11
03/2006
11.12 Line checksums and MD numbers in MD files
11-260
© Siemens AG 2006 All Rights Reserved
SINUMERIK 840D/810D Start-Up Guide (IADC) – 03/2006 Edition
11.12 Line checksums and MD numbers in MD files
Line checksums have been introduced when creating back-up files for machine
data (INI and TEA files). This means that they can not be checked.
The introduction of MD (machine data numbers) into the back-up files makes it
easier to understand the machine data values when servicing is required and, if
necessary, allows machine data back-up files to be processed automatically.
By backing up the files, the “Manufacturer” write access right can be avoided
when restoring.
The two sections below give detailed information about line checksums and
machine data numbers.
11.12.1 Line checksums (MD 11230 MD_FILE_STYLE)
A line checksum
S is generated only for lines with machine data assignments.
S is positioned directly after the machine data assignment, preceded by a
blank and apostrophe.
S comprises 4 HEXA characters.
S is only generated by the control when a machine data back-up file is genera-
ted. It is not created by external editors on the PC or PG.
S is activated via MD 11230 MD_FILE_STYLE.
S can be output together with machine data numbers.
S “; <comment >” can be added later without affecting the sum check.
If MD
11230=
then output of Example
0 MD name $MC_AXCONF_MACHAX_USED[0]=1
1 MD name with line
checksum
$MC_AXCONF_MACHAX_USED[0]=1 ’2F34
2 MD name and MD
number
N20070$MC_AXCONF_MACHAX_USED[0]=1
3 MD name, MD
number and line
checksum
N20070$MC_AXCONF_MACHAX_USED[0]=1 ’2F34
When machine data files are read in with valid line checksums, no write access
right is needed.
Properties of
line checksums
MD 11230
MD_FILE_STYLE
Evaluating line
checksums
11 Data Back-U
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