9-24
Extended Drive Functions
MPH-02, MPB-02, MPD-02
DOK-INDRV*-MP*-02VRS**-FK01-EN-P
Absolute Encoder Emulation
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:
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
G23 G22 G21 G20 G19 G18 G17 G16 G15 G14 G13 G12 G11 G10 G9 G8 G7 G6 G5 G4 G3 G2 G1 G0
25
PFB
0
1
1
1
clock
T
data
1
2
G23 G22
1
T
p
G23
G22
G0
PFB
T
m
t
v
clock break > 20 µs
=
=
=
=
=
=
=
G0
G23
m
T
T
p
t
v
PFB
SV0202F1.FH7
resolution for 4096 revolutions
resolution for 1 revolution
1
2
25
24
data
clock
T
p
least significant bit in gray code
most significant bit in gray code
stored parallel information
clock time
delay time max. 650 ns
power failure bit (not used and always logically LOW)
Fig. 9-12:
Pulse diagram SSI format
Note:
IndraDrive controllers do not support the power failure bit!
Courtesy
of
CMA/Flodyne/Hydradyne
▪
Motion
Control
▪
Hydraulic
▪
Pneumatic
▪
Electrical
▪
Mechanical
▪
(800)
426-5480
▪
www.cmafh.com
