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10. Appendix D: DeviceNet Objects
The “Change-of-State / Cyclic Connection” connection (Instance ID 16#04) allows the gateway to produce its
data only when their values change or when a timer called “heartbeat rate” times out. A minimum time limit is
intended to prevent the connection from monopolizing the DeviceNet network’s bandwidth, should the values of
the data it produces change too often. Going into “Cyclic” mode allows the number of exchanges made via this
connection to be reduced if the update time (sampling) for the data produced is slow. By adjusting the
connection’s cycle time to the value of this time, the produced data corresponds exactly to the data samples,
without losing or repeating any sample.
Attributes of class 16#05
ID Access Name Need Type Value Description
16#01 Get Revision Optional UINT 1 Revision index of the “Connection Object” class.
16#64 Get / Set Polled production Optional USINT 0 Index of the input area used by the gateway for
production on its “Polled Command/Response”
connection. (1)
16#65 Get / Set Polled consumption Optional USINT 0 Index of the output area used by the gateway for
consumption on its “Polled Command/Response”
connection. (1)
16#66 Get / Set Strobed production Optional USINT 0 Index of the input area used by the gateway for
production on its “Bit Strobed Command/Response”
connection. (1)
16#67 Get / Set Strobed consumption Optional USINT 0 Index of the output area used by the gateway for
consumption on its “Bit Strobed Command/Response”
connection. (1)
16#68 Get / Set COS production Optional USINT 0
Index of the input area used by the gateway for
production on its “Bit Strobed Command/Response”
connection. (1)
(1) All these 5 attributes relate to the first 5 parameters referenced by the EDS file supplied with the gateway.
Write access to them (Access = Set) is reserved for DeviceNet configuration tools. You should not use the
“Set_Attribute_Single” service with these attributes. An area’s index is necessarily equal to 0 and
corresponds to the “Input1” area of the gateway, that is to say to its only one input data area.
Services in class 16#05
Service code Name of the service Need Description
16#0E Get_Attribute_Single Required This service allows to read the value of one of the class
attributes.
Attributes of instance 16#01 of class 16#05: Explicit Connection
ID Access Name Need Type Value
16#01 Get
State
Required USINT 0 to 5
This attribute represents the status of the “Explicit Connection” object. The LUFP9 gateway supports the
following values: 0 (non-existent), 1 (in the process of being configured), 3 (connection established), 4 (timed out)
and 5 (deferred deletion). Please see figures 5.16 and 7.4 in volume I of the DeviceNet specifications for further
information on this subject.
16#02 Get
Instance type
Required USINT 0
This attribute defines the instance’s connection type: Messaging connection (0) or I/O connection (1).