Mitsubishi MELSEC Q Series Reference Manual page 227

Numerical values in
relevant range
Numerical values
for 4 bits
Numerical values in
relevant range
Numerical values
for 4 bits
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3 WHEN COMMUNICATING USING THE QnA COMPATIBLE 3E/3C/4C FRAMES OR 4E FRAME
(g) Time of last updating and date of last updating
This data section indicates the date and time when the current data was
registered.
1) Data communication in ASCII code
The value shown below is converted to a 4-digit (hexadecimal) ASCII
code and sequentially transmitted beginning from the most significant
digit (time, year).
"0000" is transmitted when dummy data is designated.
2) Data communication in binary code
The 2-byte values shown below are sequentially transmitted beginning
from the low byte (L: bits 0 to 7).
0000 is transmitted when dummy data is designated.
H
3) The contents of the values that indicate the time and date and the
order in which they are transmitted are shown below.
• Time (hour, minute, second)
(Example)
20 hours 50 minutes 58 seconds
(Hours) (Minutes) (Second)
b15 – – – b11 b10 – – – – b5 b4
1 0 1 0 0 1 1 0 0 1 0 1 1 1 0 1
14 (20) 32 (50) 1D
...
H H
... A 6 5
H H H
Data during communication in binary code: A65D
Converted data during communication in ASCII code: "A65D" (sequentially transmitted beginning from "A")
• Data (Year, month, day)
(Example)
September 1, 1999
(Year) (Month)
b15 b9 b8 – –
– – – – –
0 0 1 0 0 1 1 1 0 0 1 0 0 0 0 1
...
13 (19) 9 (9)
H H
...
2 7 2
H H
Data during communication in binary code: 2721
Converted data during communication in ASCII code: "2721" (sequentially transmitted beginning from "2")
– – – b0
Seconds (the binary value divided by 2 is expressed in bits 0 to 4 bits)
...
Minutes (the binary value is expressed in bits 5 to 10)
Hours (the binary values is expressed in bits 11 to 15)
(29)
H
This shows 58/2 = 29
D
H
(transmitted in the order of 5D
H
(Day)
Day (the binary value is expressed in bits 0 to 4)
b5 b4 b0
– – –
Month (the binary value is expressed in bits 5 to 8)
...
Year the binary values is expressed in bits 9 to 15
by setting 1980 to 0.
1 (1)
H
This shows 19+1980 = 1999
1
H H
(transmitted in the order of 21
H
and then A6 )
H H
and then 27 )
H H
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