Spectrum Controls 1769sc-HART Modules - Manual (Page 70)

Compact IO™ Isolated HART Analog Output Module
User’s Manual 0300217-03 Rev. A
7-4
Figure 7-3 (Auto Acquisition Flow)
The data that is collected from the process described in Figure 7-4 (Auto Acquisition
Flow) is buffered to the module RAM memory. Since the amount of data returned from
the auto-acquisition process is extensive, the data is multiplexed into five separate
packets and for each individual channel. The multiplexed data can be read from a 40 byte
array which is located in the OF4IH0Input.HartData tag. The multiplexed data is
demultiplexed using ladder and stored in five different arrays which are structured using
packets zero through four. The packets are defined as “user defined data types” and can
be seen in Table 7-1 through Table 7-5.
Start
Channel
Switch
Initializ
ed for
HART?
Connect to field
device
Read device
codes
Read extended
status
Read ASCII
messages
Read PVU and
PVL
Read 4 dynamic
variables
Read slot variables
if enabled
No
Yes