4BChapter One: General Information
50BIntroduction
19
Definitions
Table 5: Definitions
Term Description
Attribute
All elementary data types are defined in [1]
ARRAY
A listing or grouping of elements of the same data type
BOOL
Boolean, which can take either a 0 or 1 value
CAN
Control Area Network, which is a specification of physical layer
signaling and media access control in DeviceNet
Class Code
Definition of the Object Class toward which a request message is
directed, specified as either a 8-bit or 16-bit integer
Common Service
A service, defined in [2], that can be used in multiple objects—each
has a fixed set of parameters that are defined in [1]
DATE
Date information (
not the ODVA definition of DATE
)—a structure of
(1) a year of type UINT, (2) a month of type USINT, and (3) a day of
type USINT (Table 48, page 81)
Full Scale (FS) Range
Defined 100% value of an attribute in its assigned units
INT
Signed 16-bit integer value between -32,768 and +32, 767
Instance ID
Definition of a particular instance within an Object Class
LSB
Least Significant Bit
MSB
Most Significant Bit
Network Access
Definition of how an attribute can be accessed over the network:
R = Read Only; RW = Read/Write
ODVA
Open DeviceNet Vendors Association
REAL
32-bit floating point value conforming to IEEE 754 basic single
floating point format
Service Data
Carries “request specific” data
Service Type
R = Request; N = Notification; M = Mandatory
SINT
Signed 8-bit integer value
SHORT-STRING
ASCII character string with 1 byte per character—a 1 byte length
precedes the string
STRUCT
Contains more than one attribute type
UINT
Unsigned 16-bit integer value between 0 and 65,535
UDINT
Unsigned (double) 32-bit integer value
ULINT
Unsigned (long) 64-bit integer value
USINT
Unsigned 8-bit integer value between 0 and 255
WORD 16-bit
string
References
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