Siemens SINAMICS S120 Function Manual page 254

Extended Functions
Function module "basic positioner"
Note
When using PROFIdrive telegram 110, the velocity override is already
interconnected and must be supplied via the telegram.
Software limit switches
The connector inputs p2578 (software limit switch minus) and p2579 (software limit
switch plus) limit the position setpoint if the following prerequisites are fulfilled:
S The software limit switches are activated (p2582 = "1")
S The reference point is set (r2684.11 = 1)
S The modulo correction is not active (p2577 = "0")
The connector inputs are, in the factory setting, linked to the connector output
p2580 (software limit switch minus) and p2581 (software limit switch plus).
Stop cam
A traversing range can, on one hand, be limited per software using the software
limit switches and on the other hand, the traversing range can be limited per hard-
ware. In this case, the functionality of the stop cam (hardware limit switch) is used.
The function of the stop cam is activated with the 1 signal at binector input p2568
(activate stop cam).
After the enable, the activity of the binector inputs p2569 (stop cam minus) and
p2570 (stop cam plus) is checked. These are low active; this means if a 0 signal is
present at binector input p2569 or p2570, then these are active.
When a stop cam (p2569 or p2570) is active, the actual motion is stopped with the
maximum deceleration (p2573) and the appropriate status bit r2684.13 (stop cam
minus active) or r2684.14 (stop cam plus active) is set.
When stop cams are actuated, only motion that allows the axis to move away from
the stop cam is permitted (if both stop cams are actuated, then no motion is possi-
ble). When the stop cam is exited, this is identified by the 0/1 edge in the permitted
traversing direction and this means that the corresponding status bits (r2684.13 or
r2684.14) are reset.
4-254
© Siemens AG 2006 All Rights Reserved
SINAMICS S120 Function Manual, 03/2006 Edition