Radioclock - Dcf77 Decoding - Mitsubishi Electric a2 Series Programming Manual

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2 Simple Application Controllers
3.6.4

RadioClock - DCF77 Decoding

The RadioClock function enables the reception of time information broadcasted by radio signal
on 77.5 kHz from Frankfurt Germany. Special hardware is required for this feature. Refer to the
Alpha 2 Hardware Manual for more information. After configuring the hardware, follow the
steps below to set the controller for DCF77 decoding:
1 ) From the TopMenu, scroll to "ClockSet" and press the "OK" key.
2 ) From the options that appear, scroll to "RadioClock" and press the "OK" key.
3 ) Only one option appears if RadioClock has not been activated. Scroll to "RadioClock"
and press the "OK" key.
4 ) From the options that appear, scroll to "DCF77" and press the "OK" key. At this point, if the
controller cannot detect a signal the message "No Signal!" will flash on the headline.
5 ) To select the correct analog input that carries the DCF77 time signal, scroll to "Input No."
and press the "OK" key. Initially "Input No." will not be visible, it only appears as an option
after the RadioClock function has been enabled.
6 ) Select the Analog Input number from I01 to I08 with the +,- keys and the "OK" key.
7 ) If necessary, adjust for the timezone difference between Frankfurt, Germany and the place
of installation. This amount is added to (subtracted from) the received time. To do this,
scroll to "TimeDiffer" and press the "OK" key.
8 ) Select the timezone difference in half hour increments using the +,- keys. Press "OK" to
enter the timezone difference.
9 ) It is possible to manually start and stop the decoding of the time information. Scroll to
"Manual" and press the "OK" key. Either "Start Act." or "Stop Act." will be displayed
depending on the state of the controller at the time.
Note:
The "Input No.", "TimeDiffer" and "Manual" selections will only be displayed when
"DCF77" has been enabled from the "RadioClock" menu.
The error message "No Signal!" will flash on the headline if the controller does not receive the
DCF77 signal when the input is setup for the RadioClock function. If there should be a signal in
the installation area, check the setup and hardware for faults.
When in STOP mode and "Start Act." is used to manually start DCF77 decoding, the user must
check the state of M10 (decoding active flag) 30 minutes after starting the decoding. If M10 is
off, DCF77 decoding finished without error. If M10 is still ON, there is a problem with either the
wiring or the availability of the signal in the location of use (e.g. antenna problems). The user
should check both possible causes.
System Menu 3
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