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9-24
Extended Drive Functions
Absolute Encoder Emulation
resolution for 4096 revolutions
T
clock
1
2
3
4
5
data
1
1
G23 G22 G21 G20 G19 G18 G17 G16 G15 G14 G13 G12 G11 G10 G9 G8 G7 G6 G5 G4 G3 G2 G1 G0
T
clock
1
data
G23
t
v
least significant bit in gray code
G0
=
most significant bit in gray code
G23
=
stored parallel information
m
=
clock time
=
T
T
=
clock break > 20 µs
p
delay time max. 650 ns
t
=
v
PFB
=
power failure bit (not used and always logically LOW)
The absolute encoder emulation provides a digital, coded, absolute
position signal that can be serially read in the position loop clock (Basic:
TA = 500µs, Advanced: TA = 250µs). The resolution of the absolute
position and therefore the travel range that can be displayed in absolute
form are depending on the input in parameter P-0-0903, Encoder
emulation resolution.
Absolute Encoder Emulation in SSI Format
The figure below illustrates the format of the SSI data transmission of the
absolute encoder emulation:
6
7
8
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
m
2
G22
Fig. 9-12:
Pulse diagram SSI format
Note:
IndraDrive controllers do not support the power failure bit!
resolution for 1 revolution
24
25
G0
DOK-INDRV*-MP*-02VRS**-FK01-EN-P
MPH-02, MPB-02, MPD-02
T
p
25
1
PFB
0
1
1
G23 G22
T
p
PFB
SV0202F1.FH7
2
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