Coupling Memory Modules Mm11, Mm3, Mm4 - Siemens SIMADYN D Hardware Manual

Coupling memory module
4.1

Coupling memory modules MM11, MM3, MM4

Order No.
Application
Slot
Features
4-2
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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.
Coupling
1st CPU memory
module module
MM11
Bus connection L bus,
C bus
Memory size 2 * 64 Kbytes
Other functions
• 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
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2nd CPU nth CPU
module module
MM3 MM4
L bus, L bus,
C bus C bus
2 * 64 Kbytes 2 * 2 Mbytes
• System error-relay;
System error-
relay;
•
Radio clock
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Bus system
Hardware - SIMADYN D
Edition 03.2001
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