ND 221 B
User’s Manual
ND 221
Measure d V alue Displays
English (en)
10/2002
B
Display of actual value and input
(9 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
• Select parameter after switch-on
• Page forward in parameter list
• Start measured value output “PRINT”
• Delete entry
• Set display to zero (P80!)
• CL plus MOD: select parameter list
• CL plus number: select parameter
• Delete parameter input and show
parameter number
• Algebraic sign
• Reduce parameter value
• Decimal point
• Increase parameter value
Indicator Meaning
REF If the decimal point is also blinking:
Display is waiting for reference mark
traversing.
If decimal point is 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 Measured value output with MOD key
SET Blinking: Display is waiting for input
values
< / = / > Without function
MIN
/
MAX /
DIFF / ACTL /
START
3
Items supplied with ND 221 B
Measured value display unit,
ND 221B benchtop model
Encoder input 11 µA
Power cord 3 m (9.9 ft)
User's Manual ND 221 B
Items supplied
Adhesive plug-in feet For stacking ND 221B units
This manual is for the ND 221 B measured value
display with the following software number or
higher:
PP
349 797-04
Id. Nr. 344 992-xx
The software number is indicated on a label on
4
the rear panel.
Contents
Working with the ND Display Units
Position Encoders and Reference Marks 6
Switch-On, Trav ersing Reference Marks 7
Datum Setting 8
Measured Value Output 9
Error Messages 10
Installation and Specifications
Rear Panel, Accessories 11
Mounting 12
Power Connection 13
Operating Parameters 14
List of Operating Parameters 16
Linear Encoders 19
Nonlinear Axis Error Compensation 22
Locking the Keypad 26
Displaying the Software Version 27
Distance-to-Go Mode 28
RS-232-C/V.24 Interface (X31) 29
Input and Output of Paramet er and 32
Compensation Value Lists
Output Format of the P ar ameter List 34
Output Format of the Compensation V alue Table 37
Remote Operation ov er the RS-232-C/ V.24 40
Data Interf ace
Specifications 43
Dimensions 44
Contents
5
Position Encoders and Reference Marks
The ND 221 B display unit is designed for use with
photoelectrical linear encoders with 11 µA
signals: primarily for HEIDENHAIN MT length gauges with
11 µA
.
pp
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.
sinusoidal
pp
distance-coded
Scale in Distance-coded
linear encoder reference 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
Position Encoders and Reference Marks
same time, the display unit restores the relationship
between length gauge position and display values which you
last defined by setting the datum.
To restore the datum on scales with distance-coded
reference marks, you only need to traverse a maximum of
20 mm (signal period: 20 µm).
6
Reference mark
Reference marks on linear encoders
Switch-On, Traversing the Reference Marks
REF Mode
ä
0
ENT...CL
5,697
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 221 B appears for two seconds.
• 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 point is blinking.
Cross over the reference mark.
Move the plunger until the display starts
counting and the decimal point stops
⇔
blinking. 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).
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 encoder's actual position.
Z
?
?
?
?
?
Without datum setting: unknown assignment of measured values
to positions
8
After datum setting: assignment of measured values to positions
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:
ä
Press the MOD key (check the parameter settings for P86).
or
ä
Input the command STX (Ctrl B) over the RXD input of the
RS-232-C/V.24 interface (X31).
PC
789
456
START PRINT
MOD
in.
123
0.–CL
REF21 SET
=
<>
MIN ACTL MAX DIFF
HEIDENHAIN
The RS-232-C/V.24 interface (X31) enables you to connect a printer
or a PC to your display unit
Measured Value Output
9
Error Messages
Display Effect/Cause
RS232 FAST Command for measured value
output followed too quickly by
another.
1)
SIGNAL 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. 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.
FREQUENCY Input frequency too high for
encoder input. Traversing speed
may be too fast.
1)
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.
Display Effect/Cause
REC. PARAM. Error during reception of parameter
and compensation value lists
Other error displays
If “OVERFLOW” appears, the measured value is too large or
1)
too small:
ä
Set a new datum.
or
ä
Traverse back.
To clear error messages:
Once you have removed the cause of the error:
ä
Clear the error message with the CL key.
10
Rear Panel
Ports X1 and X31 comply with the
recommendations in EN 50178 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)
Accessories
Connecting elements
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
linear encoder
11 µA
pp
Rear Panel, Accessories
11
Mounting
15°
You can fasten the ND 221 B from below by using M4 screws
(see illustration at right).
Mounting
ND 221 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"
12
Alternatives of stacking the display units
Power Connection
The rear panel of the ND 221 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
13
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, 2).
The display shows the selected user
parameter.
14
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