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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
it will then be operating with the
recently-submitted configuration. Refer to Figure 20.
Figure 20: Submit PROFINET Changes