11.2.1
Info
Memory configuration
The CPU 948 is available with two memory versions and you can
check the memory capacity using the PG function "memory
configuration". With this function, the following information about
the CPU user memory is transferred to the PG (from PG software
version V6.0 upwards with "Delta diskette" for the CPU 948):
•• memory capacity (640 Kbytes/1664 Kbytes)
•• longest free block of user memory
•• sum of all free blocks of user memory.
The PG software V6.3 with "Delta diskette" for the CPU 948 displays
the memory configuration exactly.
With older PG software versions (e.g. V3.0 or MT1.0) the memory
configuration is as for the CPU 946/947 (refer to Fig. 11-1). The total
memory configuration of the CPU 948 must then be calculated from
the total of the submodule values.
PLC info
SIMATIC S5 / OES0C
M e m o r y configuration S 5 1 5 5 U
Module Submod Type Start address End address Length
01
1
2
2
2
2
2
3
3
Longest free block of RAM
Sum of all free blocks of RAM
1
1
1
1
RAM
RAM
RAM
00000
10000
30000
Submod. empty / not plugged in
Submod. empty / not plugged in
Submod. empty / not plugged in
Submod. empty / not plugged in
0FFFF
2FFFF
4FFFF
64 KW
1)
1)
corresponds to the memory configuration of the CPU 948-1: 320 Kw = 640 Kbytes
128 KW
128 KW
: 314800 Words
: 315664 Words
F1
F2
F3
F4
F5
F6
OUTP ADDR
MEM CONF
SYSPAR BSTACK ISTACK RETURN
F7
F8
Fig. 11-1 PG display of the memory configuration
PG Functions
CPU 948 Programming Guide
11 - 6 C79000-G8576-C848-04
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