Communication modules
6.5 CP52A0 GDM access module
SIMATIC TDC hardware
156 System Manual, 08/2017, A5E01114865-AL
CP52A0 GDM access module
6.5.1
Areas of application
GlobalDataMemory
G
lobal
ata
emory (
) enables data exchange between
CPU modules in all racks of
the system.
Since central memory supports the synchronous coupling of up to 44 racks, it is possible to
operate up to 836 CPU modules in a maximum system configuration.
A separate rack is used for GDM. The CP52M0 memory module (slot 1) and an appropriate
number of CP52IO interface modules (slots 2-12) are accommodated in the UR5213 or
UR6021 racks with 21 slots.
Each rack that is coupled with GDM must contain a
. These racks
are interconnected with GDM by means of fiber-optic cables in a star topology.
Figure 6-12 Example of a GDM system with 5 racks that are coupled with FOCs
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