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HEIDENHAIN ND 231 Working Instruction

Measured value display unit
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HEIDENHAIN
Working with the measured
value display unit
Actual value and input display
(7-segment LED,
9 decades and sign)
REF
<
=
HEIDENHAIN
Status display
• Output measured value over data
interface (P86!)
• Go to parameter list after switch-on
• Page forward in parameter list
Indicator
REF
in.
1 /
2
SET
< / = / >
• Select datum
• Page backward in
1
2
SET
>
Meaning
If decimal points are blinking:
Display is waiting for the reference mark to be crossed over.
If decimal points are not blinking:
Reference marks crossed over – datum points are now stored in
nonvolatile memory.
Blinking: Waiting for operator to press ENT or CL.
Position values displayed in inches.
Datum point 1 / Datum point 2 currently active.
Blinking: Waiting for operator to confirm entry values.
Sorting mode: Measured value less than lower limit / within
tolerances / greater than upper limit.
ND 231
parameter list
in.
• Clear entry
• Reset to zero (P80!)
• CL plus MOD:
parameter list
• CL plus 2-digit num-
ber: select parameter
• Clear parameter entry
and show parameter
number
• Confirm entry value
• Set display to value from
P79 (P80!)
Numeric keypad
7
8
9
4
5
6
1
2
3
MOD
.
–
CL
0
• Algebraic
sign
• Decrease
parameter
value
• Decimal point
• Increase pa-
rameter value

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Summary of Contents for HEIDENHAIN ND 231

  • Page 1 HEIDENHAIN Working with the measured ND 231 value display unit • Confirm entry value • Set display to value from Actual value and input display • Select datum P79 (P80!) (7-segment LED, • Page backward in 9 decades and sign)

  • Page 2: Datum Setting

    The ND 231 measured value display unit is designed for use with two HEIDENHAIN linear or rotary encoders with sinusoidal output signals. Each encoder has one reference mark or several reference marks, which may also be distance-coded . When a reference mark is crossed over, it generates a signal identify- ing that position as a reference point.

  • Page 3: Selecting The Display

    Selecting the Display You select the display for the ND 231 with • switching inputs (see D-sub connection EXT) or • operating parameter P06 (see list of operating parameters). If you select the display over the switching inputs, operating parameter P06 has no effect on the display.

  • Page 4: Data Output

    Input the command STX (Ctrl B) over the RXD input Input a latch command over the D-sub connection EXT. A connecting cable (for example to a PC) is available from HEIDENHAIN (Id.-Nr. 274 545 ..). Cables up to 20 m (66 ft) are permitted.
  • Page 5 D-sub connection EXT Danger to internal components! Voltage sources from 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. Use only shielded cable! Connect the shield to the connector housing.

  • Page 6: Error Messages

    Internal counter overflow Error while crossing over reference marks To clear the error message: Switch off the display unit. Should any of these error codes recur, contact your HEIDENHAIN service agency. Offset compensation values for encoder signals have been erased: contact your HEIDENHAIN service agency.

  • Page 7: Operating Parameters

    Operating Parameters The parameters are divided into “user parameters“ and “protected operating parameters," which can only be accessed by entering a code number. User parameters User parameters are operating parameters that you can change without entering the code number: They are designated P00 to P30, P50, P51, P79, P86 Calling user parameters To call user parameters immediately after switch-on: Press the MOD key as long as...
  • Page 8 Example entry value for P41 Displayed length: L d = 620.000 mm; Actual length (determined e.g. with a comparator system VM 101 from HEIDENHAIN): L a = 619.876 mm; Length difference: ∆L = L a – L d = –124 µm...
  • Page 9 Parameter Settings for HEIDENHAIN Linear Encoders Model P 43 Display step The following settings (unit: P01) apply for mm: inches Subdi- Count. Decimal vision mode places single 0,0005 0,00002 MT xx01 0,0002 0,00001 0,0001 0,000005 LIP 401 none 0,00005 0,000002...

  • Page 10: Rear Panel

    RS-232-C/V.24 100 ... 240 V 50 ... 60 Hz Power switch Ground terminal Inputs for HEIDENHAIN linear encoders with sinusoidal output signals (7µA to 16 µA connecting cable max. 30 m (98.5 ft), input frequency max. 100 kHz Interfaces X1, X2, X31 and X41 comply with the recommendations in EN 50 178 for separation from line power.

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