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
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 mm
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 cord before opening the
housing. Connect the grounding conductor.
Do not interrupt the grounding conductor.
Danger to internal components!
Do not engage or disengage any connections
while the unit is under power. Use only original
replacement fuses.
To increase noise immunity, connect the ground
terminal on the rear panel to the central ground
point of the machine.
(Minimum cross-section: 6 mm
2
)
2
Power Connection
15
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:
• the letter P,
• a two-digit parameter number, and
• an abbreviation.
Example: P01 INCH
Operating Parameters
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:
P00 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
displayed:
Display first user parameter.
MOD
... during operation:
Together:
Display first user parameter.
MOD
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.
16
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 P00 CODE.
➤➤
➤➤
➤ Enter the code number 9 51 48.
➤➤
➤➤
➤ Confirm entry with ENT.
➤➤
Parameter P30.1 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 Key
Page forward
in the list of operating parameters
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
A changed parameter is stored as soon as you
• leave the list of operating parameters
or
• page forward or backward after the change.
MOD
Operating Parameters
17
List of Operating Parameters
Parameter Settings / Function
P00 CODE Enter the code number 9 51 48 to change
the protected operating parameters
P01 Units of measurement
Display in millimeters MM
Display in inches INCH
P06 DISPL. Displayed information
Signals from encoder at X1 DISPLAY X1
Signals from encoder at X2 DISPLAY X2
Sum display X1 + X2 X1 ADD. X2
Difference display X2 – X2 X1 SUB. X2
List of Operating Parameters
P11 SCL Scaling factor
Scaling factor on SCALING ON
Scaling factor off SCALNG. OFF
P12.1 SCL Scaling factor X1
Enter a numerical value
0.100000 < P12 < 9.999999
Default setting: 1.000000
P12.2 SCL Scaling factor X2
Enter a numerical value
0.100000 < P12 < 9.999999
Default setting: 1.000000
18
Parameter Settings / Function
P17 SORT Sorting and tolerance checking
Sorting and tol. checking ON SORT ON
1)
P18 L.LIMIT Lower limit for sorting
P19 U.LIMIT Upper limit for sorting
P23 DISPL. Display stop for measured value output
P30.1 DIR Counting direction X1
P30.2 DIR Counting direction X2
Sorting and tol. checking OFF SORT OFF
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
Positive counting direction with
positive direction of traverse DIRECT. POS
Negative counting direction with
positive direction of traverse DIRECT. NEG
Positive counting direction with
positive direction of traverse DIRECT. POS
Negative counting direction with
positive direction of traverse DIRECT. NEG
Parameter Settings/ Function
P31.1 S. PER.Signal period of encoder X1
0.000 000 01 < P31 < 99 999.9999
Default setting: 10 µm
P31.2 S. PER.Signal period of encoder X1
0.000 000 01 < P31 < 99 999.9999
Default setting: 10 µm
P33.1 COUNT Counting mode X1
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
P33.2 COUNT Counting mode X2
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
P38.1 DP POS Decimal places X1
1)
1 / 2 / 3 / 4 / 5 / 6
(up to 8 for inch display)
P38.2 DP POS Decimal places X2
1)
1 / 2 / 3 / 4 / 5 / 6
(up to 8 for inch display)
P40.1 COMP. Select encoder compensation X1
No compensation COMP. OFF
Nonlinear: up to 64
compensation points NONL. COMP
Linear compensation COMP. ON
Parameter Settings/ Function
P40.2 COMP. Select encoder compensation X2
No compensation COMP. OFF
Nonlinear: up to 64
compensation points NONL. COMP
Linear compensation COMP. ON
P41.1 L.COMP.Linear error compensation X1
– 99 999.9 < P41 < + 99 999.9 [µm/m]
Default setting: 0
Example: Find input value for P41
Displayed measuring length ............. L
= 620.000 mm
a
Actual length (measured, e.g.
with the VM 101 comparator
system from HEIDENHAIN) ..............L
= 619.877 mm
t
Length difference ............................. ∆L = L
Compensation factor k (= P41):
k = ∆L / La = – 123 µm / 0.62 m........ k = – 198.4 [µm/m]
P41.2 L.COMP.Linear error compensation X2
– 99 999.9 < P41 < + 99 999.9 [µm/m]
Default setting: 0
1)
Depends on signal period (P31) and measuring unit (P01)
1)
– La = – 123 µm
t
List of Operating Parameters
19
Parameter Settings / Function
P43.1 REF Reference marks X1
One reference mark SINGLE REF.
Distance-coded with 500 • SP
(SP: signal period) 500 SP
Distance-coded with 1000 • SP
(e.g. for HEIDENHAIN LS ...C) 1000 SP
Distance-coded with 2000 • SP 2000 SP
Distance-coded with 5000 • SP 5000 SP
P43.2 REF Reference marks X2
One reference mark SINGLE REF.
List of Operating Parameters
P44.1 REF Reference mark evaluation
1)
If an encoder input is unoccupied, it must be deactivated.
The settings go into effect after switch-on.
Distance-coded with 500 • SP
(SP: signal period) 500 SP
Distance-coded with 1000 • SP
(e.g. for HEIDENHAIN LS ...C) 1000 SP
Distance-coded with 2000 • SP 2000 SP
Distance-coded with 5000 • SP 5000 SP
Evaluate the reference mark REF. X1 ON
Do not evaluate the reference
mark REF. X2 OFF
20
Parameter Settings / Function
P44.2 REF Reference mark evaluation
Evaluate the reference mark REF. X2 ON
Do not evaluate the reference
mark REF. X2 OFF
P45.1 ALARM Encoder monitoring X1
No monitoring ALARM OFF
Monitor the frequency FREQUENCY
Monitor contamination CONTAMINAT.
Contamination + frequency FRQ. + CONT.
P45.2 ALARM Encoder monitoring X2
No monitoring ALARM OFF
Monitor the frequency FREQUENCY
Monitor contamination CONTAMINAT.
Contamination + frequency FRQ. + CONT.
P50 RS232 Baud rate
110 / 150 / 300 / 600 / 1200 /
2400 / 4800 / 9600 / 19 200 /
38 400 baud
P51 RS232 Additional blank lines
during data output BK LINE 1
0 ≤ P51 ≤ 99
Default setting: 1
1)
Parameter Settings / Function
P62 A1 Trigger limit 1
P63 A2 Trigger limit 2
P79 PRESET Value for datum point
Enter numerical value for
datum setting over switching input
or with ENT key
P80 ENT-CL Set display
No set/Set with
CL/ENT CL-ENT OFF
Zero reset with CL
setting disabled with ENT CL......ON
Zero reset with CL and set with
ENT to value selected in P79 CL-ENT ON
P82 DISPL.ON Message after switch-on
ENT...CL message MESSAGE ON
No message MESSG. OFF
P85 EXT.REF External REF
REF over D-sub port EXT EXT.REF ON
No REF over D-sub port EXT EXT.REF OFF
Parameter Settings / Function
P86 MOD Print via MOD key
PRINT via MOD disabled PRINT OFF
PRINT via MOD enabled PRINT ON
P98 LANGUA. Conversational language
German LANGUAGE D
English LANGUAGE GB
French LANGUAGE F
Italian LANGUAGE I
Dutch LANGUAGE NL
Spanish LANGUAGE E
Danish LANGUAGE DK
Swedish LANGUAGE S
Finnish LANGUAGE FI
Czech LANGUAGE CZ
Polish LANGUAGE PL
Hungarian LANGUAGE H
Portuguese LANGUAGE P
List of Operating Parameters
21
Linear Encoders
The ND 231 B display unit is designed for use together with
photoelectrical encoders with 11 µA
Display step with linear encoders
You can select a specific display step by adapting the
following operating parameters:
Linear Encoders
• Subdivision (P31)
• Counting mode (P33)
• Decimal places (P38)
Example
Linear encoder with a signal period of 10 µm
Desired display step................. 0.000 5 mm
Subdivision (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.
sinusoidal signals.
PP
22
Recommended parameter settings for HEIDENHAIN linear encoders with 11 µA
Model
CT
MT xx01
LIP 401A/401R
2
Reference
marks
Signal periods
in µm
P31
P 43
Single 0.0005
Single
Millimeters Inches
Display
step
in mm
0.0002
0.0001
0.00005
Count
mode
P 33 P 38
5
2
1
5
4
4
4
5
Decimal
Display
step
in inches
places
0.00002
0.00001
0.000005
0.000002
Recommd. only for LIP 401
LF 103/103C
LF 401/401C
LIF 101/101C
LIP 501/501C
LIP 101
0.00002
0.00001
0.000005
4
Single/5000 0.001
0.0005
0.0002
0.0001
Single
0.00005
2
1
5
1
5
2
1
5
5
5
6
3
4
4
4
5
0.000001
0.0000005
0.0000002
0.00005
0.00002
0.00001
0.000005
0.000002
Recommd. only for LIP 101
0.00002
0.00001
MT xx 10 Single 0.0005
0.0002
0.0001
LS 303/303C
LS 603/603C
20 Single/1000 0.01
0.005
2
1
5
2
1
1
5
5
5
4
4
4
2
3
0.000001
0.000000515
0.00002
0.00001
0.000005
0.0005
0.0002
signals
PP
Count
mode
P 33 P 38
2
1
5
2
1
5
2
5
2
1
5
2
2
1
5
5
2
Decimal
places
5
5
6
6
6
7
7
5
5
5
6
6
6
7
5
5
6
4
4
Linear Encoders
23
Recommd. parameter settings for HEIDENHAIN linear encoders with 11 µAPP signals (continued)
Signal period
in µm
Reference
marks
P31
P 43
Single/1000
-
Millimeters Inches
Display
step
in mm
Count
mode
Decimal
P 33 P 38
0.001
0.0005
0.005
0.002
0.001
0.0005
1
5
5
2
1
5
3
4
3
3
3
4
Model
LS 106/106C
Linear Encoders
LS 406/406C
LS 706/706C
ST 1201
LB 302/302C
LIDA 10x/10xC
20
40 Single/2000
Recommd. only for LB 302
0.0002
0.0001
LB 301/301C 100 Single/1000 0.005
0.002
0.001
LIM 102 12800 Single 0.1
0.05
Example
Your length gauge: MT 101
Desired display step: 0.0005 mm (0,5 µm)
Parameter settings: P01 = mm, P43 = single, P31 = 10, P33 = 5, P38 = 4
2
1
5
2
1
1
5
4
4
3
3
3
1
2
Display
step
in inches
places
0.00005
0.00002
0.0002
0.0001
0.00005
0.00002
0.000001
0.000000515
0.0002
0.0001
0.00005
0.005
0.002
Count
mode
Decimal
P 33 P 38
5
2
2
1
5
2
2
1
5
5
2
5
5
4
4
5
5
5
6
4
4
5
3
3
places
24
Nonlinear Axis Error Compensation
If you want to use the nonlinear axis error
compensation feature, you must:
• Activate the feature with operating parameter
40 (see “Operating Parameters”),
• Traverse the reference marks after switching
on the display unit,
• enter a 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).
An axis can be error-compensated only with respect to an
error-causing axis. A compensation table with a total of up to
64 compensation values can be entered for every axis.
You select the compensation table through P00 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.
The letter “R.1” or “R.2” at the left of the display indicates that
the displayed position value is given with respect to the reference mark. If “R.1” or “R.2” blinks, you must traverse the
reference mark.
Entries in the compensation value table
• Axis to be error-compensated: X1 or X2
• Error-causing axis: X1 or X2
• Datum:
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.
• Spacing of the compensation points:
The spacing of the compensation points is expressed as:
Spacing = 2
Enter the value of the exponent
value table.
Minimum input value: 6 (= 0.064 mm)
Maximum input value: 20 (= 1048.576 mm)
Example: 900 mm traverse with 15 compensation points
==> 60.000 mm spacing between points.
Nearest power of two: 2
“Table for determining the point spacing”)
Input value in the table: 16
• Compensation value:
You enter the measured compensation value (in millimeters) for the displayed compensation point. Compensation point 0 always has the value 0 and cannot be changed.
x
[µm].
x
into the compensation
16
= 65.536 mm (see
Nonlinear Axis Error Compensation
25
Table for determining the point spacing
Exponent Point spacing
in mm in inches
6 0.064 0.0023“
7 0.128 0.0050“
8 0.256 0.0100“
9 0.512 0.0200“
10 1.024 0.0403“
11 2.048 0.0806“
12 4.016 0.1581“
13 8.192 0.3225“
14 16.384 0.6450“
15 32.768 1.290“
16 65.536 2.580“
17 131.072 5.160“
18 262.144 10.32“
19 524.288 20.64“
20 1048.576 41.25“
Nonlinear Axis Error Compensation
26
Selecting the compensation table, entering an axis correction
Together
with
Select the operating parameters.
MOD
Select P00 CODE.
P00 CODE
Enter the code number 10 52 96,
confirm with ENT.
AXIS X1
MOD
Select the axis whose error is to be
compensated (X1 or X2). Press MOD to
go to the next input box.
X1 FCT. X1 or X1 FCT X2
MOD
Select the error-causing axis (X1 or X2).
Press MOD to select the datum.
DATUM X1 or X2 (shown for approx. two seconds)
MOD
Enter the active datum for the error on
the axis to be compensated, e.g. 27 mm.
Press MOD to select the next input box.
SPACING
4 x
MOD
COMP. NR. 01
2 x
MOD
COMP. NR. 02
2 x
MOD
Enter the spacing of the compensation
points on the axis to be corrected, for
example 210 µm (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.)
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).
Nonlinear Axis Error Compensation
Enter all further compensation points.
If you want so select a compensation
point directly, press CL and
simultaneously enter the desired
compensation point number.
Conclude entry.
27
Deleting a compensation value table
Together
with
P00 CODE
AXIS X1
Nonlinear Axis Error Compensation
DELETE X1 OR X2
Select the operating parameters.
MOD
Select P00 CODE.
Enter the code number 10 52 96,
confirm with ENT.
Select the compensation value table
(axis X1 or X2).
Select the “delete” function.
Confirm with ENT or cancel with CL.
Exit the compensation table mode.
28
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 connecting 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)
Full wiring
ND
CHASSIS
SIGNAL
ND
CHASSIS
TXD
RXD
RTS
CTS
DSR
GND
DTR
TXD
RXD
RTS
CTS
DSR
GNDSIGNAL
DTR
2
3
4
5
6
7
20
11GND
2
3
4
5
6
7
20
SIGNAL
TXD
RXD
RTS
CTS
DSR
GND
DTR
GND
CHASSIS
RS-232-C/V.24 Data Interface (X31)
1GND
2
3
4
5
6
7
20
CHASSIS
1 GND
2
3
4
5
6
7
20
TXD
RXD
RTS
CTS
DSR
GNDSIGNAL
DTR
Simplified wiring
29
Pin layout RS-232-C/V.24 (X31)
Data format and control characters
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
8 to 19 –
20 DTR Data terminal ready
21 to 25 –
RS-232-C/V.24 Data Interface (X31)
Levels for TXD and RXD
Logic level Voltage level
Active – 3 V to – 15 V
Not active + 3 V to +15 V
Levels for RTS, CTS, DSR and DTR
Logic level Voltage level
Active + 3 V to + 15 V
30
Not active – 3 V to – 15 V
Not assigned
Not assigned
Data format 1 start bit
7 data bits
Even parity bit
2 stop bits
Control characters Call measured value: STX (Ctrl B)
Interrupt DC3 (Ctrl S)
Continue DC1 (Ctrl Q)
Interrogate error message: ENQ (Ctrl E)
Example: Data sequence during measured value output
Measured value = – 5.23 mm
The measured value is within the sorting limits ( = ) and is the
current value ( A ) of a series of measurements.
Measured value output
- 5 . 2 3 = A < C R > < L F >
12 3456 7 8
1
Algebraic sign
2
Numerical value with decimal point (10 characters on
the whole, leading zeros are output as blank spaces.)
3
Blank space
4
Unit: Blank space = mm; " = inch; ? = fault
5 Sorting status (<, >, =; ? if P18 > P19)
or blank space
6
Axis designation (1 = X1, 2 = X2, A = X1 + X2,
S = X1 – X2)
7
CR (carriage return)
8
LF (line feed)
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
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
➤➤
➤ Press the MOD key (note parameter setting P86).
➤➤
Duration of measured value transfer
187 + (11 • number of blank lines)
t
=[ s]
D
baud rate
RS-232-C/V.24 Data Interface (X31)
31
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
EXT(X41)
Pin 23
Pin 1(0V)
EXT(X41)
Pin 22
Pin 1(0V)
Process Time
Minimum duration of “Contact” signal te ≥ 7 ms
Minimum duration of “Pulse” signal te ≥ 1.5 µs
Storage delay after “Contact” t1 ≤ 5 ms
RS-232-C/V.24 Data Interface (X31)
Storage delay after “Pulse” t1 ≤ 1 µs
Measured value output after t2 ≤ 57 ms
Regeneration time t3 ≥ 0
Duration of measured value transfer
187 + (11 • number of blank lines)
= [s]
t
D
baud rate
32
Triggering the “Contact” and “Pulse” inputs at D-sub
connection EXT (X41)
t
e
t
1
t
2
t
D
t
e
t
3
Signal transit times for measured value output after “Pulse”
or “Contact”
Measured value output after “STX” signal (Ctrl B)
t
1
t
2
Ctrl B
t
D
t
3
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 t1 ≤ 1ms
Measured value output after t2 ≤ 50 ms
Regeneration time t3 ≥ 0
10 L%=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$<>""THEN 130
70 C%=LOC(1)
80 IF C%<L%THEN 60
90 X$=INPUT$(L%,#1)
100 LOCATE 9,1
110 PRINT X$;
120 GOTO 50
130 END
BASIC program for measured value output with “Ctrl B”
Duration of measured value transfer
187 + (11 • number of blank lines)
t
= [s]
D
baud rate
RS-232-C/V.24 Data Interface (X31)
Propagation times for measured value output after “Ctrl B”
33
Switching Inputs and Outputs EXT (X41)
Inputs at D-sub connection EXT (X41)
Danger to internal components!
Voltage sources for external circuitry must conform
to the recommendations in EN 50 178 for lowvoltage 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 ≥ trigger limit A1 (P62)
16 Measured value ≥ trigger limit A2 (P63)
Switching Inputs and Outputs EXT (X41)
17 Measured value < lower sorting limit (P18)
18 Measured value > upper sorting limit (P19)
19 Error (see “Error Messages”)
Pin Function
1, 10 0 V
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
8 Display MAX value of series of measurements
9 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
11, 20, 21
Do not assign
Vacant
1)
1)
34
Inputs
Outputs
Input signals
Internal pull-up resistor 1 kΩ, 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: td ≤ 2ms
Minimum pulse duration for all signals: t
≥ 30 ms
min
Signal level of inputs
Status Level
High + 3.9 V ≤ U ≤ + 15 V
Low – 0.5 V ≤ U ≤ + 0.9 V; I ≤ 6 mA
E
0V
E
0V
t
min
t
min
≥ 30 ms
Output signals
Open collector outputs, active with low level
Delay until signal output: td ≤ 30 ms
Signal duration of zero signal, trigger limit A1, A2: t0 ≥ 180 ms
Signal level of outputs
Status Level
High U ≤ + 32 V; I ≤ 10 µA
Low U ≤ + 0.4 V; I ≤ 100 mA
I ≤ 100 mA
+ UB ≤ 32 V
C
B
U
CE
E
Pin 1.10
0 V
Switching Inputs and Outputs EXT (X41)
35
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 switched 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 or pin 24) is active, the display will ignore all
Switching Inputs EXT (X41)
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.
Selecting the display information
You can select the display information of the ND 231 B
• through switching inputs (see D-sub connection EXT) or
• with the operating parameters P06 (see Operating
Parameter list).
If you use the switching inputs, the setting of P06 has no
influence on the display information.
If none of the inputs for the selection of display information
(pin 6 to pin 9) is active, or if more than one is active, then the
settings of the operating parameter P06 apply:
• Position if the encoder on X1: P06 = DISPLAY X1
• Position if the encoder on X2: P06 = DISPLAY X2
• Sum display: P06 = X1 ADD. X2
• Difference display: P06 = X1 SUB. X2
36
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 are exceeded, the
corresponding outputs (pins 17, 18) are activated.
Output
Switching point
Measured value < lower sorting limit
Path
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.
Measured value > Upper
sorting limit
Lower limit Upper limit
Path
Weg
Path
5
t
Pin 15
(A1)
t
d
t
v
t
t
d
v
t
Time curve of signal at pin 15 for trigger limit (A1) = 5 mm , td ≤ 30 ms
Switching Inputs EXT (X41)
37
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.
Switching Outputs EXT (X41)
ERROR xx
Error
38
Locking the Keypad
You can disable or re-enable the keypad by entering the code
number 24 65 84:
➤ Select the user parameter P00 CODE (see “Operating
Parameters”).
➤ Enter the code number 24 65 84.
➤ Confirm the entry with ENT.
➤ With the “•” or “–” key, select KEYS ON or
KEYS OFF.
➤ Confirm your selection with ENT.
If the keypad is locked, you can select only the datum or P00
CODE through the MOD key.
Locking the Keypad
39
Displaying the Software Version
To display the software version of the display unit, enter the
code number 66 55 44:
➤ Select the user parameter P00 CODE.
➤ Enter the code number 66 55 44.
➤ 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.
➤ To exit the software version display mode, press ENT.
Displaying the Software Version
40
Distance-to-Go Display Mode
1)
Function of switching outputs A1 and A2
Normally, the display shows the actual position of the encoder.
However, it is often more helpful to display the remaining
distance to an entered nominal position— especially when you
are using the display unit for machine tools and automation
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.
➤➤
➤ Move the axis until the display value is zero.
In the distance-to-go mode, switching outputs A1 (pin 15) and
A2 (pin 16) have a different function: they 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
and –10 mm. The figure below shows output signal A1 when
approaching zero from the negative direction.
Ð10
0
+10
Path
Pin 15
(A1)
t
t
d1
v1
t
t
d2
v2
t
Time curve of a signal for switching limit (A1) = 10 mm , t
ms, t
≤ 180 ms
d2
d1
≤ 30
Distance-to-Go Mode
41
Specifications
Housing ND 231 B
Benchtop design,
cast-metal housing (W · H · D)
239 mm · 84.6 mm · 224 mm
Operating temperature 0° to 45° C (32° to 113° F)
Specifications
Storage temperature –20 °C to 70 °C (–4 °F to 158 °F)
Weight Approx. 1.5 kg (3.3 lb)
Relative humidity < 75% annual average
< 90% in rare cases
Power supply Primary-clocked power supply
100 Vac to 240 Vac
(–15% to +10%)
50 Hz to 60 Hz (± 2 Hz)
Line fuse F 1 A inside the housing
Power consumption 8 W (typically)
Electromagnetic
compatibility Class B according to EN 55022
Noise immunity As per VDE 0843 Parts 2 and 4,
severity 4
Protection IP40 according to IEC 529
Encoder inputs For encoders with sinusoidal output
signals (11 µA
Reference mark evaluation for distancecoded and single reference marks
Input frequency X1 and X2:
Max. 100 kHz for 30 m cable length
Display step Adjustable
Datum points Two
Functions • 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 Baud rates:
Interface 110, 150, 300, 600, 1200, 2400,
4800, 9600, 19 200, 38 400 baud
PP
);
42
ND 231 B: Dimensions in mm/inches
1
SET START PRINT2 inch
REF
< = >
MIN ACTL
MAX DIFF
X
Specifications
35
1.43"
325
33.5
1.37"
12.8"
172 ± 0.2
6.77" ± .008"
239
9.41"
140 ± 0.2
5.51" ± .008"
224
8.82"
43
DR. JOHANNES HEIDENHAIN GmbH
Dr.-Johannes-Heidenhain-Straße 5
83301 Traunreut, Germany
{ +49/8669/31-0
| +49/8669/5061
e-mail: info@heidenhain.de
{ Service
{ TNC-Service
|+49/8669/98
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
| (01444) 870024
+49/8669/
+49/8669/
99
31-12 72
31-14 46
44
350 274-21 · SW 349 797-01 · 2 · 6/2000 · E · Printed in Germany · Subject to change without notice
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