05.91 11 Programming of Cycles
11.4 Program branches
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Main group 1/subgroup 6: FOR-DOWNTO loop
@161 <Var> <Value> <Const>
The FOR-DOWNTO loop is a counting loop in which the contents of the R parameter
defined in <Var> are decremented with each pass. The scanning for ”equal to” is made
at the beginning of the loop. As long as there is inequality, the loop is processed,
otherwise a jump is made to the block defined in <Const>.
At the end of the loop, the variable <Var> must be decremented (@621) and an
absolute jump made to the beginning of the loop.
Example:
R5 = 10 R51 = 5 R52 = 1 Value assignments for parameters R5, R51, R52
@201 R50 P51 Data transfer from R51 to R50
N600 @161 R50 R52 K605 Beginning of FOR DOWNTO loop
.
.
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@621 R50
@100 K–600
N605
11.5 Data transfer, general
The main group 2 is organized as follows:
@
2 x y Three-digit @ code
0: Delete a parameter value
1: Load a parameter
2: Exchange of parameter contents
0: Data transfer R parameter/R parameter
1: Data transfer R parameter/input buffer for numerical variables
2: Main group 2
© Siemens AG 1991 All Rights Reserved 6ZB5 410-0HD02 11–11
SINUMERIK 880, (PG)
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