Siemens SIMATIC S5 Manual page 161

IP 266
• G90: Absolute position specifications
G91: Relative position specifications
These two G functions control the interpretation of all target specifications
(X functions).
G90: Position specifications are interpreted as absolute values
G91: Position specifications are interpreted as relative values
These two G functions control the interpretation of all target specifications
(X functions).
The X function
In this function, the character "X" is followed by a target coordinate for the
positioning operation.
The target coordinate may be specified as either an absolute or relative value
(can be selected via G90/G91).
The numerical value may comprise up to five integer and three decimal places
and a sign.
Max. +32767.999
Min. - 32767.999
The decimal point may be omitted if the value has no decimal places, and is then
assumed to be located at the last position in the target specification.
If BCD format was specified in the machine data, the target coordinate must be in
the range from + 9999.999 to - 9999.999.
EWA 4NEB 812 6057-02
Machine Data, Modes and Traversing Programs
5-89