CP52M0 memory module

The 2 Mbyte central memory of the GDM system is located on the CP52M0 memory module. The complete data transfer and exchange between the processors in the coupled subracks is handled by this 2 Mbyte memory.

Data is exchanged between the CP52IO interface modules and the memory module along the backplane bus.

The CP52M0 reads-out from the fault and diagnostic registers of the CP52IO inserted in the GDM subrack at all of the fiber-optic cable interfaces. It centrally detects the operating status of all of the fiber-optic cable interfaces. The result is output at the digital outputs of the CP52M0 where the data can be further evaluated.

CP52IO interface module

The GDM access modules CP52A0 in the coupled subracks are connected to the GlobalDataMemory interface module CP52IO through fiber-optic cables. Up to 4 subracks can be connected to each CP52IO.

CP52A0 access module

The CP52A0 access module is configured in every subrack which is connected to the GDM.

Mixed operation

The CP52M0 and CP52IO GDM modules are operated in a special mode which is especially fast. It is not possible to use the GDM modules together with other SIMATIC TDC modules.

Fiber-optic cable

A duplex glass fiber-optic cable (62.5/125 µm core diameter) is used to establish the connection between the CP52IO interface modules and the CP52A0 access module. The maximum cable length is 200 m. A duplex SC connector is used to make the connection.