Siemens S7-300 - Page 109

Settings
10.3 Set zero offset
FM 352 electronic cam controller
Operating Instructions, 05/2011, A5E01071724-03
109
Effects on a rotary axis
Based on the example of a zero offset by -45° , you can see how this setting rotates the
coordinate system:
Table 10- 3 Rotation of the coordinate system as a result of zero offset
Tool at ACT = 340° Tool when ACT = 25°
B
B
r
r
$&78$/ r
$&78$/ r
=32 r
The zero position rotates by - 45 degrees. All axis points are assigned new coordinate values.
Including a ZPO
old
= 0, the result is a new value of 385°
As actual value resumes at 0 at the end of the rotary axis operating in positive directional
rotation, the calculation returns an actual value of 25°:
Coordinate
new
= Coordinate
old
- (ZPO
new
- ZPO
old
) - end of rotary axis
The end of rotary axis value only needs to be subtracted when
Coordinate
old
- (ZPO
new
- NPV
old
) is greater than the end of rotary axis.
Loss of synchronization
If synchronization is lost due to an error, or reset due to "retrigger reference point", a zero
offset is retained.
Canceling a setting
A zero offset of 0 resets any existing offset.