Set Zero Offset - Siemens S7-300 Operating Instructions Manual

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
ZPO
value at ZPO
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.
2. Set the relevant trigger bit.
FM 352 electronic cam controller
Operating Instructions, 05/2011, A5E01071724-03
= Coordinate
new
identifies any existing zero offset. If no zero offset was active prior to the call, set a 0
old
.
old
– 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.
- (ZPO - ZPO )
old new old
Settings
10.3 Set zero offset
107