Siemens SIMATIC FM 452, Руководство пользователя, Страница: 107 / 210

Settings
9-9
FM 452 Electronic Cam Controller
C79000-G7076-C452-04
9.4 Set Reference Point
Definition
With the “set reference point” setting, you synchronize the axis. The setting shifts
the working area. All shifts resulting from a zero offset or from set actual value
remain in force.
Requirements
Cam processing must be switched off.
Sequence of the Setting
1. Enter the value for the reference point coordinate in the channel DB.
– Linear axis:
The reference-point coordinate must not be located outside the software
limit switches. This also applies to the reference point coordinate in a shifted
coordinate system.
– Rotary axis:
The following rule applies to the reference point coordinate:
0
≤
reference point coordinate
<
end of rotary axis
2. Set the appropriate trigger bit.
Date Used in the Channel DB
Address Name Type Initial Value Comment
36.3 REFPT_EN BOOL FALSE 1 = set reference point coordinates
98.0 REFPT DINT L#0 Reference point coordinates.
25.0 SYNC BOOL FALSE 1 = axis synchronized
Effects of the Setting
Based on the example “set reference point” to 300 mm, you can see how this
setting shifts the working range of the axis.
This has the following effects:
•
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 coordinates but are located at new
physical locations.
•
The SYNC bit is set in the return signals.