
Starting Up the System
8-7
SIMATIC 545/555/575 System Manual
Table 8-6 555–1106 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 — — — 1856 Kbytes — —
Ladder (L) 1 Kbyte 3 Kbytes 1 Kbyte 614 Kbytes 1842 Kbytes 32 Kbytes
Variable (V) 1 Kbyte 1 Kbyte 1 Kbyte 1841 Kbytes 1841 Kbytes 52 Kbytes
Constant (K) 1 Kbyte 1 Kbyte 0 Kbytes 1840 Kbytes 1840 Kbytes 0 Kbytes
Special (S) 1 Kbyte 1 Kbyte 0 Kbytes 1840 Kbytes 1840 Kbytes 32 Kbytes
Compiled
Special (CS)
1 Kbyte 1 Kbyte 0 Kbytes 1840 Kbytes 1840 Kbytes 0 Kbytes
User (U) 1 Kbyte 1 Kbyte 0 Kbytes 1840 Kbytes 1840 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 8-7 575–2104 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 — — — 832 Kbytes — —
Ladder (L) 1 Kbyte 3 Kbytes 1 Kbyte 273 Kbytes 819 Kbytes 64 Kbytes
Variable (V) 1 Kbyte 1 Kbyte 1 Kbyte 817 Kbytes 817 Kbytes 52 Kbytes
Constant (K) 1 Kbyte 1 Kbyte 0 Kbytes 816 Kbytes 816 Kbytes 0 Kbytes
Special (S) 1 Kbyte 1 Kbyte 0 Kbytes 816 Kbytes 816 Kbytes 32 Kbytes
User (U) 1 Kbyte 1 Kbyte 0 Kbytes 816 Kbytes 816 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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