HEIDENHAIN ND 231 B User Manual v.1
ND 231 B
User’s Manual
Measured Value Displays
6/ 2000
Actual value and input display
(9 decades and algebraic sign)
REF SET START PRINT inch
=
<>
21
MIN ACTL MAX DIFF
HEIDENHAIN
Status display with
backlit indicators
Numeric keypad
with decimal point
789
456
MOD
123
.
0
CL
2
Key Function
• Datum setting
• Confirming the entry value
• Setting display to value from P79 (P80!)
• Exiting the parameter list
• Datum selection
• Paging backward in the parameter list
MOD
• 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
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.
/
MAX / Nonfunctional
MIN
DIFF / ACTL /
START
3
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
Items Supplied
Adhesive inserts For stacking the ND 231 B
This Manual describes the ND 231 B measured
value display units with software number
349 797-01
and higher. The software number is shown on a
4
label on the back panel of the housing.
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
Installation and Specifications
Rear Panel, Accessories 13
Mounting 14
Power Connection 15
Operating Parameters 16
List of Operating Parameters 18
Linear Encoders 22
Nonlinear Axis Error Compensation 25
RS-232-C/V.24 (X31) Data Interface 29
Switching Inputs and Outputs EXT (X41) 34
Locking the Keyboard 39
Displaying the Software Version 40
Distance-to-Go Mode 41
Specifications 42
Dimensions 43
Contents
5
Position Encoders and Reference Marks
The ND 231 B display unit is intended for use with photoelectrical linear encoders with sinusoidal 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
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
Position Encoders and Reference Marks
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).
6
refer-
Scale in
linear encoder Distance-coded
reference marks
Reference mark
Reference marks on linear encoders
Switch-on, Traversing the Reference Marks
REF Mode
➤➤
➤
➤➤
0
ENT...CL
5 , 6 9 7
For automation purposes, crossing over the reference marks
and the display ENT ... CL can be disabled with parameter P82.
Turn on the power.
1
(Switch is located on rear panel).
• Units displays ND 231 B
for 2 seconds.
• Unit displays ENT...CL
• 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 points are blinking.
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.
1)
.
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, Traversing the Reference Marks
7
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
Datum Setting
(see P79, P80), or
• By external signal
Select datum 1 or 2.
Enter numerical value (here, 5).
5
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 dimensions.
When you switch back to datum 1, the display unit resumes
display of the MT's actual position.
Z
?
?
?
?
?
Without datum setting: unknown assignment of measured
values to positions
Z
20˜
15˜
10˜
5˜
0
8
After datum setting: Assignment of measured values to
positions
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 parameter P17.
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 SORT Sorting ON/OFF
P18 L.LIMIT Lower sorting limit
P19 U.LIMIT Lower sorting limit
Example: Upper sorting limit = 26.02 mm
Lower sorting limit = 26.00 mm
Accept
Sorting and Tolerance Checking
Rework
Reject
9
Measured Value 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 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 output:
➤➤
➤ Press the MOD key (note the parameter setting P86).
➤➤
or
➤➤
➤ Input the command STX (Ctrl B) over the RXD input of the
➤➤
Measured Value Output
RS-232-C/V.24 interface (X31);
or
➤➤
➤ Input a signal for measured data output (Pulse or Contact)
➤➤
at the D-sub connection EXT (X41).
PC
START PRINT
MOD
in.
123
0.–CL
REF21SET
=
<>
MIN ACTL MAX DIFF
HEIDENHAIN
789
456
The RS-232-C/V.24 interface (X31) enables you to connect a
printer or a PC to your display unit
10
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.
• Frozen display—display value is frozen and is updated with
each signal for measured value output.
• 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 measured values.
Position
Latch
signal
Frozen
display
Display Freeze
Frozen/
concurrent
display
11
Error Messages
Display Problem
RS232 FAST Command for measured value
output followed too quickly by
another.
1)
SIGNAL X1 Encoder signal is too weak.
Error Messages
The scale may be contaminated.
DSR.MISSING The connected device has not sent
a DSR signal.
1)
REF. ERR. X1 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
1)
match.
FRQ.ERR. X1 Input frequency too high for encoder
input. Traversing speed may be too
1)
fast.
MEMORY ERR. Checksum error: Check the datum,
operating parameters and compensation 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:
➤➤
➤ Set a new datum.
➤➤
or
➤➤
➤ Move the axis back.
➤➤
1)
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:
When you have removed the cause of the error:
➤➤
➤ Clear the error message with the CL key.
➤➤
12
Rear Panel
X2
Ports X1, X2, X31 and X41 comply with the
recommendations in EN 50 178 for separation
from line power.
Encoder input X1
HEIDENHAIN flange socket 9-pin
Input signals 11 µA
PP
Maximum encoder cable length 30 m (98.5 ft)
Maximum input frequency 100 kHz
RS-232-C/V.24 data interface (X31)
25-pin D-sub connection (female)
Switching inputs and outputs EXT (X41)
25-pin D-sub connection (male)
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
Power switch
Data interface
Ground
connection
Input X1 for one
HEIDENHAIN
encoder
11 µA
PP
D-sub
connection
Input X2 for one
HEIDENHAIN
encoder
11 µA
PP
Rear Panel, Accessories
13
Mounting
15°
You can fasten the ND 231 B from below by using M4 screws
(see illustration at right).
Mounting
ND 231 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"
Hole positions for mounting the ND display unit
140 ± 0.2
5.51 ± .008"
14
Alternatives of stacking the display units
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