HEIDENHAIN ND 231B User manual

English (en)
12/2001
Measured Value Displays
User’s Manual
ND 231 B
SALES & SERVICE:
A Tech Authority, Inc.
13745 Stockton Ave.
Chino CA 91710
909-614-4522
[email protected]

2
Numeric keypad
with decimal point
Status display with
backlit indicators
Actual value and input display
(9 decades and algebraic sign)
HEIDENHAIN
789
456
123
0.CL
MOD
REF SET START PRINT inch
MIN ACTL MAX DIFF
= <>
21

3
Key Function
 Datum setting
 Confirming the entry value
 Setting display to value from P79 (P80!)
 xiting the parameter list
 Datum selection
 Paging backward in the parameter list
 Outputting the meas. value with PRINT
 Selecting parameters after switch-on
 Paging forward in the parameter list
 Clearing the entry
 Resetting the display to zero (P80!)
 CL plus MOD: Parameter list
 CL plus number: Selecting a parameter
 Clear parameter entry and show
parameter number
 Algebraic sign
 Decreasing the parameter value
 Decimal point
 Increasing the parameter value
MOD
Indicator Meaning
REF If the decimal point is blinking:
Display is waiting for the reference mark
to be traversed.
If the decimal point is not blinking:
Reference mark was traversed—
display unit saves the datum in nonvolatile
memory
Blinking: Display is waiting for operator
to press ENT or CL
inch Position values in inches
1 / 2 Selected datum
PRINT Measured value output with the MOD key
SET Blinking: Display is waiting for entry values
< / = / > Sorting mode: Measured value less than
lower limit / within tolerances / greater
than upper limit.
MIN
/ MAX / Nonfunctional
DIFF / ACTL /
START

4
Items Supplied with ND 231 B
Measured value display unit
ND 231B in benchtop housing
Two 11 µAPP encoder inputs Id. Nr. 344 993-xx
Power cable 3 m (9.9 ft)
User s Manual ND 231 B
Adhesive inserts For stacking the ND 231 B
This Manual describes the ND 231 B measured
value display units with software number
349 797-04
and higher. The software number is shown on a
label on the back panel of the housing.
Items Supplied

5
Installation and Specifications
Rear Panel, Accessories 13
Mounting 14
Power Connection 15
Operating Parameters 16
List of operating parameters 18
Linear Encoders 22
Multipoint Axis Error Compensation 25
Switching Inputs and Outputs EXT (X41) 29
Locking the Keyboard 34
Displaying the Software Version 35
Distance-to-Go Mode 36
RS-232-C/V.24 (X31) Data Interface 37
Input/Output of Parameter and
Compensation Value Lists
Output Format of the Parameter List 44
Output Format of the Compensation-Value Table 48
Remote Operation over the RS-232-C/V.24 51
Data Interface
Specifications 54
Dimensions 55
Contents
Contents
Working with the Display Unit
Position Encoders and Reference Marks 6
Switch-On, Traversing the Reference Points 7
Datum Setting 8
Sorting and Tolerance Checking 9
Measured-Value Output 10
Display Freeze 11
Error Messages 12

6
Scale in
linear encoder Distance-coded
reference marks
Position Encoders and Reference Marks
The ND 231 B display unit is intended for use with photo-
electrical linear encoders with sinusoidal signals: primarily
for HEIDENHAIN MT length gauges with 11 µAPP.
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 refer-
ence 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 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.
If the linear encoders have distance-coded reference marks,
you need only traverse a maximum of 20 mm to restore the
datum (for a signal period of 20 µm).
Reference mark
Reference marks on linear encoders
Position Encoders and Reference Marks

7
Switch-On, Traversing the Reference Marks REF Mode
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.
Turn on the power.
(Switch is located on rear panel).
• Unit displays ND 231 B
for 2 seconds.
• Unit displays ENT...CL 1).
• REF indicator starts 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.
• Decimal points start blinking.
Û
Traverse the reference marks.
Move the plunger until the display starts
counting and the decimal points stop blink-
ing. The display is now ready for operation.
5 , 6 9 7
ENT...CL
0
ä
1
For automation purposes, crossing over the reference marks
and the display ENT ... CL can be disabled with parameter P82.
Switch-On, Traversin the Reference Marks

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:
• Enter a numerical value, or
• Transfer a value from an operating parameter
(see P79, P80), or
• By external signal
Select datum 1 or 2.
After datum setting: Assignment of measured values to
positions
Without datum setting: unknown assignment of measured
values to positions
Z
?
?
?
?
?
Enter numerical value (here, 5).
5
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 MT's actual position.
Datum Settin
Confirm the entered numerical value.

9
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 is
enabled and disabled with operating parameterP17.
Entering sorting limits
Sorting limits are entered in operating parameters P18 and P19
(see “Operating Parameters”).
Sorting signals
The display indicators and switching outputs at D-sub
connection EXT (X41, see applicable section) 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
>Measured value is greater than upper sorting limit
Operating parameters for sorting and tolerance checking
P17 CLASS Sorting ON/OFF
P18 L.CLASS. Lower sorting limit
P19 U.CLASS. Lower sorting limit
Sortin and Tolerance Checkin
Example: Upper sorting limit = 26.02 mm
Lower sorting limit = 26.00 mm
Reject
Accept
Rework

10
HEIDENHAIN
REF 2 1 SET START PRINT in.
MIN ACTL MAX DIFF
= <>
789
456
123
0.–CL
MOD
PC
Measured Value Output
The RS-232-C/V.24 interface (X31) enables you to connect a
printer or a PC to your display unit
Measured alue Output
For technical information on the RS-232-C/V.24 data
interface (X31), information on the data format, etc.,
see the chapter “RS-232-C/V.24 Interface (X31).”
Measured values can be transferred over the RS-232-C/V.24
interface (X31), for example to a printer or PC.
There are several ways to start measured value output:
ä Press the MOD key (note the parameter setting P86).
or
ä Input the command STX (Ctrl B) over the RXD input of the
RS-232-C/V.24 interface (X31);
or
ä Input a signal for measured data output (Pulse or Contact)
at the D-sub connection EXT (X41).