Siemens SINUMERIK 840C - Manual (Page 1009)

12 Functional Descriptions 12.93
12.22 Software cam (position measuring signals)
12.22 Software cam (position measuring signals)
The SOFTWARE CAM (position measuring signals) function is an option
and can only be used on linear axes.
12.22.1 Corresponding data
NC MD 310 Assignment cam output byte to synchr. user INTERF (in preparation)
NC MD 311 Assignment cam output byte to MIXED I/O bytes
SD 7000-7007 Cam positions of cam pairs
DB48 DR0.6 Activate cam/axis assignment
DB48 DR1.6 Cam/axis assignment activated
DB48 DR0.7 Transfer of cam values
DB48 DR1.7 Cam values transferred
DB48 DR1.5 NC changes cam values
DB32 DL121+m Cam signals of axis
DB32 DL123+m Cam pair for axis active
Software cam (position measuring signals) option
12.22.2 Functional description
The "software cam" function generates position measuring signals and can be parameterized
via setting and machine data. The setting data contain the axis positions of the individual cams
and organized in a cam value block. The cams are always assigned to the axis in pairs, each
consisting of a positive and a negative cam.
The positive and negative cams simulate an operating cam of infinite length which is activated
at a defined position (cam position) in a certain approach direction when the axis reaches the
cam position.
The status of the cams, the cam signals, are transferred to DB32 DL121+m in the IPO cycle
and/or output additionally via the output bytes of the MIXED I/O (assignment in NC MD 311).
The software cam function is fully operational and can be activated in all operating modes after
the appropriate axes have approached the reference point. It remains active even after RESET
or EMERGENCY STOP.
Cam pair and cam range
A cam pair consists of a positive and a negative cam. The axis range assigned to the positive
cam is greater than its cam position and the axis range assigned to the negative cam smaller
than its cam position.
The axis range assigned to the cam is referred to as the "cam range".
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SINUMERIK 840C (IA)