HEIDENHAIN ND 282 B User Manual

User’s Manual

ND 282

Measured Value
Displays

English (en)
4/2001

B

Display of actual value and input

(8 decades with algebraic sign)

REF SET START PRINT inch

=

<>

21
MIN ACTL MAX DIFF

HEIDENHAIN

Status display with indicators

Numeric keypad
with decimal point

789

456

MOD

123

.

0

CL

2

Key Function

• Set datum

• Transfer input value

• Set display to value from P79 (P80!)

• Leave parameter list

• Select datum

• Page backwards in parameter list

MOD

• Start series of measurements

• Switch display for measurement series

• Start measured value output “PRINT”

• Select parameter after switch-on

• Page forward in parameter list

• Delete entry

• Set display to zero (P80!)

• CL plus MOD: select parameter list

• CL plus number: select parameter

• Algebraic sign

• Reduce parameter value

• Decimal point

• Increase parameter value

Indicator Meaning

REF If the decimal points are also blinking:

Display is waiting for reference mark
traversing. If decimal points are not blinking:
Reference mark has been traversed—display
stores datum points in nonvolatile memory
Blinking: display is waiting for ENT or
CL to be depressed

inch Position values in inches

1 / 2 Selected datum point

PRINT Blinking: Display is waiting for ENT to

be pressed for data output

SET Blinking: Display is waiting for input values

< / = / > Sorting and tolerance checking:

measured value smaller than lower limit /
within the limits / greater than upper limit

MIN

/

MAX / Series of measurements: Minimum /

DIFF / ACTL

START Series of measurements is running

maximum / greatest difference (MAX–MIN) /
current measured value
Blinking: Confirm selection or deselect
function

Blinking: Display is waiting for signal to
start series of measurements

3

Items supplied with ND 282 B

ND 282 B Measured value display unit,

benchtop model

Encoder input 11 µA

Power cord 3 m (9.9 ft)

User's Manual ND 282 B

Items Supplied

Adhesive plug-in feet For stacking ND 282 B units

This manual is for the ND 282 B measured value
display with the following software number or higher:

PP

354 394-01

Id. Nr. 344 998-xx

The software number is indicated on a label on the

4

rear panel.

Contents

Working with the ND Display Units

Encoders and Reference Marks 6

Switch-On, Traversing the Reference Marks 7

Datum Setting 8

Finding Minimum and Maximum Values 9

Sorting and Tolerance Checking 12

Measured Value Output 13

Error Messages 15

Installation and Specifications

Rear Panel, Accessories 16

Mounting 17

Power Connection 18

Operating Parameters 19

List of Operating Parameters 21

Linear Encoders 24

BCD Interface (X33) 27

Switching Inputs and Outputs EXT (X41) 29

Distance-to-Go Mode 34

Displaying the Software Version 35

Locking the Keypad 36

Specifications 37

Dimensions 38

Contents

5

Position Encoders and Reference Marks

The ND 282 B display unit is designed for use with photo­electrical linear encoders with 11 µA
primarily for HEIDENHAIN MT length gauges with 11 µA

The MT length gauges have one reference mark. The scales
of other photoelectric linear encoders (see “Linear Encod­ers”) can contain one reference mark or many

reference marks.

coded

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 be-

Position Encoders and Reference Marks

tween length gauge position and display values which you
last defined by setting the datum.

To restore the datum on scales with distance-coded refer-
ence marks, you only need to traverse a maximum of 20 mm
for linear encoders.

sinusoidal signals:

PP

distance-

PP

.

Scale in Distance-coded
linear encoder reference marks

Reference mark

Reference marks on linear encoders

6

Switch-On, Traversing the Reference Marks

REF Mode

ä

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 located on rear panel.)

• ND 282 B appears for two seconds.

• ENT ... CL

• REF indicator is blinking.

• Data interface shows error 7.

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 blink-

Û

ing. The display is now ready for operation.

1)

appears.

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 traverse 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

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 actual position of the MT.

SET blinks.

Confirmthe entered numerical value.

Z

?

?

?

?

?

Without datum setting: unknown assignment of measured
values to positions

8

After datum setting: Assignment of measured values to
positions

Finding Minimum and Maximum Values from a
Series of Measurements

After a series of measurements has been started, the display
transfers the first measured value to the memory for minimum
and maximum values. Every 0.55 ms, the display compares the
current measured value with the memory contents: A new
value is stored if it is greater than the stored maximum value or
smaller than the stored minimum value. At the same time, the
display calculates and stores the difference DIFF between the
current MIN and MAX values.

Display Meaning

MIN Minimum value from the series of measurements

MAX Maximum value from the series of measurements

DIFF Difference MAX – MIN

ACTL Current measured value

MAX

ACTL

Series of measurements: The MIN, MAX and DIFF values of an
uneven surface

DIFF

MIN

Starting the measurement series and selecting the display

You can start the series of measurements either by pressing
MOD and selecting the desired display—as described on the
following pages—or by external signal over the switching
inputs at the D-sub connection EXT (see section on X41).

When a series of measurements is started, the internal MIN/
MAX/DIFF memory is reset.

Example: Measurement series for determining eccentricity

Finding Minimum and Maximum Values

e

9

Starting a series of measurements

Switching between MIN, MAX, DIFF and ACTL displays

Repeatedly

MOD

MAX

Repeatedly

Select the display for a series of meas­urements.

The selected indicator blinks (here, MAX).

Confirm selection.

... until the START indicator blinks.

MOD

START

Start the series of measurements.

Finding Minimum and Maximum Values

Indicator preselection

Press MOD to start the series of measurements and select the
display with the indicators.

Operating parameter P86 allows you to define which indicator
is displayed first when MOD is pressed.

It is not possible to switch between the displays as
described below if the switching input for external
control of the series of measurements (pin 6 on
D-sub connection EXT) is active.

As an alternative, you can select the display with operating
parameter P21 (see “Operating Parameters”).

Repeatedly

MOD

MIN

The display now shows the smallest value measured during the
current series of measurements.

Select the new display of a series of
measurements.

The selected indicator blinks (here, MIN).

Confirm the change.

10

Starting a new series of measurements

Repeatedly

MOD

START

Ending a series of measurements

Repeatedly

MOD

or

Repeatedly

MOD

START

Select the indicator START.

The indicator START blinks.

Start a new series of measurements.

Select the active indicator (MIN, ACTL,
MAX, DIFF).

The indicator that lit up last blinks.

End the series of measurements.

Select the indicator START.

The START indicator blinks.

Finding Minimum and Maximum Values

End the series of measurements.

11

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 indicators and switching outputs at D-sub connection
EXT (see section on X41) sort the display value into one of
three classes.

Sorting and Tolerance Checking

Display Meaning

= Measured value is within sorting limits

< Measured value is smaller than lower sorting

limit

> Measured value is greater than upper sorting

limit

Part 1

Accept

Part 2

Rework

12

Operating parameters for sorting and tolerance
checking

P17 CLASS. Sorting ON/OFF

P18 L.CLASS. Lower sorting limit

P19 U.CLASS. Upper sorting limit

Part 3

Reject

Example: Upper sorting limit = 26.02 mm

Lower sorting limit = 26.00 mm

Measured Value Output

For technical information on the BCD data inter­face (X33), information on the data format, etc.,
see the chapter “BCD Interface (X33).”

Measured values can be output over the BCD interface (X33).

There are several ways to start measured value output:

ä

Press MOD repeatedly until the PRINT indicator blinks
(only for“slow” data output), then start data output with
ENT;

or

ä

Let the measured values periodically be sent to the data
output;

or

ä

Input a latch command at the D-sub connection EXT;

or

ä

Input a latch command at the BCD connection.

Interface Operating Mode (see Operating Parameter P53)

slow– Display value
fast – Display value referenced to datum 1

(MIN/MAX/DIFF display values are not shown)

Measured Value Output

13

Data Output and Display Freeze with Measured Value Output

The effect of the measured value output signal on the data output is determined
with operating parameter P55.

• Concurrent, no display freeze: The data output ignores latch commands
and always displays the current measured value (BCD ACTL.).

• Frozen / hold: Data output is stopped and the measured value is retained until

the next signal for measured value output arrives (BCD HOLD).

• Frozen/concurrent: Data output remains frozen as long as the latch signal is

present; with the signal off, the display again shows the current measured
values (BCD STOP).

Measured Value Output

Parameter P23 determines if the display value is equal to the measured value
(DISPL. ACTL.) or equal to the data output value (DISPL. BCD).

Position

Latch
signal

Frozen
data output

14

Frozen/
concurrent
data output

Error Messages

Display

Display Effect/Cause BCD Output

BCD SPEED Last measured value not yet 01

called (with external data
requesting).

1)

NO RES.PRES Illegal attempt to set or zero reset. 04

The display will not be set
or zero reset.

1)

OVERFLOW Input value not displayable 12

(input through keys or external
setting).

1)

Internal counteroverflow 53
(BCD counter).

1)

SIGNAL Encoder signal is too weak. 50

The scale may be contaminated.

1)

FREQUENCY Input frequency too high for encoder 51

input. Traversing speed may be
too fast.

1)

ERR. REF. The spacing of the reference marks 55

as defined in P43 is not the actual
spacing.

1)

2)

Display Effect/Cause BCD Output

ERR. MEMORY Checksum error: Check the datum, 80

operating parameters and compen­sation values for non-linear 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 the D-sub connection EXT is active.

2)

Active with P84: ERROR ON
The ND sends the error message to the BCD output on

the first and second decades. All other decades receive the
ASCII character “A“ (1010).

Other Error Displays

If “OVERFLOW” appears, the measured value is too large or
too small:

ä

Set a new datum.

or

ä

Traverse back.

If all sorting signals light up, the upper sorting limit is
smaller than the lower limit:

ä

Change operating parameters P18 and/or P19.

To clear error messages:

Once you have removed the cause of the error:

ä

Clear the error message with the CL key.

Display

2)

Error Messages

15

Rear Panel

Ports X1, X33 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

Maximum encoder cable length 30 m (98.5 ft)

Rear Panel, Accessories

Maximum input frequency 50 kHz

BCD data interface (X33)

“AMP-CHAMP” connection (36-pin, 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

Data interface cable, 36-pin for “AMP-CHAMP”
complete connection X33

16

Id. Nr. 249 154-ZY

Id. Nr. 202 420-xx
Cable length up to 10 m (32.8 ft)

PP

Power switch

Data interface

Ground
connection

Input X1 for one
HEIDENHAIN

encoder

11 µA

PP

D-sub
connection

Mounting

You can fasten the ND 282 B from below by using M4 screws
(see illustration at right).

ND 282 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

15°

140 ± 0.2

5.51 ± .008"

Mounting

Alternatives of stacking the display units

17

Power Connection

ND 282 B

The rear panel of the ND 282 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%)

Power Connection

Power supply: 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

18

2

2

)

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

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, 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.

Operating Parameters

19

Code number for changing protected operating
parameters

If you wish to change protected operating parameters, you
must first enter the code number 9 51 48:

ä

Select the user parameter P00 CODE.

ä

Enter the code number 9 51 48.

ä

Confirm entry with ENT.

Parameter P30 appears on the display. By paging through the
list of operating parameters you can display—and, if
necessary, change—each protected operating parameter and,

Operating Parameters

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

20

List of Operating Parameters

Parameter Settings / Function

P00 CODE Enter a code number:

9 51 48: To change the protected

operating parameters
24 65 84: To lock the keyboard
66 55 44: To show the software version
24 65 82: Distance-to-go display

P01 Units of measurement

Display in millimeters MM

Display in inches INCH

P17 CLASS. Sorting and tolerance checking

Sorting and tol. checking ON CLASS. ON

Sorting and tol. checking OFF CLASS. OFF

P18 L.CLASS. Lower limit for sorting

P19 U.CLASS. Upper limit for sorting

P21 M.SERIE Display for series of measurements

OFF DIFF MAX ACTL MIN

P23 DISPL. Display stop for measured value output

Display equal to actual valueDISPL. ACTL.

Display equal to output DISPL. BCD

Parameter Settings / Function

P30 DIR Counting direction

Positive counting direction with
positive direction of traverse DIRECT. POS

Negative counting direction with
positive direction of traverse DIRECT. NEG

P32 SUBD. Encoder signal subdivisions

200 / 100 / 50 / 40 / 20 / 10 / 8 / 5 / 4 / 2 /
1 / 0.8 / 0.5 / 0.4 / 0.2 / 0.1

P33 COUNT Counting mode

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 DEC. Decimal places

1 / 2 / 3 / 4 / 5 / 6
(up to 7 for inch display)

P43 REF Reference marks

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

List of Operating Parameters

21

Parameter Settings / Function

P44 REF Reference mark evaluation

Evaluate the reference mark REF. ON

Do not evaluate the reference
mark REF. OFF

P45 ALARM Encoder monitoring

No monitoring ALARM OFF

Monitor the frequency FREQUENCY

Monitor contamination CONTAMINAT.

Contamination + frequency FRQ. + CONT.

P53 BCD Data output speed

List of Operating Parameters

P54 BCD Latch rate

P55 BCD Data output during value display

P56 BCD Algebraic sign level

Fast BCD FAST

Slow BCD SLOW

LATCH 0.2 / 0.4 / 0.8 / 1.6 /

3.2 / 6.4 / 12.8 / 25.6 [µs]

Concurrent BCD ACTL.

Frozen / hold BCD HOLD

Frozen / concurrent BCD STOP

Low = Minus MINUS LOW

High = Minus MINUS HIGH

Parameter Settings / Function

P57 BCD Behavior without latch signal

Data output always active TRIST. ON

High-impedance output (3-state) TRIST. OFF

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

P84 BCD Display errors

Error display on ERROR ON

Error display off ERROR OFF

22

Parameter Settings / Function

P85 EXT.REF External REF

REF over D-sub port EXT EXT.REF ON

No REF over D-sub port EXT EXT.REF OFF

P86 MOD First indicator after pressing MOD

START PRINT
MIN ACTL MAX DIFF

P87 S-SET Quickly repeat external

zero resetting / setting

Fast external zero resetting / setting
(P53 setting: Fast)
REF mode, datum 2 and series
measurement not usable FAST.SET ON

No fast setting FAST.SET OFF

Parameter Settings / Function

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

23

Linear Encoders

The ND 282 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

Linear Encoders

following operating parameters:

• Subdivision (P32)

• Counting mode (P33)

• Decimal places (P38)

Example

Linear encoder with a signal period of 10 µm

Desired display step ................. 0.000 5 mm

Subdivision (P32) ...................... 20

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

24

Recommended parameter settings for HEIDENHAIN linear encoders with 11 µAPPsignals

Model

Signal period

in µm

P 32 P 43

CT
MT xx01
LIP 401A/401R

LF 103/103C
LF 401/401C
LIF 101/101C
LIP 501/501C

LIP 101
MT xx 10 20

LS 303/303C
LS 603/603C

24

10
20
40

100
200

44

8
20
40

200

50
100

20 2

4

Reference
marks

Subdivision

Single 0,0005

Single

Single / 5000 0,001

Single 0,00002 2 5 0,000001 1 6
Single 0,0005

Single / 1000 0,01

Millimeters Inches

Display
step
in mm

Count

mode

P 33 P 38

5
0,0002
0,0001
0,00005

Recommd. only for LIP 401

0,00002
0,00001

0,0005
0,0002
0,0001

Recommd. only for LIP 101

0,0002
0,0001

0,005

2

1

5

2

1

1

5

2

1

5

2

1

1

5

4
4
4
5

5
5

3
4
4
4

4
4
4

2
3

Decimal

places

Display
step
in inches

0,00002
0,00001
0,000005
0,000002

0,000001
0,000000515

0,00005
0,00002
0,00001
0,000005

0,00002
0,00001
0,000005

0,0005
0,0002

Count

mode

Decimal

P 33 P 38

2
1
5
2

5
2
1
5

2
1
5

5
2

5
5
6
6

6
7

5
5
5
6

5
5
6

4
4

places

Linear Encoders

25

Recommd. parameter settings for HEIDENHAIN linear encoders with 11 µAPPsignals (conti­nued)

Model

Linear Encoders

LS 106/106C
LS 406/406C
LS 706/706C
ST 1201

LB 302/302C
LIDA 10x/10xC

LB 301/301C 100 20

Signal period

in µm

P 32 P 43

20 20

40

40 8

20
40

200

50
100

Reference
marks

Subdivision

Single / 1000

­Single / 2000

Single / 1000 0,005

Millimeters Inches

Display
step
in mm

Count

mode

P 33 P 38

0,001
0,0005

0,005
0,002
0,001

Recommd. only for LB 302

0,0002 2 4 0,000001 1 5

0,002
0,001

1
5

5
2
1

5
2
1

3
4

3
3
3

3
3
3

Decimal

places

Display
step
in inches

0,00005
0,00002

0,0002
0,0001
0,00005

0,0002
0,0001
0,00005

Count

mode

P 33 P 38

5
2

2
1
5

2
1
5

5
5

4
4
5

4
4
5

Decimal

places

26

BCD Data Interface (X33)

There are several ways to start measured value output:

ä

Press MOD repeatedly until the PRINT indicator blinks
(only for“slow” data output), then start data output with
ENT;

or

ä

Let the measured values periodically be sent to the data
output;

or

ä

nput a latch command at the D-sub connection EXT;

or

ä

nput a latch command at the BCD connection.

Interface Operating Mode (see Operating Parameter P53)

slow– Display value
fast – Display value referenced to datum 1

(MIN/MAX/DIFF display values are not shown)

You can order a connecting cable (to a PC, for example) from
HEIDENHAIN (Id. Nr. 206 420-..); maximum cable length 10 m.

“AMP-Champ“ Connector (36-pin, female)

0

2

1234Decade 1
5678Decade 2

9 10 11 12 Decade 3
13 14 15 16 Decade 4
17 18 19 20 Decade 5
21 22 23 24 Decade 6
25 26 27 28 Decade 7
29 30 31 32 Decade 8

Pins Assignment

33 Algebraic sign
34 Ready message
35 Display value
36 0V

Pins Assignment

1

2

2

2

3

2

BCD Data Interface (X33)

Operating parameters for display output: P23, P53 to P57,

P84.

Output Level Low: U£0,4 V at I£6 mA

High: U³3,8 V at I£2,6 mA

The output signals are TTL
compatible.

Latch level Low: U£0,9 V at I

High: U³3,9 V; or

TTL level (internald pull-up
resistor 10 kW).

max

£

6 mA

27

Signal run times

The times in the following table are guide lines.
If you are working with slow data output and are using display
functions at the same time (e.g. measurement series or inch display),
the actual signal run times can be twice as long as given here.

EXT(X41)

Pin 23

Pin 1(0V)

Concurrent Data Output (P55 ACTL)
Operating
mode P53 Latch rate Data output after

fast FAST P54 Value from P54 / 2
slow SLOW t£ 30 ms t £ 8 ms

BCD Data Interface (X33)

Data output after external latching
(P55 STOP or HOLD)
Operating P53 Minimum Measured value
mode impulse length latched after

fast FAST 3 µs 7 ms 0.3 µs 1.1 µs 4.8 ms
slow SLOW t³ 8 ms t ³ 13 ms 0.3 µs 1.1 µs 4.8 ms

fast FAST

slow SLOW

28

Pulse/ Contact BCD Pulse Contact
BCD

Data output Relatch after

Pulse/ Contact
BCD

£

0.3 µs after internal 3 µs 7 ms

latching

£

7.5 ms after internal 3 µs 7 ms

latching

EXT(X41)

Pin 22

Pin 1(0V)

Triggering the “Contact” and “Pulse” inputs at D-sub
connection EXT (X41)

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 ³ trigger limit A1 (P62)

16 Measured value ³ trigger limit A2 (P63)

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

6 Externally select display value for series of

measurements

7 Display MIN value of series of measurements

8 Display MAX value of series of measurements

9 Display difference MAX – MIN

22 Pulse: Output measured value

23 Contact: Output measured value

24 Deactivate BCD data output

25 Enable or disable REF mode

(current REF status is changed)

12, 13 Do not assign

11, 20, 21 Vacant

Special case: Display current measured value ACTL

If you wish to display the current measured value ACTL of a
series of measurements, note for inputs 7, 8 and 9:
Either none or more than one of these inputs must be active.

Switching Inputs and Outputs EXT (X41)

29

Inputs

Outputs

Input signals

Internal pull-up resistor 1 kW, active with low level

Trigger by making contact against 0 V or
by low level signal over TTL logic device

Minimum pulse duration: t ³ 30 ms,
with fast set/zero reset: t ³ 30 µs

Minimum pulse duration: t ³ 30 ms, with set/zero reset:
t³ 1.5 ms, with fast set/zero reset: t ³ 30 ms

Delay for set/zero reset: fast data output t
slow data output td£

2ms

d

Signal level of inputs

Status Level

High + 3.9 V £ U £ + 15 V

Low – 0.5 V £ U £ + 0.9 V; I £ 6 mA

Switching Inputs and Outputs EXT (X41)

E

0V

E

0V

t

30

£

25 µs;

t

min

min

³ÿ

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: t0³

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

180 ms

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) is active, the display will ignore all
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.

Externally selecting MIN/MAX
Starting a series of measurements
Switching the display between MIN/MAX/DIFF/ACTL

You can activate the operating mode for finding minimum and
maximum values from a series of measurements with an
external signal (pin 6, low-level signal must continuously be
present). The setting selected with MOD or operating
parameter P21 is disabled. You can switch to MIN/MAX/DIFF/
ACTL display (pins 7, 8, 9, low-level signal must be present
continuously) and START (pin 5, Pulse) a new series of
measurements only by external signal over the switching
inputs.

Switching Inputs EXT (X41)

31

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

Switching Inputs EXT (X41)

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.

32

Measured value > Upper
sorting limit

Lower limit Upper limit

Path

Weg

Path

5

Pin 15

(A1)

t

d

t

v

t

t

d

v

Time curve of signal at pin 15 for trigger limit (A1) = 5 mm , td£

t

t

30 ms

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.

ERROR xx

Error

Switching Outputs EXT (X41)

33

Distance-to-Go Display Mode

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 24 65 82.

Distance-to-Go Mode

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

ä

Select datum point 2.

ä

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.

Path

t

d1

Time curve of a signal for switching limit (A1) = 10 mm,
t

£

30 ms, td2£

d1

180 ms

t

d2

34

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

35

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.

Locking the Keypad

➤ With the “•” or “–” key, select KEYS ON or

KEYS OFF.

➤ Confirm your selection with ENT.

If the keypad is locked, you can only select the datum or
select P00 CODE over the MOD key.

36

Specifications

Housing ND 282 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)

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 Class B according to EN 55022
compatibility

Noise immunity As per VDE 0843 Parts 2 and 4,

severity 4

Protection IP40 according to IEC 529

Encoder inputs For linear encoders with sinusoidal

output signals (11 µA
Reference mark evaluation for distance­coded and single reference marks

Input frequency Max. 50 kHz for 30 m cable length

Display step Adjustable (see “Linear Encoders”)

Datum points Two

Functions • Series of measurements

• Sorting and tolerance checking

• Switching and sorting signals

• Set display and reset display to
zero with external signal

• Measured value output

BCD Interface Output measured values

PP

);

Specifications

37

ND 282 B: Dimensions in mm/inches

1

REF

SET START PRINT2 inch

< = >

MIN ACTL

MAX DIFF

Specifications

X

35

1.43"

38

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"

DR. JOHANNES HEIDENHAIN GmbH

Dr.-Johannes-Heidenhain-Straße 5

83301 Traunreut, Germany

{ +49/8669/31-0

| +49/86 69/5061

e-mail: [e-mail]

{ Service
{ TNC-Service
|+49/8669/98

e-mail: [e-mail]

http://www.heidenhain.de

HEIDENHAIN (G.B.) Limited

200 London Road, Burgess Hill
West Sussex RH15 9RD, Great Britain

{ (01444) 24 77 11
| (01444) 87 00 24

+49/8669/
+49/8669/

99

31-12 72
31-14 46

354 520-21 · SW354 394-01 · 5 · 4/2001 · E · Printed in Germany · Subject to change without notice

39