Siemens SIMATIC FM 452, Manual

Page: 102 / 210

Settings
9-4
FM 452 Electronic Cam Controller
C79000-G7076-C452-04
Data Used in the Channel DB
Address Name Type Initial Value Comment
36.4 AVAL_EN BOOL FALSE 1 = set actual value
36.5 FVAL_EN BOOL FALSE 1 = set actual value on-the-fly
90.0 AVAL DINT L#0 Coordinate for actual value
94.0 FVAL DINT L#0 Coordinate for flying actual value
25.5 FVAL_DONE BOOL FALSE 1 = set actual value on-the-fly executed
Effects of the Setting
Based on the example “set actual value” to 400 mm (at position 200 mm), you can
see how this setting shifts the coordinate system. The following effects result:
•
The location of the working range is not physically shifted.
•
The individual points (such as the software limit switches) are assigned new
coordinate values.
•
The cams retain their coordinate values and are therefore located at a different
physical position.
•
When the axis is synchronized and the cam processing is enabled, the actual
position can skip cam edges or complete cams as a result of this setting.
•
Status changes of the cam which would normally trigger an interrupt can be
lost.
Note
Note the switching response of time cams in Section 9.1, Page 9-2.