Siemens SINUMERIK 840C Installation Instructions Manual page 273

6 NC Machine Data (NC MD), NC Setting Data (NC SD)
6.6.1 General MD bits (general bits)
Bit 5 When bit 5 is set, the interpolation parameters (I, J, K) can be programmed either as
absolutes (G90) or as increments (G91) in the block (also see NC MD 5007,
bit 5). The interpolation parameters for contour definitions (blueprint programming)
must always be specified incrementally (G91), regardless of whether bit 5 is set or not.
Active:
Example:
N1
N2
N3
N4
N5
When the interpolation parameters are specified as absolutes, the centre point of
the circle refers to the centre point of the workpiece and not the starting point of the
circular path of the circle.
If an interpolation parameter was not programmed because it was "0", the G
function, which also precedes the programmed interpolation parameter, also refers
to the interpolation parameter that was not programmed.
Example:
G02
G02
6–88
More user manuals on
In the next block
G0 G90 X80 Y55 F500
G02 X50 Y85 I50 J55
L F
G01 X50 Y75
G03 X50 Y35 I50 J55
L F
M30
Y
85
75
55
35
X50 Y60 G91 I..
X50 Y60 G90 I..
ManualsBase.com
L F
L F
F500
L F
N3
G03
N4
G02
N2
50 80
J = 0 need not be programmed. G91 refers to
both I and to the non-programmed J.
J = 0 need not be programmed. In this case, G90
lies in the workpiece centre point. Circle end
position error is displayed (alarm 2048).
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Siemens AG 1992 All Rights Reserved
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SINUMERIK 840C (IA)