ABB 266 - Appendix A - Device Data Block; Device Application Process (DAP) Block; Resource Block (RB)

2600T Series Pressure transmitters | OI/266/FF/ADD-EN Rev. B 3
Appendix A – Device Data Blocks
The device parameters are listed in the following tables. You can access the parameters by means of the index number.
The individual blocks each contain standard parameters, block parameters and manufacturer-specific parameters. If you use the DD
based configuration tools as an operating program, input screens are available as a user interface.
General explanatory remarks
Object Type
Object type for the parameter value.
S – Simple variable.
R – Record.
A – Array of simple variables
Data Type – Data type for the parameter value.
Name – Simple variable or array.
DS-n – Data structure (Record) of index n.
Storage Class – Class of memory required
S – Static. Writing to the parameter changes the static revision counter ST_REV.
N – Non-volatile parameter which must be remembered through a power cycle, but which is not under the static update code.
D – Dynamic. The value is calculated by the block, or read from another block.
Size – Number of octets.
Analogue variable format
The output of each AI block as well as many variables calculated and available from the different blocks of the transmitter is
composed of 5 bytes. The Variable is of 32 bit size in Floating Point format (4 bytes) plus a Status Byte (1 Byte).
Variable format - Floating Point Format IEEE-754
Byte n Byte n+1 Byte n+2 Byte n+3
Bit 7 Bit 6 Bit 7 Bit 6 Bit 7 Bit 7
S 2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
2
-1
2
-2
2
-3
2
-4
2
-5
2
-6
2
-7
2
-8
2
-9
2
-10
2
-11
2
-12
2
-13
2
-14
2
-15
2
-16
2
-17
2
-18
2
-19
2
-20
2
-21
2
-22
2
-23
EXPONENT MANTISSA MANTISSA MANTISSA
Example: 40 F0 00 00 (hex) = 0100 000 111 000 000 000 000 000 (binary)
Calculation: Value = (-1)
S
* 2
(Exponent – 127)
* (1 + Mantissa)
Value = (-1)
0
* 2
(129 – 127)
* (1 + 2
-1
+ 2
-2
+ 2
-3
)
Value = 1 * 4 * (1 + 0.5 + 0.25 + 0.125) = 7.5
Status
The Status byte is the fifth byte of any out value and represents the Quality of the variable. Each Transducer and Function Block
produces a specific set of Status Bytes.
Device Application Process (DAP) blocks
Resource Block (RB)
Overview
This block contains data that is specific to the hardware that is associated with the resource. All data is modelled as Contained, so
there are no links to this block. The data is not processed in the way that a function block processes data, so there is no function
schematic. This parameter set is intended to be the minimum required for the Function Block Application associated with the
resource in which it resides. Some parameters that could be in the set, like calibration data and ambient temperature, are more
appropriately part of their respective transducer blocks. The ITK_VER parameter identifies the version of the Interoperability Tester
used by the Fieldbus Foundation in certifying the device as interoperable.
Important
Refer to the specific Block in order to see which Status bytes it produces