Mitsubishi Electric MELSEC iQ-R - Page 292

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APPX
Appendix 7 Data Block Formats
Format for each PrimitiveDataType
PrimitiveDataType Offset Upper byte Lower byte Remarks
Null +2 to +3 Not used 
BOOLEAN +2 Only b0 is used. b1 to b15 should be 0.
+3 Not used 
Unsigned +2 b15 to b8 b7 to b0 
+3 b31 to b24 b23 to b16
Signed +2 b15 to b8 b7 to b0 
+3 b31 to b24 b23 to b16
REAL +2 b15 to b8 b7 to b0 
+3 b31 to b24 b23 to b16
Bitstring +2 b8 to b15 b0 to b7 The bit order is little endian.
+3 Number of significant
bits
b16 to b23
Enumerated +2 b15 to b8 b7 to b0 
+3 b31 to b24 b23 to b16
Date +2 Day Week • Day
1 to 31 (day)
• Week
1: Monday, 2: Tuesday, 3. Wednesday, 4: Thursday,
5: Friday, 6: Saturday, 7: Sunday
• (Year-1900)
Year (4 digits) -1900 (year)
• Month
1 to 12 (month)
+3 (Year-1900) Month
Time +2 Second Hundredth • Second
0 to 59 (s)
• Hundredth
0 to 99 (1/100 s)
• Hour
0 to 23 (h)
• Minute
0 to 59 (min)
+3 Hour Minute
ObjectIdentifier +2 b15 to b8 b7 to b0 
+3 b31 to b24 b23 to b16