Siemens SINUMERIK 828D

Flexible NC programming
1.23 Checksum calculation using an array (CHECKSUM)
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146 Programming Manual, 07/2010, 6FC5398-2BP40-0BA0
1.23 Checksum calculation using an array (CHECKSUM)
Function
The CHECKSUM command can be used to calculate the checksum using an array. This check-
sum can be compared with the result of an earlier checksum calculation to ascertain whether
the array data has changed.
Application
Check to see whether the initial contour has changed during stock removal.
Syntax
DEF INT <error>
DEF STRING[<string length>] <checksum>
DEF ... <array>[<n>,<m>,<o>]
<error>=CHECKSUM(<checksum>,"<array>"[,<start column>,<end column>])
Significance
CHECKSUM: Command for calculating the checksum using an array.
Variable for returning the error value.
Type. INT
0 No error
1 Symbol not found
2 No array
3 Index 1 too large
4 Index 2 too large
5 Invalid data type
<error>:
Value:
10 Check sum overflow
Result variable to which the result of the checksum calculation is
written (call-by-reference parameter)
Type: STRING
<checksum>:
Required string length: 16
The checksum is indicated as a
character string of 16 hexadecimal
numbers. However, no format
characters are indicated.
Example: "A6FC3404E534047C"