Spectrum Controls 1756sc-OF8H Series A - Manual (Page 86)

72 ControlLogix ™ Analog HART Modules
Figure 7.5 (Auto Acquisition Flow)
Start
Channel
Switch
Initialized
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
(OF8H Only)
NO
YES
The data that is collected from the process described in figure 7.5 is
buffered to the modules RAM memory. Since the amount of data
returned from the auto-acquisition process is extensive, utilizing the module
input tags efficiently would not be practical unless the data is multiplexed.
Therefore, the data is multiplexed into five separate packets and for each
individual channel. The packets are defined in tables 7.1 to 7.5.