188 Rockwell Automation Publication 1789-UM002K-EN-P - January 2015
Appendix A Communicate with Devices on a DeviceNet Network
DeviceNet I/O Data
I/O information is presented as a structure of multiple fields that depend on the
specific features of the I/O module. The name of the structure is based on the
location of the I/O module in the system. Each I/O tag is automatically created
when you configure the I/O module through the programming software. Each
tag name follows this format:
Location:SlotNumber:Type.MemberName.SubMemberName.Bit
Tag Name Description
Location Identifies network location.
LOCAL = identifies communication card within the computer.
SlotNumber Slot number of I/O module in its chassis.
Type Type of data:
I = input
O = output
C = configuration
S = status
MemberName Specific data from the I/O module; depends on the type of data the module can store.
For example, Data and Fault are possible fields of data for an I/O module. Data is the common name for values that are sent to or received from I/O points.
SubMemberName Specific data related to a MemberName.
Bit (optional) Specific point on the I/O module; depends on the size of the I/O module (0…31 for a 32-point module).
The 1784-PCIDS card in this example is slot 3.
ATTENTION: The data for a 1784-PCIDS card is always configured as a rack-optimized connection.
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