Coupling memory module
4-2 Hardware - SIMADYN D
Edition 03.2001
4.1 Coupling memory modules MM11, MM3, MM4
MM11: 6DD1611-0AD0
MM3: 6DD1611-0AF0
MM4: 6DD1611-0AG0
A coupling memory module has a data memory (RAM), which is used to
transfer data via the CPU modules. A coupling memory module must always
be used if there is more than one CPU module in a subrack, and if the CPU
modules wish to transfer data within the module. For instance, using
configured „$ connections“, „coupling memory module coupling“ or if several
CPU modules access a CS7 serial interface.
A coupling memory module can be inserted at any slot between the first and
second CPU module.
1st CPU
module
Coupling
memory
module
2nd CPU
module
nth CPU
module
Bus system
MM11 MM3 MM4
Bus connection L bus,
C bus
L bus,
C bus
L bus,
C bus
Memory size 2 * 64 Kbytes 2 * 64 Kbytes 2 * 2 Mbytes
Other functions
• System error-
relay;
• Radio clock
System error-relay;
• Data is buffered against power failure using a back-up battery (3.4 V) in
the subrack
• Integrated bus termination for the C bus and L bus
Order No.
Application
Slot
Features
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