Lenze EPM-T110 - Page 268

Parameterising SSI interface
Parameter data
12
Parameter setting
12.5
12.5.1
l
12.5-2
EDSPM-TXXX-3.0-04/2004
The parameter data are assigned as follows:
Byte Assignment Lenz e setting
0 reserved
1 reserved
2 Baud rate
1)
00
h
= 300 kBaud
00
h
2
B
a
u
d
r
a
t
e
01
h
= 100 kBaud
0
0
h
02
h
= 300 kBaud
03
h
= 600 kBaud
04
h ...
FF
h
= 300 kBaud
3 Coding
2)
Bit 0
0 Binary code
00
h
3
C
o
d
i
n
g
B
i
t
0
1GrayCode
0
0
h
Bit 1 reserved
Hold function
3)
Bit 2
0 Deactivate
H
o
l
d
f
u
n
c
t
i
o
n
B
i
t
2
1Activate
Bits 3 ... 7 reserved
1)
Baud rate: The encoder connected to the SSI interface transmits serial data. Therefore the encoder i s provided
with a clock pulse of the SSI interface. The clock pulse can be determined by you.
2)
Coding: For data transmission you can select the binary code or the Gray code. Transmission errors are easier to
detect with the Gray code since adjacent Gray-code figures differ in exactly one bit.
3)
Hold function: When the hold function is activated, the current encoder value is frozen as soon as +24V are
applied to the i nput E/A.0 +24 V. The encoder value is only updated if the 24 V are not applied a ny more. Please
note, that E/A.0 only operates as an input when the Hold function is ac tivated.


 Note!
The baud rate depends on the cable length and the SSI encoder.
The cables must be twisted and shielded in pairs. The following
data serve as a guideline:
Cable length Baud rate
< 400 m 100 kBaud
< 100 m 300 kBaud
<50m 600 kBaud
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