8 use of an ssi encoder at x8, Use of an ssi encoder at x8, 7encoder evaluation – Lenze E94AxPExxxx User Manual
Page 295
Lenze · 9400 Servo PLC· Reference manual · DMS 4.0 EN · 11/2013 · TD05/06
295
7
Encoder evaluation
7.3
Parameter setting
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
7.3.8
Use of an SSI encoder at X8
All encoders at X8 using the Stegmann SSI protocol are supported.
• Supported bit rates for the SSI communication: 150 ... 1000 kbits
• Supported data word widths: 1 ... 31 bits (effective)
• Supported output code of the SSI encoder: Gray or binary
• The SSI encoder can be used as position encoder or master encoder with a minimum cycle time
of 1 ms.
• The SSI encoder can be supplied via X8 up to a maximum voltage of 12 V and a maximum
current of 0.25 A.
• The SSI data words received are provided to the application via the
system
block for further processing within the function block editor.
How to parameterise the SSI encoder at X8:
1. Set the supply voltage of the SSI encoder used in
.
2. Set the selection "4: SSI encoder" as encoder type in
.
3. Set the bit rate for SSI communication in
.
• For SSI protocols, the permissible baud rate is reduced if the cable length is increased. A
safe bit rate must be set, depending on the length of the used encoder cable and the
electromagnetic interference level.
• Lenze setting: 400 kbits (for encoder cables with a length of up to ≈ 50 meters)
4. Set the data word width in
, i. e. the number of data bits that is used for the
transmission of a complete SSI data packet.
• Lenze setting: 25 bits (Stegmann multiturn SSI encoder)
5. Optionally: Split the SSI data word received into partwords and connect a data conversion
from Gray into binary code, which may be required (see the following subchapters).
Note!
The
SB is only provided within controllers with a MM3xx or MM4xx
memory module.