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Installation, Operation and Maintenance Manual

MDE 254 Rev. 1 March 2021

HART Protocol Previews 9

Section 5: HART Protocol Previews

• MULTIDROP

The Multidrop Mode requires only a single pair of wires and can control up to 16 devices

connected in parallel. All process values are transmitted digitally. In Multidrop mode, each

field device must have a unique polling address, different from each other in the range

0 - 15. The current of the loop is fixed to a minimum value (typically 4 mA).

Figure 6

To work in Multidrop Mode the ICON HRT2000v4 module need to set SW5 pin 1 and 2 ON, pin 3 and

4 OFF. It needs also to place a 250 Ohm resistance between the terminals HART+ and HART- of the

last actuator to close the 4 - 20 mA current loop.

Alternatively, only in the last actuator of 4 - 20 mA current loop, set SW5 pin 1 and 2 OFF, pin 3 and 4

ON. In this case, it is not necessary to add the 250 Ohm resistance to close the 4 - 20 mA loop.

The other actuators of the loop must have SW5 pin 1 and 2 ON and pin 3 and 4 OFF.

See also Sections 8 (Universal command 6 and Device variable 3) and 11 for the configuration of

Mode (Loop enable or Multidrop) and Polling Address.

ICON3000

MAINS

HART

Interface

4 mA

250 Ohm

BIFFI ICON3000 User Manual

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