Efficient Networks Siemens Sinamics S120 - Manual (Page 274)

Function modules
7.9 Basic positioner
Drive Functions
274
Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4
Note
If the drive is in fixed stop, it can be referenced using the control signal "set reference point."
If the axis leaves the position that it had at detection of the fixed stop by more than the
selected monitoring window for the fixed stop p2635, then the status bit r2683.12 is reset. At
the same time, the speed setpoint is set to zero, and the alarm F07484 "fixed stop outside of
the monitoring window" is triggered with the reaction OFF3 (quick stop). The monitoring
window can be set using the parameter p2635 ("Fixed stop monitoring window"). It applies to
both positive and negative traversing directions and must be selected in such a way that only
a breaking away causes the alarm to be triggered.
7.9.5.3 Fixed stop is not reached
If the braking point is reached without the "fixed stop reached" status being acknowledged,
then the fault F07485 "Fixed stop is not reached" is output with fault reaction OFF1, the
torque limit is cancelled and the drive cancels the traversing block.
Note
•
The fault can be changed into a warning (see chapter: "Message configuration" in the
Commissioning Manual IH1), so that the drive continues processing with the specified
block relaying.
• The target point must be sufficiently far inside the workpiece.
7.9.5.4 Cancel
The "traverse to fixed stop" traversing task can be interrupted and continued using the
"intermediate stop" signal at the binector input p2640. The block is cancelled using the
binector input signal p2641 "Reject traversing task" or by removing the controller enable. In
all of these cases, the drive is correspondingly braked. When cancelling occurs, it is ensured
that an almost-achieved fixed stop (setpoint already beyond the fixed stop, but still within the
threshold for fixed stop detection) will not result in damage. To do this, the setpoint is
updated after the standstill (position setpoint = actual position value). As soon as the fixed
stop is reached, the drive remains in fixed stop even after cancellation. It can be moved on
from the fixed stop using jogging or by selecting a new traversing task.
Note
The fixed stop monitoring window (p2635) is only activated when the drive is in fixed stop
and remains active until the fixed stop is exited.