Siemens SINUMERIK 840Di Function Manual page 1460

Detailed Description
2.4 Referencing with incremental measurement systems
• The measuring system has already been successfully referenced with reference point
Encoder status = 2:
• The machine axis was disabled in "Exact stop fine" status.
Note
As part of the actual value buffering, the axis-specific interface signal:
DB31, ... DBB60.7 (position reached with exact stop fine)
is evaluated.
The actual values of machine axes that do not use the signal cannot be buffered.
Functional sequence
Two different cases apply for automatic referencing, which depend on the encoder status:
• Case 1: Encoder status = 2
• Case 2: Encoder status = 1
2-20
approach.
This is identified by the NC by changing the encoder status from 1 to 2.
Encoder is referenced, an exact stop is reached, and automatic referencing is
active the next time the encoder is activated.
Automatic referencing in parameterized, the measuring system has been referenced and
the machine axis was switched off in status "Exact stop fine".
As a result:
– The actual value system of the machine axis is synchronized with the buffered actual
value.
– The status of the machine axis is set to "Referenced".
DB31, ... DBB60.4/60.5 (referenced/synchronized 1/2) = 1
Automatic referencing in parameterized but the measuring system has either not yet been
referenced or the machine axis was not switched off in status "Exact stop fine".
As a result:
– The actual value system of the machine axis is synchronized with zero.
– The status of the machine axis is set to "Not referenced":
DB31, ... DBB60.4/60.5 (referenced/synchronized 1/2) = 0
Reference Point Approach (R1)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0