1761-6.5
Chapter
3
Operation
Modes of Use
The DeviceNet Interface has three primary features.
•
DeviceNet I/O
•
Explicit Messaging
•
Programming over DeviceNet network
DeviceNet I/O
The DNI is capable of being owned by a master on DeviceNet. This
functionality on DeviceNet is part of the I/O class of services, and allows a
master device to exclusively manage (own) another device’s (a different
node number) data and resources. This type of relationship is functionally
the same as a PLC with remote I/O. A PLC uses the remote I/O chassis as
distributed inputs and outputs. The master/slave relationship on DeviceNet
is exactly the same, except it is being done over DeviceNet.
The amount of data available between devices that implement I/O master/
slave services is determined by the design of each device, and is not a
function of DeviceNet.
The DNI on DeviceNet is capable of handling 32 I/O words of data with a
DeviceNet I/O master for DNI Series A (64 for DNI Series B). This is
broken up into two data images: the input image and the output image.
Important:
All input and output comments are referenced from the
perspective of the DeviceNet Master.
AB Parts
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