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101

Enhancements in Late Model CPUs

F-6

SIMATIC 545/555/575 System Manual

F.3 Memory Capacity of the 555–1106 CPU

Due to internal CPU requirements, it was previously necessary to reduce

the amount of memory available to the user in a 505–1106 CPU by 64

Kbytes compared to the 555–1102 and 555–1104 (1920 Kbytes in the earlier

model CPUs vs. 1856 Kbytes in the –1106 CPU). Now a method has been

implemented to re-allocate internal memory usage to allow the maximum

size 555–1102/4 RLL program to fit into a 555–1106 CPU.

This insures that a previous 555–1104 program will load into a 555–1106,

but does not guarantee that it will have enough room to compile. However,

an investigation into the memory usage of a number of large user programs

indicates that the program will most likely compile as well, but you will

need to try it to be sure. This change will not help in unusual situations

where most of the memory is used as V-Memory to store data or U-Memory

to store a compiled XSUB program.

Difference in

Memory Capacity

between the

555–1106 CPU and

Earlier CPUs

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