Siemens S5-100U - Page 118

Addressing S5-100U
The following table gives an overview of the most important system data in the system data area.
Table 6-6. System Data Area Assignment
System data
word
Contents
Chapter/
Section Reference
5 to 7 ISTACK (Interrupt STACK) 5.2
8 to 12 Integral real-time clock 12
33 First free program memory address
35 Program memory starting address
37 Program memory end address
40 to 45 CPU version, software release
57 to 63 SINEC L1 13
96 Scan monitoring time (value
.
10 ms)
97 Calling interval for OB 13 for time-controlled program
processing (value
.
10 ms)
7.4.4
128 to 159 BSTACK (Block STACK) 5.3.2
203 to 214 ISTACK (Interrupt STACK) 5.2
6-16 EWA 4NEB 812 6120-02