Referencing With Incremental Measuring Systems - Siemens SINUMERIK 808D Function Manual

IS "Active machine function REF" (DB3100.DBX0001.2)
The reference point approach is performed with the REF machine function activated (IS "active machine function REF"). The
REF machine function can be selected in "JOG" mode (IS "REF machine function" (DB3000.DBX0001.2)).
Axis specific referencing
Axis-specific referencing is started separately for each machine axis with the "plus/minus traversing keys" interface signal
(DB380x.DBX0004.7 /.6). All axes can be referenced at the same time. If the machine axes are to be referenced in a
particular sequence, the following options are available:
● The operator must observe the correct sequence when starting.
● The PLC user program checks the sequence on start-up or defines the sequence itself.
● The order is defined in MD34110 REFP_CYCLE_NR (see channel-specific referencing)
Channel specific referencing
Channel-specific referencing is started with the "activate referencing" interface signal (DB3200.DBX0001.0). The control
acknowledges a successful start with IS "Referencing active" (DB3300.DBX0001.0). Each machine axis assigned to the
channel can be referenced with channel-specific referencing (this is achieved internally on the control by simulating the
plus/minus traversing keys). Axis-specific MD34110 REFP_CYCLE_NR (axis sequence for channel-spec. referencing) can
be used to define the sequence in which the machine data is referenced. If all axes entered in MD34110 REFP_CYCLE_NR
have reached their end points, the "All axes referenced" interface signal (DB3300.DBX0004.2) is enabled.
Special features
● Referencing is aborted with "Reset" interface signal (DB3000.DBX0000.7). All axes that have not reached their reference
point by this time are considered to be not referenced. IS "Referencing active" is reset and alarm 20005 is signaled.
● Working area limiting and software limit switches are not active for non-referenced machine axes.
● The defined axis-specific accelerations are observed at all times during referencing (except when alarms occur).
● The reference point approach can be started only with the direction key for the direction stored in
MD34010 REFP_CAM_DIR_IS_MINUS.
Referencing in the part program
One or more axes that have lost their reference can be referenced at the same time. The sequence of the individual phases
is identical to axis-specific referencing, except that the process is started with the G74 command instead of the plus/minus
traversing keys and is done via the machine axis identifiers.
Reference:
SINUMERIK 808D/SINUMERIK 808D ADVANCED Programming and Operating Manual
Note
MD20700 REFP_NC_START_LOCK = 1 prevents a part program from being started (alarm output) if not all required axes
are referenced.
16.2

Referencing with incremental measuring systems

Time sequence
The referencing sequence for incremental measuring systems can be subdivided into three phases:
1. Phase: Traversing to the reference cam
2. Phase: Synchronization with the zero mark
3. Phase: Traversing to the reference point
Function Manual
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