Siemens SINUMERIK 840D sl Function Manual page 183

Assignable specification of the active exact stop criterion
The active exact stop criterion can be permanently specified for the part program commands
of the first G function group irrespective of the exact stop criterion programmed in the part
program. 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, POLY, G33, G34,
G35, G331, G332, OEMIPO01, OEMIPO02, CT
The setting is done in a channel-specific manner via the following machine data:
MD20550 $MC_EXACT_POS_MODE (exact stop conditions for G0 and G1)
Coding
Each exact stop criterion is location-coded:
MD20550 $MC_EXACT_POS_MODE = <ZE>
● Ones position E: Rapid traverse
● Tens position Z: all other part program commands in the first G function group
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 parts program.
Tens digit = 0:
For traversing with all other parts program commands of the first G function group, the exact
stop criterion programmed in the parts program is active.
Assignable exact stop criterion for rapid traverse transitions in continuous path mode
The behavior at the block transition of part program blocks before and after rapid traverse
blocks can be parameterized as follows:
MD20552 $MC_EXACT_POS_MODE_G0_TO_G1 = <value>
Value
0
1
2
3
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
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 transition.
Stop at block transition: Same behavior as in the case of G601 (Exact stop window fine)
Stop at block transition: Same behavior as G602 (Exact stop window coarse).
Stop at block transition: Same behavior as G603 (Interpolator end).
B1: Continuous-path mode, Exact stop, Look Ahead
4.2 Exact stop mode
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