Emerson Rosemount 644 Reference Manual page 69

Reference Manual
00809-0200-4728
3.4.4 Multichannel installations
In a HART
supply, as shown in
negative power supply terminal. In multichannel installations where several transmitters
depend on one power supply and the loss of all transmitters would cause operational
problems, consider an uninterrupted power supply or a back-up battery. The diodes
shown in
Figure 3-6: Multichannel Installations
Between 250 Ω and 1100 Ω if no load resistor.
A. Transmitter no. 1
B. Transmitter no. 2
C. R
D. Readout or controller no. 1
E. Readout or controller no. 2
F. Backup battery
G. To additional transmitters
H. DC power supply
Emerson.com/Rosemount
®
installation, several transmitters can be connected to a single master power
Figure 3-6. In this case, the system may be grounded only at the
Figure 3-6 prevent unwanted charging or discharging of the back-up battery.
C
A
B
Lead
Hardware Installation
F
D
E
G
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H
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