Siemens SINUMERIK 880 Programming Manual page 235

11 Programming of Cycles
11.10 NC-specific functions
The program loop is run through until an intersection is found.
Rn
1st call @710 50
@711
2nd call @710 50
@711
3rd call @710 100
@711
After the 3rd call, the intersection in this example is found at X=90 (R71) and Z=120 (R72).
@713 <Var >
With this command, the numerical value corresponding to the safety gap of 1 mm in the
current input format is loaded in the R parameter defined with <Var> (for G70 =
0.03937 and G71 = 1). In the R parameters immediately following, the numerical value
"1" is loaded in the case of radius programming and "2"in the case of diameter pro-
gramming. The permissible parameter range for <Var> is R0 to R98 and R900 to R998.
@714
With this command, "STOP-DEC", block preparation (decoding) is stopped until the buffer
is empty.
When the program is being executed, several program blocks are decoded in advance in
the control and loaded into the buffer of the NC. As a result, program execution is faster,
but together with certain NC commands (reading of actual values, measurements, data
transfer NC-PLC) this can lead to errors occurring in the course of the program. By
means of the STOP-DEC command (stop decoding), the advance decoding of NC blocks
written after this command is stopped until the block containing the STOP-DEC command
has been executed. This results in the buffers being emptied and information required in
the next NC blocks being made available.
The STOP-DEC instruction must be programmed for the following information from the
interface control, provided it is required in the next NC blocks:
• Machine data
• Setting data
• Tool offsets
• Zero offsets
• R parameters
• "Mirror" signal
• Axis/spindle converter
The STOP-DEC command must be programmed in its own channel each time before
reading actual values and after each measurement.
11–48
Rn 1 Rn 2 Rn 3 Rn
+ + +
250 50 200
INTERSECTION FOUND ?
200 100 150
INTERSECTION FOUND ?
150 50 100
INTERSECTION FOUND ?
© Siemens AG 1991 All Rights Reserved
4 Rn 5 Rn 6 Rn
+ + + +
0 0 1
No: Rm = 0
0 -50 3
No: Rm = 0
-50 0 3
Yes:
Rm = 1
6ZB5 410-0HD02
SINUMERIK 880, (PG)
05.91
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