Figure 36: EtherNet/IP Class 1 (I/O) Data
Configuration
ICC
configurable, and is utilized when the client opens a connection to the interface using assembly instances 100 and 150.
The user-configurable data arrays consist of two separate elements (refer to Figure 36.) The consumed register configuration defines the structure of the command data sent from the EtherNet/IP controller (for example, a ControlLogix PLC) to the drive, and the produced register configuration defines the structure of the status data sent from the drive back to the controller. These arrays allow the creation of custom-built I/O data. Up to 32 command registers can be sent to the drive, and up to 32 status registers can be sent back to the controller. Each box in an array is capable of containing a register number. Because all drive registers are 16-bit data elements,
each box therefore represents two bytes of consumed or produced data.
Each of the register array locations are numbered 0-31, and traverse from left to right across each row, and then increment to the left-most position on the next row. Clicking on a box in an array allows the user to enter a register number that will be referenced at that location when data is either consumed from the controller or produced to the network. A value of 0 indicates that no register is referenced at that location, which will cause the corresponding consumed data to be ignored and produced data to be a default value of 0.
As an example, looking at the default configuration shown in Figure 36, we can see that each array contains two defined registers. Therefore, up to 4 “meaningful” bytes of data can be both received and sent (the qualifier “meaningful” is used here because the connection sizes configured in the controller may request larger consumed and/or produced data sizes, but all unreferenced consumed data will be ignored, and all unreferenced produced data will contain dummy “0” values). The first word (two bytes) of consumed data will be written to register 1007 (command 1) and the second word will be written to register 1008 (frequency command). Similarly, the first word of produced data will contain the value of register 1402 (status 1) and the second word will contain the value of register 1401 (output frequency).
10.8.5 Submitting Changes
Whenever any of the EtherNet/IP configuration elements (Device Name or I/O array configurations) have been changed, the “submit” button located in the right-hand portion of the web page must be clicked in order to write these settings to the interface card’s filesystem.
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