Installation and Operation Manual
X-DPT-DeviceNet-SLA5800-SLAMf-Series-RevB-PC-eng
Part Number: 541B200AAG
March, 2015
17
Section 4 - Configuration
Brooks DeviceNet PCs
4.1.3. Data Type
The Data Type of an attribute defines the way a data value is represented in
the PC and transmitted across the network, such as integer and floating
point. Most of the attributes defined in the PC have a static data type,
meaning that the data type for that attribute is defined once and never
changes.
Several of the key attributes in the PC have a dynamic data type that is
defined and configurable via a companion attribute. Pressure in the S-Analog
Sensor object (Pressure Sensor Parameter) has a companion attribute to
define pressure’s data type. Some other key attributes with dynamic data
type are Setpoint and Valve Position. It may be desirable when changing
Data Units (see Data Units section below) to change the Data Type also. For
example, if Pressure and Setpoint are configured to represent Data Units
“Percent”, then Data Type INT would limit the values to whole numbers from
0 to 100. Therefore, the smallest increment of pressure/setpoint would be 1.
However, if Data Type was set to REAL, Pressure/Setpoint could now be
floating point numbers between 0.00000 to 100.000.
The following table lists objects and their attributes associated with
configuring data type.
Table 4-3 Configurable Data Type Attributes
EDS Parameter
EPATH
Applicable Units Table
Out-of Box Default
Pressure Sensor Data Type
[0x31-1-3]
Appendix B - Data Type Definitions
INT
Valve Data Type
[0x32-1-3]
Appendix B - Data Type Definitions
INT
Pressure Control Data Type
[0x33-1-3]
Appendix B - Data Type Definitions
INT
NOTE:
The two data types supported by the SLA5800/SLAMf Series PC for the
dynamic data typed attributes are INT and REAL. An INT is a number that is
represented by whole numbers ranging from –32768 to 32767. A REAL is a
floating-point number ranging from 3.4E38 to -3.4E38.
