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11.8 Line checksums and MD numbers in MD files (software version 3.2 and higher)
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Siemens AG 2000 All Rights Reserved
SINUMERIK 840D Installation and Start-Up Guide (IAD) – 04.00 Edition
11.8 Line checksums and MD numbers in MD files (software
version 3.2 and higher)
A check facility has been created through the introduction of line checksums to
backup files for machine data (INI and TEA files).
The purpose of introducing machine data numbers (MD numbers) in the backup
files is to facilitate the communication of machine data values for servicing pur-
poses and automatic processing of MD backup files in some cases.
By saving the files themselves, it is possible to dispense with the “Manufacturer”
write authorization when these backed-up files are read in again.
The following two subsections describe line checksums and machine data num-
bers in detail.
11.8.1 Line checksums (MD 11230 MD_FILE_STYLE)
A line checksum
S A line checksum is only generated for lines with machine data assignments.
S The line checksum is positioned immediately after the machine data assign-
ment preceded by a blank space and apostrophe.
S The checksum consists of 4 HEX characters
S The line checksum is only ever generated by the control on creation of an
MD backup file and not by external editors on PC or PG.
S Is activated via MD 11230 MD_FILE_STYLE.
S A line checksum can be output together with machine data numbers.
S “; <Comment>” can be added later to lines with checksums without affecting
the sum check.
If
MD11230
=
Output 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 num-
ber and line check-
sum
N20070$MC_AXCONF_MACHAX_USED[0]=1 ’2F34
Properties of the
line checksums
MD 11230
MD_FILE_STYLE
11 Data Backup08.99
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