FB3000 RTU Instruction Manual
D301851X012
November 2023
I/O Configuration and Wiring 61
Figure 3-10 shows how to wire all four HART channels in point-to-point mode. In this case,
each HART channel only communicates to a single HART device. You choose whether a
given channel serves as an input or output in FBxConnect. The 24V internal loop power
supply powers the HART devices. The HART interface only sinks current, it cannot source
current. As an output, each channel simultaneously provides an analog current signal
output (sink current only at 4-20 mA) and a HART signal modulated on top of it.
Figure 3-10. HART Wiring – Point-to-Point Mode
Fig
ure 3-11 shows how to wire a HART channel for devices which do not use loop power
but get power from an external power supply.
Figure 3-11. HART Wiring – Point-to-Point Mode – External Power Supply
External 24V Power Supply
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