Emerson 5400 Manuel D’Utilisation

00809-0500-4530, Rev AA
October 2010

1-9

Rosemount 5300/5400 Series

The HMC supports up to four external HART devices. The external devices 
are separated by using the HART address. The address must be different 
between the external devices and only addresses 1 to 5 are allowed for 
multiple slaves. Connect the devices one at a time and change the short 
address prior to connecting the next device by using a HART Configuration 
Tool such as RRM, or a Field Communicator.

NOTE
The power supply from the HMC to external HART devices is not intrinsically 
safe. In a hazardous environment, any external HART device connected to 
the HMC must have Flameproof/Explosion-proof certification.

The HMC cyclically polls the HART devices for measurement values. The 
update rate depends on the number of connected devices and is shown in 
Table 1-2.

Table 1-2.  Approximate update 
rates for measurement values

Figure 1-7. The HMC Module 
supports up to four external devices 
(slaves)

1

2 seconds

2

3 seconds

3

4 seconds

4

5 seconds

5

5 seconds

MODBUS

POWER

HART

(RS-485)

HART to Modbus Converter

MB

MA

Ambients > 60 ºC
Use wiring rated
for min 90 ºC