Fagor DDS Series Hardware Manual page 293

SERCOS ring connection
The SERCOS IEC 1491 interface is an international standard for digital
communications between CNC's and drives of CNC machines.
The SERCOS communication ring integrates several functions:
 It carries the velocity command from the CNC to the drive in digital
format with greater accuracy and immunity against outside disturbances.
 It carries the feedback signal from the drive to the CNC.
 It communicates the errors and manages the basic control signals of the
drive (enables).
 It allows setting, monitoring and diagnosis of the parameters from the
CNC with simple and standard procedures.
All this drastically reduces the hardware required at the drive, hence, making
it more reliable.
Its open standard structure provides compatibility between CNC's and
drives from different manufacturers on the same machine.
The different drives and the CNC are connected through SERCOS
connector X6 carried by each drive of the FAGOR catalog (see their front
panel) through optic fiber. See chapter 7. CABLES of this manual.
It is a ring connection where the 16-position rotary switch (0-15) of each
drive permits selecting the address of each module integrated in it.
Particular
Differentiate each drive with the 16-position rotary switch " NODE SELECT "
with sequential numbers starting from 1.
NOTE. The module must be reset in order for any change made on the
rotary switch to be effective.
INFORMATION. The DRIBUSID parameters of the CNC must have the same
ID numbers as the ones assigned by means of the Node_Select switch. See
i
figure F. H8/28
.
If the same motor is to be used as C axis and spindle, the two CNC tables
must have the same value for the DRIBUSID parameter.
If the zero identifier is assigned to a drive, that module will be ignored, even
when the ring stays closed for all purposes for the rest of the drives. That drive
may receive an analog velocity command and be adjusted through the serial
line.
Example
For example, a machine has four drives identified as 1, 2, 3 and 4. To ignore
the second one, another one must be renamed so they are consecutive. The
easiest solution for a situation like this will be 1, 0, 3 and 2.
NOTE. Remember that the DRIBUSID parameters of the CNC can also be
modified the same way.
If the drive is going to be identified in the SERCOS ring with a number higher
than 15, this value cannot be selected using the rotary "NODE SELECT"
switch because it only has 15 positions. Identifying axes in the ring with
addresses higher than 15 requires setting QP13. See this parameter in
chapter 13 of the "man_dds_soft.pdf" manual.
Example
How to identify an axis addressed in position 24 in the system SERCOS
ring?
When the identifier of the axis in the ring is higher than 15 (like in this case),
QP13 must be set so it meets the ratio:
Defined ID = ID to be selected at the rotary switch + (15 x QP13).
defined ID = 24
Hence, for
"NODE SELECT" switch (same as 9) and set QP13=1.
, select the A position at the drive's rotary
   Installation
8.
DDS
HARDWARE
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