HEIDENHAIN EnDat 2.2, Technical Information, Page: 12 / 20

12
Parameters of the encoder manufacturer for EnDat 2.2
Unit for
Requir
ed
Depends on application Inf
or
mativ
e
Word Contents Linear
encoder Rotary/
angle
encoder Remark
0 Status of additional data 1 – – – All – Can be safety related.
Cross checking of “what is required” and
“what does the encoder support”
1 Status of additional data 2 – – – All –
2 Status of additional functions – – – All –
3 Acceleration m/s
2
1/s
2
– All – Consider the scaling factor
4 Temperature K K – All – Consider the scaling factor
5 Diagnostic status – – – – All –
6 Support of error message 2 – – All – – For defi nition of an “error mask” (safety related)
7 Dynamic sampling status – – – All – Safety technology
8
9 Measuring step or measuring steps
per revolution for position value 2 nm – –
All
– Safety technology
10
11 Accuracy of position value 2 depending
on linear velocity or shaft speed, area I LS
1)
LS
1)
– All – Safety technology
12 LS
1)
LS
1)
– All – Safety technology
13 Accuracy of position value 2 depending
on linear velocity or shaft speed, area II LS
1)
LS
1)
– All – Safety technology
14 LS
1)
LS
1)
– All – Safety technology
15 Distinguishable revolutions Position
value 2 (only for multiturn encoders) – – W D – – Required for correct calculation of the position
16 Direction of rotation of position value 2 – – All – – –
17-20 Encoder designation – – – – All –
21 Support of instructions – – – – – Not yet supported.
Not for safety technology
22 Max. permissible encoder temperature
at measuring point K K – W L D
IL i – Not supported by E
23 Max. permissible acceleration m/s
2
1/s
2
– W L D
IL i – Not supported by E
24 Number of blocks for memory area
section 2 – – All – – Depends on encoder; program fl exibly.
25 Maximum clock frequency kHz kHz All – – Depends on connector, cable lengths
26 Number of bits for position comparison – – – All – Safety technology
27 Scaling factor for resolution – – All – – For calculation of the smallest display step (LS).
28 Measuring step, or measuring steps
per revolution or subdivision values of
a grating period – – All – –
29
30 Max. velocity or rotational shaft speed
for constant code value m/min min
–1
– W L D
IL i – Specifi c to application. Applies for encoders
that permit higher mechanical than electrical
speed. (Not supported by the EIB.)
31-33 Offset between position value and
position value 2 – – – All – Safety technology
34 “Number of distinguishable
revolutions” with scaling factor – – W D – – Required for correct calculation of the position
35 Support of operating status error
sources – – – All – Expanded EnDat error message, particularly for
battery-buffered encoders
36-38 Safety-relevant measuring steps – – – All – Safety technology
39-40 Non-safety-relevant subdivision of the
relative position – – – All – Safety technology
41-42 Non-safety-relevant subdivision of the
absolute position – – – All – Safety technology
43 Generation of a warning message
through limit position signals – – – L IL – Presently available only with certain
incremental exposed linear encoders
44 Support of touch probe statuses – – T – – Supported features
45 Timestamp unit of measure – – T – – –
46 Referencing of incremental encoders – – – IL, Ir, E – Is re-referencing supported?
47 Support of I/Os – – – All – Are I/Os supported, and if so, which?
48 Number of OEM blocks for memory
area section 2 – – – All – The memory area section 2 makes larger
OEM memory possible
63 CHECKSUM – – – – – –
1)
The higher-valued byte contains the divisor with respect to the maximum permissible linear velocity or rotational shaft speed up to
which this accuracy is valid.