Siemens Sinamics S120 Function Manual page 360

Function modules
7.8 Basic positioner
This limit is only effective in the positioning mode for:
● Jog mode
● Processing traversing blocks
● Direct setpoint input/MDI for positioning/setting-up
● Reference point approach
Maximum acceleration/deceleration
Parameter p2572 (maximum acceleration) and p2573 (maximum deceleration) define the
maximum acceleration and the maximum deceleration. In both cases, the units are 1000
LU/s
Both values are relevant for:
● Jog mode
● Processing traversing blocks
● Direct setpoint input/MDI for positioning and setting up
● Reference point approach
The parameters do not have any effect when faults occur with the fault responses OFF1 /
OFF2 / OFF3.
In the traversing blocks mode, the acceleration and deceleration can be set in multiple
integer steps (1 %, 2 % ... 100 %) of the maximum acceleration and deceleration. In "direct
setpoint input/MDI for positioning and setting up" operating mode, the acceleration/delay
override (assignment of 4000 hex = 100%) is specified
Note
A maximum acceleration or deceleration dependent on the actual velocity (transitioned
acceleration) is not supported.
Note
When using the PROFIdrive telegram 110, the velocity override is already connected and
has to be supplied by 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:
● The software limit switches are activated (p2582 = "1")
● The reference point is set (r2684.11 = 1)
● 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).
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Function Manual, (FH1), 01/2012, 6SL3097-4AB00-0BP2
Drive functions