User's Manual ND 281, NDP 281 - heidenhain - DR. JOHANNES ...

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Position Encoders and Reference Marks 6 Position Encoders and Reference Marks The ND 281 and NDP 281 display units are primarily intended for use with photoelectrical linear encoders with sinusoidal 11-µA PP or 1-V PP signals: primarily for HEIDENHAIN MT length gauges with 11 µA PP. These length gauges have one reference mark. The scales of other photoelectric linear encoders (see “Linear Encoders”) can contain one reference mark or several 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 REF reference mark evaluation feature enable the display unit to quickly re-establish 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. If the linear encoders have distance-coded reference marks, you only need to traverse a maximum of 20 mm to restore the datum. Scale in Distance-coded linear encoder reference marks Reference mark Reference marks on linear encoders
Switch-On, Crossing Over the Reference Marks REF Mode 0 ➤ 1 ENT...CL 5 . 6 9 7 ⇔ Turn on power. (Switch located on rear panel.) 1) is displayed. Indicator REF 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 blinking. The display now is ready for operation. For automation purposes, crossing over the reference marks and the display ENT ... CL can be disabled with parameter P82. Crossing over 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 cross over 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. Switch-On, Crossing Over the Reference Marks 7
Page 1 and 2: User's Manual ND 281 NDP 281 Measur
Page 3 and 4: Key Function Set datum Transfer inp
Page 5: Contents Working with the ND Displa
Page 9 and 10: Finding Minimum and Maximum Values
Page 11 and 12: Starting a new series of measuremen
Page 13 and 14: Measured Value Output For technical
Page 15 and 16: Error Messages Display Problem Last
Page 17 and 18: Rear Panel Connections X1, X31 and
Page 19 and 20: Power Connection Electric shock dan
Page 21 and 22: Code number for changing protected
Page 23 and 24: Parameter Settings / Function Linea
Page 25 and 26: Linear Encoders The ND 281 and NDP
Page 27 and 28: Parameter settings for HEIDNHAIN li
Page 29 and 30: Parameter settings for HEIDENHAIN l
Page 31 and 32: Pin layout RS-232-C/V.24 (X31) Pin
Page 33 and 34: Measured value output after signal
Page 35 and 36: Switching Inputs and Outputs EXT (X
Page 37 and 38: Setting and zero resetting the disp
Page 39 and 40: Switching signal for errors The dis
Page 41 and 42: Specifications Housing ND 281 Bench
Page 43 and 44: NDP 281: Dimensions in mm/inches 11

User's Manual ND 281, NDP 281 - heidenhain - DR. JOHANNES ...

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