Siemens SINAMICS S120 Function Manual page 256

Extended Functions
Function module "basic positioner"
Notice
Referencing distance-coded zero marks is not supported.
Description
After a machine has been powered-up, for positioning, the absolute dimension
reference must be established to the machine zero. This operation is known as
referencing.
The following referencing types are possible:
S Setting the reference point (all encoder types)
S Incremental encoders
Active referencing (reference point approach (p2597 = 0)):
– Reference cams and encoder zero mark (p2607 = 1)
– Encoder zero mark (p0495 = 0)
– External zero mark (p0495 0 0)
Flying referencing (passive (p2597 = 1))
S Absolute encoder
– Absolute encoder adjustment
– Flying referencing (passive (p2597 = 1))
A connector input is provided for all referencing types to input the reference point
coordinate; this allows, e.g. the change/input via the higher-level control. However,
to permanently enter the reference point coordinate, a setting parameter for this
quantity is also required. As standard, this setting parameter p2599 is interconnec-
ted to connector input p2598.
Set reference point
The reference point can be set using a 0/1 edge at binector input p2596 (set refer-
ence point) if a traversing command is not active or was interrupted by an inter-
mediate stop and the drive is operational. The coordinate in p2598 is transferred
into the actual position and becomes valid as reference point.
As standard, connector input p2598 is connected to setting parameter p2599. The
binector input is not effective for the traversing task being presently executed.
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© Siemens AG 2006 All Rights Reserved
SINAMICS S120 Function Manual, 03/2006 Edition