Siemens S7-300 - Set Zero Offset

Settings
10.3 Set zero offset
FM 352 electronic cam controller
Operating Instructions, 05/2011, A5E01071724-03
107
10.3 Set zero offset
Definition
The "zero offset" setting lets you shift the zero position in the coordinate system by a defined
value. The sign determines the offset direction.
Determining a new coordinate
All values of the shifted coordinate system can be calculated according to the following
formula:
Coordinate
new
= Coordinate
old
- (ZPO
new
- ZPO
old
)
ZPO
old
identifies any existing zero offset. If no zero offset was active prior to the call, set a 0
value at ZPO
old
.
Based on this formula, you can calculate the coordinates for the software limit switches, for
example.
Programming steps
1. Write the zero offset value to the channel DB.
– Linear axis:
The zero offset must be selected so that the software limit switches remain within the
permissible traversing range after the setting is called.
– Rotary axis:
Rule for the zero offset:
value of zero offset ≤ end of the rotary axis.
2. Set the relevant trigger bit.