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CPU modules
3.1 CPU module CPU550/CPU551
Memory
SDRAM
•
•
Synchronous L2/L3 cache
SRAM
Buffered SRAM (by means of external battery in
the rack) contains the following data that must be
backed up to retentive memory on power failure:
•
•
•
Module slots
Number
Allocation of the slots
Equipped by the user.
1)
PMC plug-in cards are currently not provided.
2)
Time
Resolution
66
During initialization, the user program is
loaded from program memory and expanded
(Boot Flash is available separately)
Data memory for the operating system,
communication, message buffer, and Trace
Fault diagnostics of the operating system
("exception buffer")
Max. 1000 process variables, configured
using the SAV function block
Data recorded using the Trace function or the
message system (SRAM can be optionally
configured)
32 / 128 MB
512 KB/2 MB / 8 MB
256 / 512 KB
3
Program memory MC5xx
•
Software protection
•
1)
PMC plug-in cards
•
2)
0.1 ms
System Manual, 12/2013, A5E01114865-07
SIMATIC TDC hardware
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