SMAR HI302, User Manual

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An Example of HI302 Usage
7.6
12. When on UPDATED, just proceed as if with any common parameter, in order to write
it in any parameter that accepts writing, as for example, MESSAGE. Note that the
BLK_EXEC_STATE parameter passes by three states: WRITING, OLD DATA and
UPDATED. In normal conditions, the block must always return to UPDATED, to
indicate that the data in the block are the same ones as the values in the HART
device.
13. After the device related to the HIRT block has been identified, it is also possible to
read and write on the specific variables, by using the HVT block. The HVT block must
also have both the MODE_BLK.TARGET and MODE_BLK.ACTUAL = AUTO
parameters. Then, just write on the HART TAG, in the DEV_TAG_SEL
(
DEV_TAG_SEL = LD301-1A ) parameter, to start reading the specific variables in the
HVT parameters. Refer to the allocation map from the HVT block to the device, so that
you can relate the HVT parameters to the variables on the HART device. The
allocation maps are shown in the Appendixes section.
14. If the written HART_TAG is correct and the same one read by the HIRT block, the
HVT block starts the update, by sending all the reading commands in the configuration
30, as programmed on the HIRT. See that the BLK_EXEC_STATE parameter
changes to UPDATING and then goes to UPDATED at the end of the process, which
lasts about 2 minutes. Moreover, it shows on the
HCD_DEVICE_INFO e
HCD_SLECTED parameters information about the selected configuration.
15. To make a writing, the process is the same as for the HIRT. The next figure shows
the HVT being updated.