Siemens SIMOVERT MASTERDRIVES Manual page 751

05.2006
9.4.40 Docking point between basic positioner [789b] and synchronism
[836]
Application example
Internal implementation
Parameter
Src SYNC local U885
ON Parameter
(binector)
U886
Src SYNC local
Parameter
(double word connector)
NOTE
Siemens AG 6SE7087-6QX70 (Version AG)
SIMOVERT MASTERDRIVES
The infeed point U886 makes it possible to link the "Basic positioner"
function block to technology option F01 in synchronous mode. The link
is activated via U885.
Index
1
1
2
U885 has higher priority than U837.8 ("Catch-up active"), i.e. when
U885==1 the infeed point U886 is activated regardless of the state of
U837.8.
The speed setpoint at U886.2 has the same standardization as the
value at U461.2 (100 % == 0x4000 0000).
The input for the position setpoint is compensated according to the axis
cycle.
When the synchronism setpoint source is switched from catch-up to the
external infeed at U886 (0 → 1 edge change at U885), the drive is
synchronized once with the position setpoint at U886.1 for the sake of
preventing a setpoint step change. On-the-fly transitions during other
changeovers in the new operating mode are not implemented. The user
must make external interconnections using free blocks to control the
occurrence of setpoint step changes (e.g. with a 1 → 0 edge change at
U885).
Fault-free interoperation between the basic positioner and synchronous
blocks is ensured only if the following conditions are met:
1. The free blocks "Basic positioner" and "Synchronism" must both
be computed in the same time slot. To ensure this condition is
met, the user must make the appropriate assignments between
the free blocks and the time slots (parameter settings).
2. The drive must be stopped via the catch-up function before U886
is connected in.
Undesirable effects (setpoint step changes, oscillations, etc.) may
otherwise occur.
Compendium Motion Control
"0" Setpoint source for synchronous branch is offset angle
setting / catch-up
"1" Connect setpoint input U886 into synchronous branch
Setpoint input for position setpoint in [LU
Setpoint input for speed setpoint in [%]
Technology Option F01
Meaning
9-103