User Manual

Compact IO™ Isolated HART Analog Input Module

U ser 's M a n u a l 0 300 21 5- 03 R ev. A

7-4

Figure 7-3 (Auto Acquisition Flow)

The data that is collected from the process described in Figure 7-3 (Auto Acquisition

Flow) is buffered to the module RAM memory. Since the amount of data returned from

the auto-acquisitio n pr ocess is extensive, the data is multiplexed into f ive sepa r a te

packets and for each individual channel. The multiplexed data can be read from a 40 byte

array which is located in the Lo cal:X:I .Har tData tag. The multiplexed da ta 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

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

if enabled

Yes