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SI-DeviceNet User Guide
Issue Number: 2
7
Non cyclic data
7.1
Introduction
“Explicit data” is the non cyclic data channel on DeviceNet that provides access to any
parameter and DeviceNet object within SI-DeviceNet. As such, it is always enabled and
active on SI-DeviceNet. Object access using explicit data is controlled entirely by the
master controller program, and is not usually configured in any way when the DeviceNet
network mapping is defined.
7.2
Explicit parameter access
The Control Techniques object (Class 100 or 0x64) provides access to all drive
parameters, using the parameters as shown:
Class code:
100 (0x64)
Instance:
Menu
Attribute:
Parameter
Read Code:
14 (0x0E)
Get_Attribute_Single
Write Code:
16 (0x10)
Set_Attribute_Single
All supported pre-defined DeviceNet objects can also be accessed using explicit
messaging. Refer to the master controller documentation for full details about explicit
messaging, and how to implement explicit messaging within the particular master
controller.
When accessing drive parameters using the Control Techniques object, all parameters
must be treated as signed 32-bit parameters.
As non-cyclic data control is implemented entirely in the DeviceNet master controller, the
method used will depend entirely on the type of master controller used.
NOTE
Menu 0 parameters in the drive can be access using instance 200 (0xC8).
Multiple parameter access (using the Get_Atttribute_All service) is not supported by SI-
DeviceNet.
NOTE
NOTE
