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Reading system data RS 120
CPU 948 Programming Guide
C79000-G8576-C848-04
By reading out system data RS 120, you can find out whether a "job"
was executed by writing the system data. The system program enters a
result code here.
Assignment of the system data when reading
After calling the software protection function, you can evaluate the
result code to find out whether the job was successful.
Address: E F078H
Table 8-18
Assignment of RS 120 (software protection) when reading
Bit no.
Assignment
15
0
14
Error bit: 0 = no error, 1 = error
13
0
12
0
11
0
10
binary
delete error
9
counter
8
7
0
6
0
5
0
4
1 = no password active
3
1 = deleting not possible, wrong password
2
1 = software protection (password) already
activated
1
1 = illegal password
0
1 = error counter overflow
Bit Assignment of the System Data Words
High byte
Low byte
8 - 37
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