Coupling memory module
Hardware - SIMADYN D 4-3
Edition 03.2001
4
4.1.1 Real-time clock in the MM3 coupling memory module
The MM3 coupling memory module includes, in addition to the buffer
function, also a real-time clock, which can be set and synchronized via a
• DCF-77 radio signal
An additional dual port RAM connected to the L bus provides the clock time
to other functions in the CPU modules (e. g. message system). To realize
this, the MM3 must be configured as real-time source on the 1st CPU
module with function block RTCM.
The clock time (time of day) is buffered by the subrack back-up battery.
An MM3 can be inserted, together with an MM4 in a SIMADYN D subrack
to use the large MM4 memory, and to utilize the buffered real-time clock of
the MM3. In this case, the MM3 can be inserted at any subrack slot. The
MM3 memory is not used.
• 10-digit, 7-segment displays H1 - H10 for
seconds, minutes, hours, months, days
located under one another in pairs
(from top to bottom)
• 2 keys to manually set the clock
• 4 LEDs for status displays
• Screw/plug-in terminal (X5) for system error signal relay:
When a CPU module identifies a fatal error, normal operation is aborted;
the subrack goes into the STOP condition,
the relay opens when an error occurs
• Screw/plug-in terminal (X6) is prepared for IRIG-B audio signal;
this functionality has still not been implemented!
• BNC socket (X7) for DCF-77 antenna connection
• 1 double test socket for the reset signal (X10/X11) to reset the module
(caution: This must only be used for test purposes!)
Data back-up
MM3 + MM4
Front panel
elements
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