Emerson 5300, 5400 External Hart Devices Slaves, No. of devices Approx. update rate Slaves

Manual Supplement

00809-0500-4530, Rev AA October 2010

Rosemount 5300/5400 Series

External HART Devices (Slaves)

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

No. of devices	Approx. update rate
(slaves)
1	2 seconds
2	3 seconds
3	4 seconds
4	5 seconds
5	5 seconds

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

RS-485

Bus

Power Supply

Up to four external devices

HART to Modbus Converter

MB

MODBUS MA

(RS-485) -

- POWER +

	HART Ambients > 60 ºC
+	Use wiring rated
	for min 90 ºC

External HART	External HART
device 2	device 1

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