Beginners’ manual Series xx7│Document 26/835; Version E 2│22.04.2005
Saia-Burgess
Controls AG
Confi guring the CPU
Configuring I/O modules with the I/O Builder
3-4
3
Memory/compiler tab
On the Memory/compiler tab, you can set the size of the STEP
®
7 user memory. You
also have the option of setting the priorities of the components to be compiled.
Memory
In most Series xx7 controllers, the STEP
®
7 user memory is scalable. On this tab, the
memory can be configured in 64kB steps.
The maximum memory size for the various controllers is shown in the table below:
PCD type
S7 code memory size
PCD1.M137
Default: 64 kB.
Configurable to 64 kB or 128 kB.
PCD2.M127
Fixed 132 kB
PCD2.Mx57
Default: 256 kB.
Configurable from 64 kB to 512 kB.
PCD2.M177
Default: 512 kB.
Configurable from 64 kB to 1024 kB.
PCD2.M487
Default:
1024 kB.
Configurable from 64 kB to 1024 kB.
PCD3.M5547
Default:
512 kB.
Configurable from 64 kB to 512 kB.
PCD3.M5447
Default:
512 kB.
Configurable from 64 kB to 512 kB.
On the PCD2.Mx57 and PCD2.M177 controllers, the whole user memory is split
into S7 code memory and compiler memory. When allocating S7 code memory, it is
important to note how much memory is left for the compiler code. The smaller the S7
code memory, the larger the compiler memory.
