Relative Zero Offset (Zo) (Mode 13) - Siemens SIMATIC S5 Manual

Machine Data, Modes and Traversing Programs

5.3.13 Relative Zero Offset (ZO) (Mode 13)

Relative zero offset
Mode
In contrast to mode 12, this mode allows you to specify the direction of the offset
by selecting the "Forward" or "Reverse" function. You can also, of course, specify
the offset direction by signing the offset value.
This mode does not require that a reference point be set.
The true direction of a zero offset is determined by
• the sign of the offset value
and
• the selected function.
Each time this mode is started, the zero offset is summated as shown in
Figure 5-15.
A zero offset can be reset only via mode 14 or by "power off".
Note:
An absolute zero offset overwrites a relative zero offset.
Table 5-15. Coordinate Changes Produced by a Zero Offset
Sign of the value Start function
Positive
Negative
Positive
Negative
The new actual value thus computes to
• Actval = Actval
new old
• Actval = Actval
new old
5-54
Value
Parameters
Coordinates become
Forward more negative
Forward more positive
Reverse more positive
Reverse more negative
- ZO when the direction is "Forward"
+ ZO when the direction is "Reverse"
IP 266
Forward/Reverse
Function
EWA 4NEB 812 6057-02