
Machine Data, Modes and Traversing Programs IP 266
5.3.13 Relative Zero Offset (ZO) (Mode 13)
ValueRelative zero offset
Mode
Forward/Reverse
FunctionParameters
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 Coordinates become
Forward
Forward
Reverse
Reverse
Positive
Negative
Negative
Positive
more negative
more positive
more positive
more negative
The new actual value thus computes to
• Actval
new
= Actval
old
- ZO when the direction is "Forward"
• Actval
new
= Actval
old
+ ZO when the direction is "Reverse"
5-54
EWA 4NEB 812 6057-02
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