Appendix 7 Data Block Formats - Mitsubishi Electric MELSEC iQ-R User Manual

Appendix 7
Format of RDTB
The following shows the buffer memory format and the data range of RDTB.
Offset Description
+0 PrimitiveDataType
+1 PriorityArrayIndex
+2 to +3 Data
*1 When a value is written to the PresentValue property of an AnalogOutput object, BinaryOutput object, or MultistateOutput object, the
value is temporarily stored to the PriorityArray property whose index number is indicated by the Priority. The value stored to the
PriorityArray property, whose index number is the smallest, is used for the PresentValue property.
Until the value of the PriorityArray property whose index number is used as a PresentValue property is returned to Null, the value of the
PriorityArray property is used as the value of the PresentValue property.
*2 When any of the values from 1 to 16 is stored, a Priority is specified. When do not specify a Priority, store the value other than 1 to 16 ('0'
for example).
PrimitiveDataType
The properties of the following data types can be read/written.
Value Data type
0 Null
1 BOOLEAN
2 Unsigned
3 Signed
4 REAL
8 Bitstring
9 Enumerated
10 Date
11 Time
12 ObjectIdentifier
Data Block Formats
Remarks
Set the data type of a property value.
Page 289 PrimitiveDataType
Store the priority to write the PresentValue property value of the following objects within the range
*1
from 1 to 16.
• AnalogOutput object
• BinaryOutput object
• MultistateOutput object
Store property values in accordance with the format for each PrimitiveDataType.
Page 290 Format for each PrimitiveDataType
Data range
None
0: False, 1: True
Range: 0 to 4294967295
(32-bit unsigned integer)
Range: -2147483648 to 2147483647
(32-bit signed integer)
Within the range of 32-bit floating point real number
Minimum change value: 0.000001
Up to 24 bits
Range: 0 to 4294967295
(32-bit unsigned integer)


b31 to b22: Object type number (range: 0 to 1023)
b21 to b0: Instance number (range: 0 to 4194303)
Data range
0h to Ch
0h to FFFFh

APPX

Appendix 7 Data Block Formats

*2
A
289