ProSoft Technology MVI69-HART - Manual (Page 103)

MVI69-HART ♦ CompactLogix Platform Reference
HART Multi-drop Master Communication Module User Manual
ProSoft Technology, Inc. Page 103 of 169
March 29, 2012
If the module is configured for multi-drop auto-polling (Auto-Poll Code = M), the
following diagram applies:
In multi-drop mode, the channel will poll for instruments 1 to the value set in the
MAX DEVICE COUNT parameter. For each device found, it will continuously poll
for data using command 3. After a certain number of iterations, the HART Driver
will ready the configuration data for the next device (if there is one). Each time
configuration information is acquired, it will be for a different slave device if more
than 1 slave is recognized by the channel. Less frequently, the channel will poll
for devices not found in the original search of the network using HART command
0. If communications is lost with all devices, the module will try to establish
communications with the devices using command 0. If user commands are
present and enabled, they will be executed after the data polling of the devices.