Siemens SIMATIC FM 452, Руководство пользователя

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Settings
9-20
FM 452 Electronic Cam Controller
C79000-G7076-C452-04
Data Used in the Channel DB
Address Name Type Initial Value Comment
34.3 REFTR_ON BOOL FALSE 1 = retrigger reference point
25.0 SYNC BOOL FALSE 1 = axis is synchronized
Data Used in the Parameter DB
Address Name Type Initial Value Comment
44.0 REFPT DINT L#0 Reference point coordinate
52.0 RETR_TYPE DINT L#0 Type of retrigger reference point
Effects of the Setting
•
The FM 452 evaluates the zero marker and the reference point switch
depending on the direction of movement of the axis.
– If movement is in a positive direction, the rising edges are evaluated.
– If movement is in a negative direction, the falling edges are evaluated.
•
The actual position is set to the value of the reference point coordinate.
•
The working range is physically displaced on the axis.
•
The individual points retain their original value, but are now located at new
physical positions.
•
Cam status changes that would normally trigger an interrupt can be lost.
•
The SYNC bit is set in the return signals.
Note
Note the switching response of time cams in Section 9.1, page 9-2.
Example
The following applies to the example:
•
The rising edges of the reference point switch and zero marker are evaluated
(axis moving in a positive direction).
•
The reference point coordinate has a value 300 mm.
•
No zero offset is active at the time of execution.