HEIDENHAIN ND 221 User manual

Working with the measured ND 221
value display unit
HEIDENHAIN
REF 2 1SET
in.
789
456
123
0.–
CL
MOD
Actual value and input display
(7-segment LED,
9 decades and sign)
•Select datum
• Page backward in
parameter list Numeric keypad
•Confirm entry value
• Set display to value from
P79 (P80!)
• Go to parameter list after switch-on
• Page forward in parameter list
•Algebraic sign
• Decrease pa-
rameter value
•Clear entry
• Reset to zero (P80!)
• CL plus MOD:
parameter list
• CL plus 2-digit number:
select parameter
• Clear parameter entry
and show parameter
number
Indicator Meaning
REF If decimal points are blinking:
Display is waiting for the reference mark to be crossed over.
If decimal points are not blinking:
Reference mark was crossed over — datum points are now
stored in nonvolatile memory.
Blinking: Waiting for operator to press ENT or CL.
in. Position values displayed in inches.
1 / 2 Datum 1 / Datum 2 currently active.
SET Blinking: Waiting for operator to confirm entry values.
•Decimal point
• Increase pa-
rameter value
Status display
HEIDENHAIN

The ND 221 is designed primarily for use with HEIDENHAIN MT Length Gauges.
MT gauges feature one reference mark. When the reference mark is crossed over,
it generates a signal identifying that position as a reference point.
After switch-on, simply crossing over the reference mark re-establishes the relation-
ship between axis positions and display values as it was last defined by datum
setting.
It is also possible to use other photoelectric linear encoders (see “Parameter Settings
for HEIDENHAIN Linear Encoders”). These encoders have one or more reference
marks, which may also be
distance-coded . With distance-coded reference marks, a
maximum traverse of only 20 mm after switch-on suffices to re-establish the datum.
Switch-On
You can switch from one datum to the other at any time.
Use datum 2 when you want to display incremental dimensions.
Select datum 1 or 2.
4 0
Confirm entered value.
Enter a value, such as 40.
Switch on reference mark evaluation
•The display shows the value last assigned to the
reference mark position.
•REF indicator glows.
•Decimal point blinks.
Cross over reference mark
Move the axis until the display becomes active and the
decimal point no longer blinks.
5 , 6 9 7
Turn on the power (switch located on rear panel)
•Display shows .
•REF blinks.
Ent...CL
0 ➤1
If you do not wish reference mark evaluation, press CL instead of ENT.
Setting the Datum
The datum setting procedure assigns a display value to a specific axis position.
The ND 221 allows you to set two separate datum points.
⇔

Operating Parameters
The parameters are divided into “user parameters“and “protected operating param-
eters," which can only be accessed by entering a code number.
User parameters
User parameters are operating parameters that you can change without entering the
code number: They are designated P00 to P30, P50, P51, P79, P86
Calling user parameters
To call user parameters immediately after switch-on:
➤➤
➤➤
➤Press the MOD key as long as is visible in the display.
To call user parameters during operation:
➤➤
➤➤
➤Press and hold the CL key, then press MOD.
To go directly to a specific user parameter:
➤➤
➤➤
➤Press and hold the CL key, then press the first digit of the parameter number.
➤➤
➤➤
➤Release both keys and press the second digit.
Protected operating parameters
Before you can change protected operating parameters you must enter the code
number 95 148 through : They remain accessible until you switch off
the position display.
To page through the parameter list
➤➤
➤➤
➤Forward paging: Press the MOD key.
➤➤
➤➤
➤Backward paging: Press the 1 / 2 key.
By paging on, you automatically enter any change you've made in a parameter.
To change operating parameters
➤➤
➤➤
➤Increase the parameter value with the decimal point key, or
➤➤
➤➤
➤Decrease the parameter value with the minus key, or
➤➤
➤➤
➤Enter the numerical value for the operating parameter, e.g. for P41 ( SET blinks).
To correct your entries and show the parameter designation
➤➤
➤➤
➤Press the CL key.
To exit the operating parameters
➤➤
➤➤
➤Press ENT. All changes made become effective.
Operating Parameter List
Parameter Meaning Function / Effect Setting
Enter code number 95 148 to change a protected operating
parameter.
Unit of measure Display in millimeters
Display in inches
Counting Normal ( Positive )
Direction direction Inverse ( Negative )
Subdivision of encoder signal period 400, 320, 256, 200, 160,
Subdivision 128, 100, 80, 50, 40, 20, 10, 8, 5, 4, 2, 1, 0.8, 0.5, 0.4, 0.2, 0.1

Operating Parameter List — continued
Parameter Meaning Function / Effect Setting
Counting 0-1-2-3-4-5-6-7-8-9-0
mode 0-2-4-6-8-0
0-5-0
Decimal places 1 / 2 / 3 / 4 / 5 / 6 (up to 8 with inch display)
Decimal point
Linear error compensation1)
Compensation
–99 999,9 < P41 < + 99 999,9 [µm/m]
Reference One reference mark
marks Distance-coded with 500 •SP
(SP = signal period)
Distance-coded with 1000 •SP
(e.g. for LS 303 C / LS 603 C)
Distance-coded with 2000 •SP
Distance-coded with 5000 •SP
Reference mark Evaluation
evaluation No evaluation
Encoder No monitoring ( Alarm Off )
Encoder monitoring Contamination
Frequency
Contamination and frequency
Baud rate 110, 150, 300, 600, 1200, 2400, 4800, 9600
Additional line feeds 0 to 99 ( Linefeed )
Value for Enter numerical value for datum setting with
Preset datum the ENT key
Reset/Preset No zero reset/preset with CL/ENT
Zero reset with CL ( Set Zero ),
no preset with ENT
Zero reset with CL and
preset with ENT to value in P79
Display after message displayed
Message switch-on message not displayed
Inhibit PRINT PRINT inhibited
Mode function PRINT not inhibited
1) Determine entry value for P41
Example: Displayed measuring length La= 620.000 mm
Actual length (determined with, for example, the VM 101
comparator system from HEIDENHAIN) Lt= 619.876 mm
Length difference ∆L = Lt– La= –124 µm
Compensation factor k:
k = ∆L / La= –124 µm / 0.62 m = –200 [µm/m]

Parameter Settings for HEIDENHAIN Linear Encoders
Example: Set parameters for any encoder
Linear encoder with signal period s = 10 µm
Desired display step a = 0.000 1 mm
Subdivision P32 = 0.001 • s / a ==
==
= 100
Counting mode P33 = 1 (display counts 1, 2, 3 ...)
Decimal places of a: P38 = 4
Display step
(unit: P01) The following settings apply for mm:
Model
Signal period [µm] Reference mar s
P 43
mm inches Subdi-
vision
P32
Count.
mode
P33
Decimal
places
P38
CT
MT xx01 one single
none -
0,0005
0,0002
0,0001
0,00005
0,00002
0,00001
0,000005
0,000002
4
10
20
40
5
2
1
5
4
4
4
5
Recommen e only for LIP 401
LIP 401
2
one single
0,00002
0,00001
0,000005
0,000001
0,0000005
0,0000002
100
200
400
2
1
5
5
5
6
one singleLF 103
LF 401
LIF 101
LIP 501
ist.c. 5000
0,001
0,0005
0,0002
0,0001
0,00005
0,00005
0,00002
0,00001
0,000005
0,000002
4
8
20
40
80
1
5
2
1
5
3
4
4
4
5
Recommen e only for LIP 101
LIP 101
4
one single
0,00002
0,00001
0,000001
0,0000005
200
400
2
1
5
5
MT xx 10 one single 0,0005
0,0002
0,0001
0,00002
0,00001
0,000005
20
50
100
5
2
1
4
4
4
one singleLS 303
LS 603
20
ist.c. 1000
0,01
0,005
0,0005
0,0002
2
4
1
5
2
3
one singleLS 106
LS 406
LS 706 ist.c. 1000
ST 1201
20
none -
0,001
0,0005
0,00005
0,00002
20
40
1
5
3
4
one single 0,005
0,002
0,001
0,0005
0,0002
0,0001
0,00005
0,00002
8
20
40
80
5
2
1
5
3
3
3
4
Recommen e only for LB 302
LB 302
LIDA 10x 40
ist.c. 2000
0,0002
0,0001 0,00001 0,000005 200 400 2 14 4
one singleLB 301 100
ist.c. 1000
0,005
0,002
0,001
0,0002
0,0001
0,00005
20
50
100
5
2
1
3
3
3
LIM 102 12800 one single 0,1
0,05 0,005 0,002 128 256 1 51 2

Data Output
There are two ways to output data:
➤PRINT function: Press MOD (this method can be inhibited with
operating parameter P86); or
➤Enter the command STX (CTRL B) over the RXD input.
A connecting cable (to a PC, for example) is available from HEIDENHAIN
(Id.-Nr. 274 545 ..); cable length up to 20 m (66 ft).
Operating parameters for data output: P50, P51
Wiring, pin layout
Connecting cable is either completely wired (left) or only partially wired (right).
1GND
2
3
4
5
6
20
7
TXD
RXD
RTS
CTS
DSR
GNDSIGNAL
DTR
CHASSIS 1 GND
2
3
4
5
6
20
7
TXD
RXD
RTS
CTS
DSR
GNDSIGNAL
DTR
CHASSIS
ND
11GND
2
3
4
5
6
20
7
TXD
RXD
RTS
CTS
DSR
GND
SIGNAL
DTR
CHASSIS
2
3
4
5
6
20
7
ND
GND
TXD
RXD
RTS
CTS
DSR
GND
SIGNAL
DTR
CHASSIS
CHASSIS GND: Chassis Ground; TXD: Transmitted Data; RXD: Received Data;
RTS: Request To Send; CTS: Clear To Send; DSR: Data Set Ready; SIGNAL GND:
Signal Ground; DTR: Data Terminal Ready
Signals Signal level "active" Signal level "not active"
TXD, RXD –3 V to –15 V +3 V to +15 V
RTS, CTS, DSR, DTR +3 V to +15 V –3 V to –15 V
Data transfer format and transmission control characters
Format ASCII code
Data word 1 start bit, 7 data bits, parity bit (even parity), 2 stop bits
Control characters Call measured value: STX (CTRL B), interrupt DC3 (CTRL S),
resume DC1 (CTRL Q)
Enquire error message: ENQ (CTRL E)
Sequence •Sign •Numerical value with decimal point •Blank space
•Unit (blank space = mm, " = inches, ? = error)
•2 blank spaces •Carriage return •Line feed
Storage and transfer times
The duration of data transfer depends on the selected baud rate and on the number
of additional line feeds.
Latch signal Storage time Data transfer time
STX (CTRL) B ≤1 ms ≤23 ms
PRINT ≤22 ms ≤44 ms

Error Messages
To clear error message :
When you have removed the cause of the error,
➤press CL.
Message Cause and effect
Last measured value not yet latched
External device not ready for data transfer
( only appears once)
Data interface:
Parity error or wrong data transfer format
Incorrect input value
Encoder signal too weak (encoder may be contaminated)
Input frequency too high for encoder input (will occur for example
when the scale is moved too quickly)
Internal counter overflow
Error while crossing over reference marks
To clear the error message: Switch off the display unit.
Should any of these error codes recur, contact your
HEIDENHAIN service agency.
Offset compensation values for encoder signals have been
erased: contact your HEIDENHAIN service agency.
Erase the operating parameters.
If all decimal points light up, the measured value is too large or too small.
In this case, set a new datum or retract.
Distance-To-Go Mode
The standard setting for the display unit is to show the encoder position value.
Particularly on machine tools and for tasks in automation, however, it can be very
helpful for the display to instead show the distance remaining to a manually entered
nominal position. You can then position the tool by simply moving the axis to the
display value zero. Code number 246 582 provides access to distance-to-go mode.
Display Meaning
No distance-to-go display
Distance-to-go display
“Traverse to zero” with distance-to-go display
➤➤
➤➤
➤Select datum 2.
➤➤
➤➤
➤Enter the nominal position.
➤Move the axis to zero.

Rear Panel
Input for HEIDENHAIN linear encoder with
sinusoidal output signals (7µAPP to 16 µAPP),
connecting cable max. 30 m (98.5 ft), maxi-
mum permissible input frequency 100 kHz
Ground terminal
Power switch
Power Supply and Connection
Installation
You can fix the display unit to a mounting surface with
M4 bolts.
The units can also be stacked. Adhesive inserts (included
in delivery) prevent them from sliding.
172 ±0.2
6.77 ±.008"
140 ±0.2
5.51 ±.008"
RS-232-C/V.24
data interface
Interface X1 complies with the recommendations in EN 50 178 for separation
from line power.
Danger of electrical shock!
Unplug the power cord before opening the housing.
Connect a protective ground. This connection must never be interrupted.
Danger to internal components!
Do not engage or disengage any connections while the unit is under power.
Use only original replacement fuses.
Primary-clocked power supply.
Voltage range 100 V to 240 V (–15% to +10 %) Frequency 48 Hz to 62 Hz
Power consumption typ. 8 W Line fuse F 1 A (in unit)
Minimum cross-section of power line: 0.75 mm
2
X1
X31 (V.24/RS-232-C)
100 ... 240 V
50 ... 60 Hz
Ambient Conditions
To increase the noise immunity, connect the ground terminal on the rear panel
to the central ground point of the machine. (Minimum cross-section 6 mm2)
Temperature range Operation: 0°C to + 45°C (32°F to 113°F)
Storage: –30°C to + 70°C (–22°F to 158°F)
Rel. humidity Annual average: < 75%; maximum: < 90%
Weight 1.5 kg
284 249-25 ·SW 246 181 01 ·3 ·3/2000 ·H ·Printed in Germany ·Subject to change without notice
DR. JOHANNES HEIDENHAIN GmbH
Dr.-Johannes-Heidenhain-Straße 5
D-83301Traunreut, Deutschland
(0 86 69) 31-0 .56 832
(0 86 69) 50 61
FAX
FAX
Service (0 86 69) 31-12 72
TNC-Service (0
86 69) 31-14 46
(0
86 69) 98 99
Tx
http://www.heidenhain.de