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Communication modules
6.6 CP52IO GDM interface module
6.6
CP52IO GDM interface module
6.6.1
Areas of application
GlobalDataMemory
GlobalDataMemory (GDM) enables data exchange between all 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 rack
with 21 slots.
Each rack that is coupled with GDM must be equipped with a CP52A0 access module.
These racks are interconnected with GDM by means of fiber-optic cables in a star topology.
Figure 6-12
134
Example of a GDM system with 5 racks that are coupled with FOCs
SIMATIC TDC hardware
System Manual, 12/2013, A5E01114865-07
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