74BConnection Object 7BChapter Four: Operation
60
Connection Object
The Connection Object (Class Code 05
hex
) contains the attributes for defining the messaging
connections in the device. Each connection is defined by the type of messaging (explicit or I/O) it
supports and how the I/O connections publish attribute data. Your transducer supports explicit
and I/O poll messaging as defined in the Predefined Master/Slave Connection Set [1]. Examples
of explicit and I/O poll messages are described in Appendix D: Example Messages, page 111.
Two instances of the Connection Object (Table 28) are supported with 15 instance attributes
(Table 29, page 61, and Table 30, page 62) and three DeviceNet common services (Table 34,
page 64).
Note
1. The type of connection (explicit or I/O) is defined by the
Allocate_Master_Slave service in the DeviceNet Object. (Refer to Allocate
Master/Slave, page 107, for more information.)
2. The ty
pe of message is defined by the m
essage identifier. (Refer to CAN
Identifier Field, page 47.) When the Allocate_Master_Slave service is issued,
the attribute data is automatically
sent in the format defined by the Predefined
Master/Slave Connection Set.
Connection Object Instances
Table 28: Connection Object Instances
Instance ID # (hex) Description
1 Explicit Messaging
2 I/O Poll Messaging
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