Siemens SINUMERIK 840C - Manual (Page 274)

08.96 6 NC Machine Data (NC MD), NC Setting Data (NC SD)
6.6.1 General MD bits (general bits)
Bit 4 When bit 4 is set, the polar coordinate angles (G10, G11, G12, G13) can be
programmed as either absolutes (G90) or increments (G91) in the block (also see
NC MD 5007, bit 5).
Active: In the next block
Example:
N1 G0 G90 X0 Y0 LF (approach P1)
N2 G11 X0 Y0 A30 B30 F500 LF (define Pol1 and traverse to P2)
N3 G91 A30 LF (Pol1 is maintained, exit P2)
N4 A30 B40 LF
(Pol1 is maintained, traverse to P3)
N5 M30 LF (traverse from P3 to P4)
Y
X
60°
P1=Pol 1
N4
P3
P4
B30
B30
B40
N3
30°
N2 P2
Bit 3 Bit 3 = 1: The old "PRESET OFFSET" is automatically retained following Power
On and reference point approach.
Active: NC Stop
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SINUMERIK 840C (IA)