Siemens SINAMICS S120 Function Manual page 465

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If a signal at binector input p2613 (reversing cam, MINUS) or at binector input p2614

(reversing cam, PLUS) is detected during reference point approach, the search direction is

If the minus reversing cam is approached in the positive direction of travel or the plus

reversing cam in the negative direction of travel, fault F07499 (EPOS: reversing cam

approached with the incorrect traversing direction) is output. In this case, the wiring of the

reversing cams (BI: p2613, BI: p2614) or the direction of approach to the reversing cam must

The reversing cams are low active. If both reversing cams are active (p2613 = "0" and p2614

= "0"), the drive remains stationary. As soon as the reference cam is found, then

synchronization to the reference zero mark is immediately started (refer to step 2).

If the axis leaves its start position and travels the distance defined in parameter p2606 (max.

distance to reference cam) heading towards the reference cam without actually reaching the

reference cam, the drive remains stationary and fault F07458 (reference cam not found) is

If the axis is already located at the cam, when referencing is started, then traversing to the

reference cam is not executed, but synchronization to the reference zero mark is

immediately started (refer to step 2).

The velocity override is effective during the search for the cam. By changing the encoder

data set, status signal r2684.11 (reference point set) is reset.

The cam switch must be able to supply both a rising and a falling edge. For a reference point

approach with evaluation of the encoder zero mark, for increasing actual position values the

0/1 edge is evaluated and for decreasing actual position values, the 1/0 edge. Inversion of

the edge evaluation is not possible at the sensor zero mark.

If the length measuring system has several zero marks which repeat at cyclic intervals (e.g.

incremental, rotary measuring system), you must ensure that the cam is adjusted so that the

same zero mark is always evaluated.

The following factors may impact the behavior of the "reference cam" control signal:

• Switching accuracy and time delay of reference cam switch

• Position controller cycle of drive

• Interpolation cycle of drive

• Temperature sensitivity of machine's mechanical system

Drive functions

Function Manual, (FH1), 01/2013, 6SL3097-4AB00-0BP3

Function modules

7.8 Basic positioner