Mitsubishi Electric a Serie Manuel page 64

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2 Simple Application Controllers
8) Press the "OK" or "ESC" keys to preform an execute or cancel operation.
Note
*1 The
signal is not received and decoded.
10.4.3 Automatically Start
The DCF77 Radioclock decoding phase will start automatically if the following conditions are
satisfied:
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1) The 2 Real Time Clock (RTC) reaches 1.00am.
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2) The 2 Real Time Clock (RTC) will produce an error after Powering ON the controller.
10.4.4 Automatically Stop
The DCF77 Radioclock decoding phase will stop automatically if the following conditions are
satisfied:
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1) The 2 Real Time Clock (RTC) was configured correctly and a valid time was received
2) No valid time was received during 30 minutes of retries.
10.4.5 Verification of Received Time
The DCF77 Radioclock decoded time is checked for validity based on the following three
items:
1) Parity Check - The DCF77 time code data frame is protected by 3 (even) parity bits. The
first parity bit protects the minute data, the second protects the hour data and the third parity
bit protects the day, day of the week, month and year data.
2) Data Range Check -
a) 0< mintues<59
b) 0< hours<23
c) 1< days<31
d) 1< month<12
e) 0< year<59
3) Time Difference Check - The difference between two received time frames must equate to 1
minute, thus, the total time (in minutes from 1990/01/01) of every time frame is referenced.
Caution
• When "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. The user should check both possible causes.
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2 Controller will alternate between "No signal" and "Radioclock" if the DCF77
DCF77 Radio Clock 10
Ma n u a l
S t o p A c t .
OK o r E SC
ENG-52