Siemens SINUMERIK 840Di Function Manual page 153

This specification can be made independently for each of the following part program
commands:
• Rapid traverse: G0
• Machining commands: G1, G2, G3, CIP, ASPLINE, BSPLINE, CSPLINE,
The setting is made for each channel with the following machine datum:
MD20550 $MC_EXACT_POS_MODE (exact stop conditions for G00 and G01)
Coding
Each exact stop criterion is location-coded:
• Ones position E: rapid traverse
• Tens position Z: all other part program commands in the first G-group
MD20550 $MC_EXACT_POS_MODE = <
Z or E
0
1
2
3
Example
MD20550 $MC_EXACT_POS_MODE = 02
Ones position = 2:
With rapid traverse, exact stop criterion G602 (exact stop window coarse) is always active,
irrespective of any programming in the part program.
Tens position = 0:
For traversing with all other part program commands of the first G-group, the exact stop
criterion programmed in the part program is active.
Assignable exact stop criterion for rapid traverse transitions in continuous path mode
The following channel-specific machine datum is used to assign the response at the block
change of part program blocks before and after rapid traverse blocks:
MD20552 $MC_EXACT_POS_MODE_G0_TO_G1 = < value >
Value
0
1
2
3
4
5
Continuous-Path Mode, Exact Stop, LookAhead (B1)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
POLY, G33, G34, G35, G331, G332, OEMIPO01, OEMIPO02, CT
Active exact stop criterion
Programmed exact stop criterion
G601 (exact stop window fine)
G602 (exact stop window coarse)
G603 (interpolator end)
Meaning
No additional stop at the block change
Stop at block change: response, as appropriate G601 (exact stop window fine)
Stop at block change: response same as for G602 (exact stop window coarse)
Stop at block change: response same as for G603 (interpolator end)
Like 0; in addition, the override of the next non-G00 block is taken into account with Look
ahead in the G00 block during the transition from G00 to non-G00.
Like 0; in addition, the override of the next block is taken into account with Look ahead
during the transition from G00 to non-G00 and non-G00 to G00.
ZE
>
Detailed Description
2.2 Exact stop
2-5