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Nd 287 functions, Switching i/o – HEIDENHAIN ND 287 Quick Start User Manual

Page 8

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4

Axis Coupling

Input X2 is available for an additional
input assembly (option). Possible options:

Encoder module for connecting a

second encoder
Analog module for connecting an

analog sensor with ± 10 V

Descriptions are included with the
modules.

X1 and X2 can be displayed separately
or they can be coupled through
mathematical functions. You can switch
the display by soft key or through a
switching input at any time.

The following axis displays are possible:

Input X1

Input X2

Sum of X1 and X2

Difference between X1 and X2

Any function for coupling X1 and X2

Special features of coupled

positions

If PRESET is used, X1 is set to the

value entered, and X2 is set to zero.
If RESET is used, a value other than

zero may be displayed depending on
the programmed formula (e.g.: 5 if
"X1 + X2 + 5").
The values of the currently active axis

display are used for SPC.
If two axes are coupled, the fi ner of

the two display resolutions will be
used.
If axis values are used as divisors,

division by zero or display overfl ow
may cause a temporary error
message.
If an analog sensor is connected to

input X2 and the ENCODER TYPE
fi eld under Encoder Setup, Input X2 is
set to COMPENSATION, the ND 287
behaves in the same way as a
single-axis display unit.
If COMPENSATION is selected, the

formula for axis-error compensation is
determined automatically. You only
enter the coeffi cient of expansion and
the reference temperature.

Pin Layout

PIN

Version 1

Version 2

1

0 V

2 I

Reset, clear error message

3 I

Set the datum

4 I

Ignore reference mark signals (input X1)

5 I

Start measurement series

f(X1,X2) display

6 I

Select display value for meas. series externally

X1 display

7 I

Display the minimum value (MIN) of the meas. series

X2 display

8 I

Display the maximum value (MAX) of the meas. series

X1+X2 display

9 I

Display the difference MAX-MIN of the meas. series

X1-X2 display

10

0 V

11

Free

12

Do not assign

13

Do not assign

14

O

Display value is zero

15

O

Measured value is greater than or equal to trigger limit A1

16

O

Measured value is greater than or equal to trigger limit A2

17

O

Measured value is less than the lower sorting limit

18

O

Measured value is greater than the upper sorting limit

19

O

Error

20

Free

21

Free

22

I

Measured value output (pulse)

23

I

Measured value output (contact)

24

I

Ignore reference mark signals (input X2, optional)

25

I

Activate or deactivate REF mode

I: Switching input; O: Switching output
Version 1 or 2 can be selected in Function External Inputs in the Job Setup menu.

Switching Inputs

The switching input E is active
when a Low signal U

L

is applied

(contact or pulse to 0 V).

Signal level
– 0.5 V † U

L

† 0.9 V at I

L

† 6 mA

3.9

V

† U

H

† 15.0 V

t

min

‡ 30 ms

Switching Outputs

The ND 287 features open-collector
outputs that switch to 0 V (= active Low).

Delay of signal output:
t

D

† 20 ms

Signal level
U

L

† 0.4 V at I

L

† 100 mA

U

H

† 32 V at I

H

† 10 µA

Danger to internal components!

The power supply of external circuits must comply with EN 50

178 requirements for

low voltage electrical separation.
Connect inductive loads only with a

quenching diode parallel to the inductance.

Use only shielded cables.

Connect the shield to the connector housing.

In the Distance-To-Go operating mode, the switching outputs A1 (pin 15) and A2

(pin 16) are based on switching ranges.

ND 287
Functions

For detailed description, see
www.heidenhain.de

Switching I/O

Contact

Pulse