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16-bit data elements, each box therefore represents two bytes of input or output data.

The command register array locations are numbered 0-7, and traverse from left to right. The status 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 received from or sent to the controller. A value of 0 indicates that no register is referenced at that location, which will cause corresponding command data to be ignored and status data to be a default value of 0.

As an example, looking at the default configuration shown in Figure 19, 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 module currently selected by the controller may require larger input and/or output data sizes, but all unreferenced command data will be ignored, and all unreferenced status data will contain dummy “0” values). The first word (two bytes) of command 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 status data will contain the value of register 1402 (status 1) and the second word will contain the value of register 1401 (output frequency).

10.5.4 Submitting Changes

Whenever any of the PROFINET configuration elements (I/O array configuration, Device Name, etc.) have been changed, the “submit” button located in the lower left- hand portion of the web page must be clicked in order to write these settings to the interface card’s filesystem.

Note that because these configuration elements are read from the filesystem only when the interface card boots up, the act of submitting configuration changes will also reset the interface

card. Please allow 30 seconds for the

interface card to reboot, at which time Figure 20: Submit PROFINET Changes it will then be operating with the

recently-submitted configuration. Refer to Figure 20.

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