5 23 mm The measured value is within the sorting limits 2 and is the current value of a series of measurements Measured value output eoo OGO 23 al lt gt 90 060 Algebraic sign Numerical value with decimal point 10 characters on the whole leading zeros are output as blank spaces Angle measurement min sec up to 3 dec spaces Blank space Unit Blank space mm inch fault Sorting status lt gt if P18 gt P19 or blank space Series of measurements S MIN A ACTL G MAX D DIFF or blank space CR carriage return LF line feed lt LES RS 232 C V 24 Data Interface X31 39 RS 232 C V 24 Data Interface X31 40 Operating parameters for measured value output Parameter Function P50 RS232 Baud rate P51 RS232 Number of additional blank lines for measured value output Display freeze during measured value output In operating parameter P23 you can specify how the measured value output signal will affect the display unit Display freeze during measured value output P23 Concurrent display no display freeze The display value is the current measured value DISPL ACTL Frozen display Display is stopped frozen and updated by every
12. J 1864 HEIDENHAIN User s Manual ND 281 Measured Value Displays 6 2000 Display of actual value and input Numeric keypad 9 decades with algebraic sign with decimal point Status display with indicators Function Set datum Transfer input value Set display to value from P79 P80 Leave parameter list e Select datum Page backwards in parameter list Select parameter after switch on Page forward in parameter list Start series of measurements 1 Switch display for measurement series 1 Start measured value output PRINT Delete entry Set display to zero P80 CL plus MOD select parameter list CL plus number select parameter Delete parameter input and show parameter number Algebraic sign Reduce parameter value Decimal point Increase parameter value 1 Only in linear measurement mode Indicator REF inch Meaning If the decimal point is also blinking Display is waiting for reference mark traversing If decimal point is not blinking Reference mark has been traversed display stores datum points in nonvolatile memory Blinking display is waiting for ENT or CL to be depressed Position values in inches L 2 Selected datum point PRINT Linear measurement Blinking Display is waiting for ENT to be pressed for data output Angular measurement Measured value output with MOD key SET B
13. NG 1 Enter the spacing of the compensation points on the axis to be corrected for example gn um equals 1 024 mm Press MOD four times to select COMP NR 01 You cannot enter values in the POS NR 00 COMP NR 00 and POS NR 01 boxes Cu COMP NR 01 ol Loji 2 Ig Enter the associated compensation value e g 0 01 mm Press MOD twice to select COMP NR 02 You cannot enter any values in the POS NR 02 box _ COMP NR 02 2 I Enter all further compensation points If you want so select a compensation point directly press CL and simultaneously enter the desired compensation point number E Conclude entry 1 Only in the linear measurement mode Deleting a compensation value table di 7 Select the operating parameters gp P C rom Select POO CODE T C ses EG EI C gt L DATUM Select the delete function XX a DELETE aT Confirm with ENT or cancel with CL lt Exit the compensation table mode Nonlinear Axis Error Compensation RS 232 C V 24 Data Interface X31 38 RS 232 C V 24 Data Interface X31 The RS 232 C V 24 interface X31 of your display unit enables you to output measured data in ASCII format for example to a printer or PC Connecting cable You can use a connect
14. OMP Linear compensation COMP ON P41 L COMP Linear error compensation 1 99 999 9 lt P41 lt 99 999 9 um m Default setting 0 Example Find input value for P41 Displayed measuring length L4 620 000 mm Actual length measured e g with the VM 101 comparator System from HEIDENHAIN 619 877 mm Length difference AL L La 123 um Compensation factor k P41 AL L 123 um 0 62 m 198 4 um m Reference marks One reference mark P43 REF SINGLE REF Distance coded with 500 SP SP signal period 500 SP Distance coded with 1000 e SP e g for HEIDENHAIN LS C 1000 SP Distance coded with 2000 e SP 2000 SP Distance coded with 5000 e SP 5000 SP List of Operating Parameters 25 List of Operating Parameters 26 Parameter Settings Function Parameter Settings Function P44 REF Reference mark evaluation P80 ENT CL Set display Evaluate the reference mark REF ON No set Set with Do not evaluate the reference ea SUONI OEF mark REF OFF Zero reset with CL PE ADAE Encoder monitoring setting disabled with ENT Glasses ON No monitoring ALARM OFF Zero reset with CL and set with Monitor the frequency FREQUENCY ENT to value selected in 79 CL ENT ON Monitor contamination CONTAMINAT P82 DISPL ON Message after switch on ENT CL message ME
15. SSAGE ON Contamination frequency FRQ CONT No message MESSG OFF P50 RS232 Baud rate Ext REF 110 150 300 600 1200 EOS EAT REE Led 2400 4800 9600 19 200 OVET por POM 38400 baud No REF over D sub port EXT EXT REF OFF P51 RS232 Additional blank lines P86 MOD n the linear measurement mode during data output BK LINE 1 First indicator after pressing MOD 0 lt 51 lt 99 START PRINT Default setting 1 MIN ACTL MAX DIFF P62 Al Trigger limit 1 n the angular measurement mode 7 em Trigger limit 2 RINT via MOD disabled PRINT OFF SERENA P79 PRESET Value for datum point RINT via MOD enabled PRINT Enter numerical value for datum setting over switching input or with ENT key Parameter P98 LANGUA Settings Function Conversational language German English French Italian Dutch Spanish Danish Swedish Finnish Czech Polish Hungarian Portuguese LANGUAGE iANGUAGI zH iANGUAGI LANGUAGE LANGUAGE LANGUAGE LANGUAGE LANGUAGE LANGUAGE zH E _ p GB NL DK FI CZ PL LANGUAGE LANGUAGE List of Operating Parameters 27 Linear Encoders 28 Linear Encoders The ND 281 B display unit is designed for use together with photoelectrical encoders with sinusoidal signals 11 App or Display step with linear encoders You can select a specific display step by adapting the following operating
16. are exceeded the corresponding outputs pins 17 18 are activated Signals Operating parameters Pin Switching signals P62 switching limit 1 15 P63 switching limit 2 16 Sorting signals P18 lower sorting limit 17 P19 upper sorting limit 18 Zero crossover The display value zero activates the corresponding output pin 14 Minimum signal duration is 180 ms Output EE Path Switching point Measured value lower sorting limit Measured value Upper sorting limit Path Lower limit Upper limit Path Pin 15 A1 Time curve of signal at pin 15 for trigger limit 1 5 mm ty lt 30 ms Switching signal for errors The display unit permanently monitors functions such as measuring signal input frequency and data output and displays an error message if it detects an error If errors occur that seriously influence measurement or data output the display unit activates a switching output This feature allows monitoring of automated processes Error Switching Outputs EXT X41 47 Locking the Keypad You can disable or re enable the keypad by entering the code number 24 65 84 Select the user parameter POO CODE see Operating Parameters Enter the code number 24 65 84 gt Confirm the entry with ENT gt Withthe e or key select KEYS KEYS OFF gt Confirm your selection with ENT If the keypad is lo
17. between the displays as MOD urements described below if the switching input for external The selected indicator blinks here MAX control of the series of measurements pin 6 on MAX D sub connection EXT is active M Asan alternative you can select the display with operating ENT Confirm selection parameter P21 see Operating Parameters OPERE Select the new display of a series of measurements The selected indicator blinks here MIN until the START indicator blinks MIN 5 firm the ch ENT Start the series of measurements Confirm the change The display now shows the smallest value measured during the current series of measurements Indicator preselection Press MOD to start the series of measurements and select the display with the indicators Operating parameter P86 allows you to define which indicator is displayed first when MOD is pressed Starting a new series of measurements Repeatedly Select the indicator START The indicator START blinks Start a new series of measurements Ending a series of measurements Repeatedly MOD B or Select the active indicator MIN ACTL MAX DIFF The indicator that lit up last blinks End the series of measurements Repeatedly MOD Select the indicator START The START indicator blinks n g E 5 End the series of measur
18. cant Special case Display current measured value ACTL If you wish to display the current measured value ACTL of a series of measurements note for inputs 7 8 and 9 Either none or more than one of these inputs must be active Switching Inputs and Outputs EXT X41 43 Switching Inputs and Outputs EXT X41 44 Inputs Input signals Internal pull up resistor 1 active with low level Outputs Output signals Open collector outputs active with low level Trigger by making contact against 0 V or by low level signal over TTL logic device Delay for set zero reset ty lt 2 ms Minimum pulse duration for all signals tmin gt 30 ms Signal level of inputs Status Level High 3 9 lt lt 15 Low O05V lt sU lt 09V 1 lt 6 Delay until signal output ty lt 30 ms Signal duration of zero signal trigger limit A1 A2 ty 180 ms Signal level of outputs Status Level High lt 32 IS 10pA Low U lt 04V lt 100 mA LI tmin 2 30 ms 1 lt 100 mA lt 32 V Setting and zero resetting the display With an external signal you can set the display to the value selected in parameter P79 pin 3 or reset each axis to zero pin 2 Enabling and disabling REF mode Operating parameter P85 allows you to activate the input pin 25 which will be used for setting the display externally to REF mode when the unit is sw
19. cked you can only select the datum or select POO CODE over the MOD key Displaying the Software Version To display the software version of the display unit enter the code number 66 55 44 gt Select the user parameter POO CODE gt Enter the code number 66 55 44 gt Confirm your entry with ENT The display unit shows the software number With the key you can switch the display to the date of issue gt To exit the software version display mode press ENT Displaying the Software Version 49 Distance to Go Mode 50 Distance to Go Display Mode 1 Normally the display shows the actual position of the en coder However it is often more helpful to display the re maining distance to an entered nominal position especially when you are using the display unit for machine tools and au tomation purposes You can then position simply by traversing to display value zero You can access the distance to go display by entering the code number 246 582 Display Meaning DELTA ON Distance to go display active DELTA OFF Distance to go display not active Traversing to zero with distance to go display Select datum point 2 Enter the nominal position gt Move the axis until the display value is zero 1 Only in linear measurement mode Function of switching outputs A1 and A2 In the distance to go mode switching outputs A1 pin 15 and A2 pin 16 have a different function th
20. e 0 0005 5 4 0 00002 2 5 LIP 481A 481R single 0 0002 2 4 0 00001 1 5 0 0001 1 4 0 000005 5 6 0 00005 5 5 0 000002 2 6 Recomma only for LIP 401 0 00002 2 5 0 000001 1 6 0 00001 1 5 0 0000005 5 7 0 000005 5 6 0 0000002 2 7 LF 183 183C 4 Single 5000 0 001 1 3 0 00005 5 5 LF 481 481C 0 0005 5 4 0 00002 2 5 LIF 181 181C 0 0002 2 4 0 00001 1 5 LIP 581 581C 0 0001 1 4 0 000005 5 6 VM 182 0 00005 5 5 0 000002 2 6 Recomma only for VM 182 0 00002 2 5 0 000001 1 6 0 00001 1 5 0 0000005 5 7 LS 186 186C 20 Single 1000 0 001 1 3 0 00005 5 5 LS 486 486C 0 0005 5 4 0 00002 2 5 ST 1281 Linear Encoders 31 Recommended parameter settings for HEIDENHAIN linear encoders with 1 V signals continued o 3 Reference Millimeters Inch 9 g marks Display Display E g step 9 step zo ER lt in mm 39 55 jininhes 538 59 gt o oS o 5 5 3 EA P 43 P33 P38 33 P38 Zi LB 382 382C 40 Single 2000 0 005 5 3 0 0002 2 4 LIDA 18x 18xC 0 002 2 3 0 0001 1 4 0 001 1 3 0 00005 5 5 0 0005 5 4 0 00002 2 5 Recomma only for LB 382 0 0002 2 4 0 00001 1 5 0 0001 1 4 0 000005 5 6 LB 381 381C 100 Single 1000 0 005 5 3 0 0002 2 4 0 002 2 3 0 0001 1 4 0 001 1 3 0 00005 5 5 Example Your encoder LS 186 C Desired display step 0 001 mm 1 Parameter settings P01 mm P43 1 000 P3
21. ements Sorting and Tolerance Checking In the sorting and tolerance checking mode the display unit compares the displayed value with the programmed upper and lower sorting limits The sorting and tolerance checking mode 1 enabled and disabled with operating parameter P17 Entering sorting limits Sorting limits are entered in operating parameters P18 and P19 see Operating Parameters Sorting signals The indicators and switching outputs at D sub connection EXT see section on X41 sort the display value into one of three classes Display Meaning Measured value is within sorting limits Measured value is smaller than lower sorting limit lt gt Measured value is greater than upper sorting limit Operating parameters for sorting and tolerance checking P17 SORT Sorting ON OFF P18 L LIMIT Lower sorting limit P19 U LIMIT Upper sorting limit Part2 Part 3 Example Upper sorting limit 26 02 mm Lower sorting limit 26 00 mm Measured Value Output interface X31 information on the data format etc att For technical information on the RS 232 C V 24 data see the chapter RS 232 C V 24 Interface X31 Measured values can be output over the RS 232 C V 24 interface X31 for example to a printer or PC There are several ways to start measured value out
22. erating parameters or e page forward or backward after the change Operating Parameters 23 List of Operating Parameters 24 List of Operating Parameters Parameter P11 SCL P12 SCL Settings Function Scaling factor 1 Scaling factor on SCALING ON Scaling factor off SCALNG OFF Scaling factor 1 Enter a numerical value 0 100000 lt P12 lt 9 999999 Default setting 1 000000 P17 SORT Sorting and tolerance checking Sorting and tol checking ON SORT ON Sorting and tol checking OFF SORT OFF P18 L LIMIT Lower limit for sorting P19 U LIMIT Upper limit for sorting P21 SERIES Display for series of measurements 1 OFF MAX ACTL DIFF Parameter Settings Function P00 CODE Enter a code number 95148 change the protected operating parameters 41 52 63 To select the linear or angular measurement mode 10 52 96 Nonlinear axis error compensation 24 65 84 To lock the keyboard 66 55 44 To show the software version 24 65 82 Distance to go display 01 Units of measurement 1 Display in millimeters MM Display in inches INCH P02 X1 X2 Select an encoder input Signals at X1 11 Signals at X2 1 VPP PO8 DISPL Display mode 2 Decimal Degrees DEC DEGREE Deg minutes seconds DEG MIN SEC P09 ANGLE Angle display 2 180 180 DEG ENDLESS 360 360 DEG 1 Only in linear measurement mode 2 Only in angula
23. ey are symmetrical to the display value zero For example if a switching point of 10 mm is entered in P62 output A1 switches at both 10 mm 10 mm The figure below shows output signal A1 when approaching zero from the negative direction 10 0 10 me Path Pin 15 A1 Time curve of a signal for switching limit A1 10 mm tq lt 30 ms tg lt 180 ms Specifications Housing ND 281B Benchtop design cast metal housing W D 239 mm 84 6 mm 224 mm Operating temperature 0 to 45 32 to 113 Storage temperature Weight 20 to 70 C 4 F to 158 F Approx 1 5 kg 3 3 Ib Relative humidity lt 75 annual average lt 90 in rare cases Power supply Primary clocked power supply 100 Vac 240 Vac 15 to 41096 50 Hz to 60 Hz 2 Hz Line fuse F 1 A inside the housing Power consumption 8 W typically Electromagnetic Noise immunity As per VDE 0843 Parts 2 and 4 severity 4 Protection 40 according to IEC 529 Encoder inputs For linear and angle encoders with sinusoidal output signals 11 UApp 1 Reference mark evaluation for distance coded and single reference marks Input frequency Display step Datum points X1 11 UApp Max 500 kHz for 60 m cable length X2 1 Vpp Max 100 kHz for 30 m cable length Adjustable Two Functions Series
24. ing cable with full wiring figure at upper right or simplified wiring below right A cable with full wiring is available from HEIDENHAIN Id Nr 274 545 On this type of cable pin 6 and pin 8 are additionally connected over a jumper Maximum cable length 20 m 66 ft ND CHASSIS GND 1 0 4 1 CHASSIS GND TXD 2 2 TXD RXD ea es 3 RXD RIS 4 4 RTS CTS P a 5 CTS DSR 6 6 DSR SIGNAL GND 70 7 SIGNAL GND DTR 20 20 DTR Full wiring ND CHASSIS GND 1 O 1 CHASSIS GND TXD dide 2 TXD RXD 3 3 RXD RTS 403 4 RTS cis 50 5 CTS DSR 6 0 4 e DSR SIGNAL GND 7 O 41 7 SIGNAL GND 20 O 20 DTR Simplified wiring Pin layout 232 24 X31 Pin Signal Assignment 1 CHASSIS GND Chassis ground 2 TXD Transmitted data 3 RXD Received data 4 RTS Request to send 5 CTS Clear to send 6 DSR Data set ready 7 SIGN GND Signal ground 8to19 Not assigned 20 DTR Data terminal ready 21to25 Not assigned Levels for TXD and RXD Logic level Voltage level Active 3Vto 15V Not active 3Vto 15V Levels for RTS CTS DSR and DTR Logic level Voltage level Active 3Vto 15V Not active 3Vto 15V Data format and control characters Data format 1 start bit 7 data bits Even parity bit 2 stop bits Control characters Call measured value STX Ctrl B
25. is Error Compensation 34 RS 232 C V 24 Interface X31 38 Switching Inputs and Outputs EXT X41 43 Locking the Keypad 48 Displaying the Software Version 49 Distance to Go Mode 50 Specifications 51 Dimensions 52 1 Only in linear measurement mode Position Encoders The ND 281 B display unit is designed for use with photo electrical linear or angular encoders with sinusoidal signals primarily for HEIDENHAIN MT length gauges When shipped by HEIDENHAIN the display units are set to the linear measurement mode You can switch between the linear and angular modes by entering the code number415263 see Linear Angular Measurement Modes On the back of the display you will find two flange sockets for connecting the encoder X1 for encoders with 11 u Appsinusoi dal current signals and X2 for 1 Vpp sinusoidal voltage signals Before shipping HEIDENHAIN activates the encoder connec tion for 11 sinusoidal current signals With parameter P02 you can activate the encoder input that matches your encoder see Operating Parameters Reference Marks The MT length gauges have one reference mark The scales of other photoelectric linear or angular encoders can contain one reference mark or many distance coded reference marks If there is an interruption of power the relationship between the position of the length gauge and the displayed position value is lost The reference marks on the position encoders and the
26. isplayed Display first user parameter MOD during operation Together Display first user parameter To go directly to a user parameter Together Press and hold CL while entering the first digit of the parameter number here 1 Enter the second digit of the parameter number here 9 The display shows the selected user parameter X Code number for changing protected operating parameters If you wish to change protected operating parameters you must first enter the code number 95 148 Select the user parameter POO CODE Enter the code number 9 51 48 Confirm entry with ENT Parameter P30 appears on the display By paging through the list of operating parameters you can display and if necessary change each protected operating parameter and of course each user parameter Once you have entered the code number the protected operating parameters remain accessible until the display unit is switched off Functions for changing the operating parameters Function Page forward in the list of operating parameters ey Page backward in the list of operating parameters Reduce parameter value Increase parameter value Correct entry and display parameter designations Confirm change or numerical entry leave list of operating parameters BEBBDBSH A changed parameter is stored as soon as you e leave the list of op
27. itched on or when the power is restored after an interruption The next signal deactivates REF mode again switchover function Ignoring reference mark signals If this input pin 4 is active the display will ignore all reference mark signals A typical application of this function is for measuring lengths with a rotary encoder and spindle in this case a cam switch releases the reference mark signal at a preset position Externally selecting MIN MAX 1 Starting a series of measurements Switching the display between MIN MAX DIFF ACTL You can activate the operating mode for finding minimum and maximum values from a series of measurements with an external signal pin 6 low level signal must be present continuously The setting selected with MOD or operating parameter P21 is disabled You can switch to MIN MAX DIFF ACTL display pins 7 8 9 low level signal must be present continuously and START pin 5 Pulse a new series of measurements only by external signal over the switching inputs 1 Only in linear measurement mode Switching Inputs EXT X41 45 Switching Inputs EXT X41 46 Switching signals As soon as the trigger points defined in parameters are reached the corresponding outputs pins 15 16 are activated You can set up to two trigger points The switching point zero has a separate output see Zero crossover Signals for sorting and tolerance checking If the sorting limits defined in parameters
28. linking Display is waiting for input values Sorting and tolerance checking measured value smaller than lower limit within the limits greater than upper limit MIN MAX DIFF ACTL1 1 Series of measurements Minimum maximum greatest difference MAX MIN current measured value Blinking Confirm selection or deselect function Series of measurements is running Blinking Display is waiting for signal to start series of measurements Items supplied with ND 281 ND 281B Measured value display unit benchtop model Encoder input 11 UApp 1 Vpp Id Nr 344 996 xx Power cord 3 m 9 9 ft User s Manual ND 281B Adhesive plug in feet For stacking ND 281B units This manual is for the ND 281 B measured value display with the following software number or higher 349 797 01 The software number is indicated on a label on the rear panel Contents Working with the ND Display Units Installation and Specifications Encoders 6 Rear Panel Accessories 17 Reference Marks 7 Mounting 19 Switch On Traversing the Reference Marks 8 Power Connection 20 Datum Setting 9 Linear Angular Measuring Modes 21 Finding Minimum and MaximumValues 1 10 Operating Parameters 22 Sorting andTolerance Checking 13 List of Operating Parameters Zu Measured Value Output 14 Linear Encoders 28 Display Freeze 15 Angle Encoders 33 Error Messages 16 Nonlinear Ax
29. ogram for measured value output with Ctrl B Propagation times for measured value output after Ctrl B Switching Inputs and Outputs EXT X41 AN 0 Danger to internal components Voltage sources for external circuitry must conform to the recommendations in EN 50 178 for low voltage electrical separation Connect inductive loads only with a quenching diode parallel to the inductance Only use shielded cable Connect the shield to the connector housing Outputs at D sub connection EXT X41 Pin Function 14 Display value is zero 15 Measured value 2 trigger limit A1 P62 16 Measured value trigger limit A2 P63 17 Measured value lt lower sorting limit P18 18 Measured value gt upper sorting limit P19 19 Error see Error Messages 1 Only in the linear measurement mode Inputs at D sub connection EXT X41 Pin Function 1 10 OV 2 Reset display to zero clear error message 3 Set display to the value selected in P79 4 Ignore reference mark signals 5 Start series of measurements 1 6 Externally select display value for series of measurements 1 7 Display MIN value of series of measurements 1 Display MAX value of series of measurements 1 Display difference MAX MIN 1 22 Pulse Output measured value 23 Contact Output measured value 25 Enable or disable REF mode current REF status is changed 12 13 24 Do not assign 11 20 21 Va
30. onent in into the compensation value table Minimum input value 6 0 064 mm Maximum input value 20 1048 576 mm Example 900 mm traverse with 15 compensation points gt 60 000 mm spacing between points Nearest power of two 2 65 536 mm see Table for determining the point spacing Input value in the table 16 e Compensation value You enter the measured compensation value in milli meters for the displayed compensation point Compensa tion point 0 always has the value 0 and cannot be changed 1 Only in the linear measurement mode Table for determining the point spacing Exponent Point spacing inmm in inches 6 0 064 0 0023 7 0 128 0 0050 8 0 256 0 0100 9 0 512 0 0200 0 1 024 0 0403 1 2 048 0 0806 2 4 016 0 1581 3 8 192 0 3225 4 16 384 0 6450 5 32 768 1 290 6 65 536 2 580 7 131 072 5 160 8 262 144 10 32 9 524 288 20 64 20 1048 576 41 25 Nonlinear Axis Error Compensation 35 Nonlinear Axis Error Compensation 36 Selecting the compensation table entering an axis correction together EH V Select the operating parameters gt gt Select POO CODE gt gt P00 CODE Enga Enter the code number 10 52 96 confirm with ENT EIE E a shown for approx two seconds 1 Enter the active datum for the error on the axis to be confirmed e g 27 mm Press MOD to select the next input box SPACI
31. put Inthelinear measurement mode Press MOD repeatedly until the PRINT indicator blinks then start measured value output with ENT In the angular measurement mode Press the MOD key this feature can be disabled with the operating parameter 86 or Input the command STX Ctrl B over the RXD input of the RS 232 C V 24 interface X31 or Inputa signal for measured data output Pulse or Contact at the D sub connection EXT X41 The RS 232 C V 24 interface X31 enables you to connect a printer or a PC to your display unit Display Freeze With the latch command the display can be stopped for any period of time The internal counter remains active Parameter P23 selects the display freeze mode and offers three settings Concurrent display no display freeze the display value is the current measured value e Frozen display display value is frozen and is updated with each signal for measured value output e Frozen concurrent display display remains frozen as long as the latch signal is present after the signal the display resumes continuous display of the current meas ured values e io e io e pe Position i Latch signal Frozen SS889e889888888888Zz22222222222222288998 ame o op qe lt lt oOooo0o0000000006000000000000000060620202020 display OOOOOOcccoccoccococdoooooooocooococcooocoococooco concur
32. r measurement mode P23 DISPL Display stop for measured value output Concurrent display no display freeze the display value is the current actual value DISPL ACTL Frozen display hold display until next measured value output DISPL HOLD Frozen concurrent display freeze display as long as Pulse Contact for measured value output is present DISPL STOP Parameter Settings Function P30 DIR Counting direction Positive counting direction with positive direction of traverse DIRECT POS Negative counting direction with positive direction of traverse DIRECT NEG Signal period 1 of encoder 0 000 000 01 lt P31 lt 99 999 9999 Default setting 10 P31 S PER P33 COUNT Counting mode 1 0 1 2 3 4 5 6 7 8 9 COUNT 0 1 0 2 4 6 8 COUNT 0 2 0 5 COUNT 0 5 P36 SP R Signal periods per revolution 2 1 lt P36 lt 999 999 Default setting 36 000 P37 COUNT Counting mode 2 0 1 2 3 4 5 6 7 8 9 COUNT 0 1 0 2 4 6 8 COUNT 0 2 0 5 COUNT 0 5 P38 DP POS Decimal places 3 1 2 3 4 5 6 up to 8 for inch display 1 Only in linear measurement mode 2 Only in angular measurement mode 3 Depends on signal period P31 and measuring unit PO1 Parameter Settings Function P40 COMP Select encoder compensation No compensation COMP OFF Nonlinear up to 64 compensation points for linear encoders up to 72 for angle encoders fixed spacing of 5 deg NONL C
33. red value transfer p 187 11 number of blank lines 5 baud rate EXT X41 Pin 23 Pin 1 0V EXT X41 Pin 22 m Pin 1 0V Triggering the Contact and Pulse inputs at D sub connection EXT X41 18 2 ti i S Signal transit times for measured value output after Pulse or Contact RS 232 C V 24 Data Interface X31 41 RS 232 C V 24 Data Interface X31 42 Measured value output after STX signal Ctrl B If the display unit receives the control character STX Ctrl B over the RS 232 C V 24 interface X31 it outputs the current measured value over the interface Transfer the control character Ctrl B over the RXD line of the RS 232 C V 24 interface X31 Characteristic times for measured value output Process Time Storage delay t lt 1ms Measured value output after t2 lt 50 ms Regeneration time t320 These times are prolonged if functions are active for example series of measurements with DIFF value display Duration of measured value transfer _ 187 11 number of blank lines 5 tp baud rate 10 1 18 20 CLS 30 PRINT V 24 RS 232 C 40 OPEN COM1 9600 E 7 AS 1 50 PRINT 1 CHR 2 60 IF INKEY lt gt THEN 130 70 C LOC 1 80 IF C lt LSTHEN 60 90 XS INPUTS L 1 100 LOCATE 9 1 110 PRINT X 120 GOTO 50 130 END BASIC pr
34. rent 660606660060060000660000000060000800000090 display Error Messages Display Effect Cause RS232 FAST Command for measured value output followed too quickly by another 1 SIGNAL Encoder signal is too weak The scale may be contaminated 1 The connected device has not sent a DSR signal 1 DSR MISSING REF ERR The spacing of the reference marks as defined in P43 is not the actual spacing 1 FORMAT ERR Data format baud rate etc do not match 1 FREQUENCY Input frequency too high for encoder input Traversing speed may be too fast 1 MEMORY ERR Checksum error Check the datum operating parameters and compen sation values for nonlinear axis error compensation If this error recurs contact your service agency 1 These errors are important for the attached device The error signal pin 19 at D sub connection EXT is active Other Error Displays If OVERFLOW appears the measured value is too large or too small Setanew datum or Traverse back If all sorting signals light up the upper sorting limit is smaller than the lower limit Change operating parameters P18 and or P19 To clear error messages Once you have removed the cause of the error Clear the error message with the CL key Rear Panel Ports X1 X2 X31 and X41 comply with the recommendations in EN 50
35. the reference marks automatically switches the display to REF mode The last assignment of display values to length gauge positions is stored in nonvolatile memory 1 Press the CL key if you choose not to traverse the reference marks Note that in this case the relationship between length gauge position and display value will be lost if the power is interrupted or if the unit is switched off Datum Setting The datum setting procedure assigns a display value to a known position With the ND 200 series you can set two separate datum points There are several ways to set the datum e Enter a numerical value or Transfer a value from an operating parameter see P79 P80 or e By external signal _ Select datum 1 or 2 Enter numerical value here 5 SET blinks Confirm the entered numerical value You can switch between datums 1 and 2 as desired Datum 2 can be used for example for working with incremental dimen sions When you switch back to datum 1 the display unit resumes display of the encoder s actual position Without datum setting unknown assignment of measured values to positions 20 15 10 After datum setting Assignment of measured values to positions Finding Minimum and Maximum Values from Series of Measurements 1 After a series of measurements has been started the display transfers the first measured
36. value to the memory for minimum and maximum values Every 0 55 ms the display compares the current measured value with the memory contents A new value is stored if it is greater than the stored maximum value or smaller than the stored minimum value At the same time the display calculates and stores the difference DIFF between the current MIN and MAX values Display Meaning MIN Minimum value from the series of measurements MAX Maximum value from the series of measurements DIFF Difference MIN ACTL Current measured value Starting the measurement series and selecting the display You can start the series of measurements either by pressing MOD and selecting the desired display as described on the following pages or by external signal over the switching inputs at the D sub connection EXT X41 see Switching Inputs and Outputs When a series of measurements is started the internal MIN MAX DIFF memory is reset 1 Only in the linear measurement mode uneven surface Series of measurements The MIN MAX and DIFF values of an 26 Tax TMIN e DIFF 2 Example Measurement series for determining eccentricity e Starting a series of measurements Switching between MIN MAX DIFF and ACTL displays Repeatedly Select the display for a series of meas It is not possible to switch
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