7-4
Figure 7-4 HART Multidrop Wiring with SMART FAMILY
™
Transmitters and a Configuration Tool
7.4 Frequency Output Wiring
Frequency output wiring depends on whether you are wiring terminals 3 and 4 (Channel B) or
terminals 5 and 6 (Channel C), and also on whether you have configured the terminals for internal or
external power. The following diagrams are examples of proper wiring for these configurations:
•
Channel B, internal power – Figure 7-5
•
Channel B, external power – Figure 7-6
•
Channel C, internal power – Figure 7-7
•
Channel C, external power – Figure 7-8
Note: If both Channel B and Channel C are configured for frequency output, the Channel C signal is
generated from the Channel B signal, with a user-specified phase shift. The signals are electrically
isolated but not independent. This configuration is used to support dual-pulse and quadrature modes.
For more information, see the transmitter configuration manual.
HART-compatible
host or controller
HART-compatible
transmitters
SMART FAMILY
™
transmitters
Note: For optimum HART
communication, make sure the output
loop is single-point-grounded to an
instrument-grade ground.
24 VDC loop power
supply required for
HART 4–20 mA
passive transmitters
QTA FM CIO
transmitter (internally
powered outputs)
600
Ω
maximum resistance
250
Ω
minimum resistance
QTA FM CIO
transmitter (externally
powered outputs)
Instruction and Operation Manual
X-CM-QmBS-eng
Part Number: 541B052AHG
June, 2008
Section 7 I/O Wiring FM CIO Transmitter
QmBS Sensor / QTA Transmitters
