
Starting Up the System
8-5
SIMATIC 545/555/575 System Manual
Table 8-2 545–1104/–1106 CPU Memory Configuration
Memory Type
Block
Allocation
Size
Memory
Required
per Block
Minimum
Size
Maximum
Size
Total Memory
Required for
Maximum Size
Default
Allocation
Total memory — — — 192 Kbytes — —
Ladder (L) 1 Kbyte 3 Kbytes 1 Kbyte 59 Kbytes 177 Kbytes 32 Kbytes
Variable (V) 1 Kbyte 1 Kbyte 1 Kbyte 177 Kbytes 177 Kbytes 52 Kbytes
Constant (K) 1 Kbyte 1 Kbyte 0 Kbytes 176 Kbytes 176 Kbytes 0 Kbytes
Special (S) 1 Kbyte 1 Kbyte 0 Kbytes 176 Kbytes 176 Kbytes 32 Kbytes
User (U) 1 Kbyte 1 Kbyte 0 Kbytes 176 Kbytes 176 Kbytes 0 Kbytes
Timer 1024
*
5 Kbytes 1024 20480 100 Kbytes 1024
Drum 64
*
3 Kbytes 64 2304 108 Kbytes 64
Shift Register 1024
*
1 Kbyte 1024 16384 16 Kbytes 1024
Table Move 1024
*
2 Kbytes 1024 14336 28 Kbytes 1024
One Shot 1024
*
1 Kbyte 1024 32768 32 Kbytes 1024
*
Number per block.
Table 8-3 555–1103 CPU Memory Configuration
Memory Type
Block
Allocation
Size
Memory
Required
per Block
Minimum
Size
Maximum
Size
Total Memory
Required for
Maximum Size
Default
Allocation
Total memory — — — 384 Kbytes — —
Ladder (L) 1 Kbyte 3 Kbytes 1 Kbyte 123 Kbytes 369 Kbytes 32 Kbytes
Variable (V) 1 Kbyte 1 Kbyte 1 Kbyte 369 Kbytes 369 Kbytes 52 Kbytes
Constant (K) 1 Kbyte 1 Kbyte 0 Kbytes 368 Kbytes 368 Kbytes 0 Kbytes
Special (S) 1 Kbyte 1 Kbyte 0 Kbytes 368 Kbytes 368 Kbytes 32 Kbytes
User (U) 1 Kbyte 1 Kbyte 0 Kbytes 368 Kbytes 368 Kbytes 0 Kbytes
Timer 1024
*
5 Kbytes 1024 20480 100 Kbytes 1024
Drum 64
*
3 Kbytes 64 2304 108 Kbytes 64
Shift Register 1024
*
1 Kbyte 1024 16384 16 Kbytes 1024
Table Move 1024
*
2 Kbytes 1024 14336 28 Kbytes 1024
One Shot 1024
*
1 Kbyte 1024 32768 32 Kbytes 1024
*
Number per block.
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