HEIDENHAIN ND 221B User manual

English (en)
12/2001
Measured Value Displays
User’s Manual
ND 221 B
SALES & SERVICE:
A Tech Authority, Inc.
13745 Stockton Ave.
Chino CA 91710
909-614-4522
[email protected]

2
Numeric keypad
with decimal point
Status display with indicators
Display of actual value and input
(9 decades with algebraic sign)
HEIDENHAIN
789
456
123
0.CL
MOD
REF SET START PRINT inch
MIN ACTL MAX DIFF
= <>
21

3
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
MOD
Key Function
• Set datum
• Transfer input value
• Set display to value from P79 (P80!)
• Leave parameter list
• Select datum
• Page backwards in parameter list
• 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
< / = / > Without function
MIN
/ MAX /
DIFF / ACTL /
START

4
This manual is for the ND 221 B measured value
display with the following software number or
higher:
349 797-04
The software number is indicated on a label on
the rear panel.
Items supplied
Items supplied with ND 221 B
Measured value display unit,
ND 221 B benchtop model
Encoder input 11 µAPP Id. Nr. 344 992-xx
Power cord 3 m (9.9 ft)
User's Manual ND 221 B
Adhesive plug-in feet For stacking ND 221B units

5
Installation and Specifications
Rear Panel, Accessories 11
Mounting 12
Power Connection 13
Operating Parameters 14
List of Operating Parameters 16
Linear Encoders 19
NonlinearAxis 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 Parameter and 32
CompensationValue Lists
Output Format of the Parameter List 34
Output Format of the CompensationValueTable 37
Remote Operation over the RS-232-C/V.24 40
Data Interface
Specifications 43
Dimensions 44
Contents
Contents
Working with the ND Display Units
Position Encoders and Reference Marks 6
Switch-On, Traversing Reference Marks 7
Datum Setting 8
MeasuredValue Output 9
Error Messages 10

6
Scale in Distance-coded
linear encoder reference marks
Position Encoders and Reference Marks
The ND 221 B display unit is designed for use with
photoelectrical linear encoders with 11 µApp sinusoidal
signals: primarily for HEIDENHAIN MT length gauges with
11 µApp.
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
distance-coded
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
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).
Reference mark
Reference marks on linear encoders
Position Encoders and Reference Marks

7
Switch-On, Traversing the Reference Marks REF Mode
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.
Turn on the power.
(Switch located on rear panel.)
• ND 221 B appears for two seconds.
•ENT...CL 1) appears.
• 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.
Û
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.
5,697
ENT...CL
0
ä
1
For automation purposes, crossing over the reference marks
and the display ENT ... CL can be disabled with parameter
P82.
Switch-On, Traversing the Reference Marks

8
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
(see P79, P80).
Select datum 1 or 2.
After datum setting: assignment of measured values to positions
Without datum setting: unknown assignment of measured values
to positions
Z
?
?
?
?
?
Enter numerical value (here, 5).
5
Datum Setting
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.

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:
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).
HEIDENHAIN
REF 2 1 SET START PRINT in.
MIN ACTL MAX DIFF
= <>
789
456
123
0.–CL
MOD
PC
Measured Value Output
The RS-232-C/V.24 interface (X31) enables you to connect a printer
or a PC to your display unit

10
Other error displays
If “OVERFLOW” appears, the measured value is too large or
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.
Error Messages
Error Messages
Display Effect/Cause
RS232 FAST Command for measured value
output followed too quickly by
another. 1)
SIGNAL Encoder signal is too weak.
The scale may be contaminated. 1)
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
match. 1)
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 com-
pensation 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