Siemens SINAMICS S120 Function Manual page 472

Function modules
9.8 Basic positioner
The traversing range is limited using software limit switches only if the following requirements
are met:
● 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 limit is implemented using the connector inputs p2578 for the software limit switch minus
and p2579 for the software limit switch plus. In the factory settings, the connector inputs are
linked to the connector output p2580 for the software limit switch minus and p2581 for the
software limit switch plus. Using parameters p2580 and p2581, you can set the desired end
positions of the software limit switch.
Limiting the traversing range using hardware limit switches
When this procedure is used, the converter limits the traversing range of a linear axis using
hardware limit switches (STOP cams).
The traversing range is limited using hardware limit switches only if the following requirements
are met:
● The hardware limit switches are activated (p2568 = 1).
The signals of the hardware limit switches are evaluated using the digital outputs of the
converter. There are two available methods for evaluating the hardware limit switches:
● Edge-triggered evaluation (factory setting)
● Level-triggered evaluation
For limiting the traversing range using hardware limit switches, edge-triggered evaluation has
been configured as a factory setting. The signals are evaluated using the binector inputs p2569
for the hardware limit switches minus and p2570 for the hardware limit switches plus. The state
of the hardware limit switches is "active" if the signals of the hardware limit switches are
recognized as "0" at the binector inputs.
You can test the function of the hardware limit switches by running up to the hardware limit
switches in position-controlled operation of the axis (e.g. with the "jog" function).
Moving beyond the hardware limit switches (STOP cams)
For maintenance work, it may be necessary for the axis to traverse beyond the activated
hardware limit switches (STOP cams).
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Function Manual, 06/2019, 6SL3097-5AB00-0BP2
Drive functions