
UM344-2 INSTALLATION
September 1995
FIGURE 4-3 Multi-Drop Network (Digital Mode)
250
See
Note 2
MXC
Hazardous
Location
Non-Hazardous
Location
Supply and
Return Barriers
Shown Above
See Note 5
See
Note 4
Notes:
1. The System Power Supply is shown separate from the host input device. In practice, it may be part
of the host input device. The host input device can either be a HART or non-HART signaling device,
a Primary Master or Secondary Master.
2. Network resistance equals the sum of the barrier resistances and the current sense resistor.
Minimum value 250 Ohms; maximum value 1100 Ohms.
3. A maximum of 15 transmitters may be connected. All must be configured for digital mode.
4. Connect the MXC (a Secondary Master) to the loop only in the non-hazardous location. The MXC is
a non-polar device.
5. Interconnect all cable shields and ground only at the power source.
6. For access to Model 344 terminals, remove enclosure end cap.
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_
+
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System Power
Supply
Network
Primary
Master,
See Note 1
See Notes 3 and 6
+
_
+
_
Signal Test
X02868S1
Model 344
Terminal
+
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+
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Signal
Test
Model 344
Terminal
+
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+
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Signal
Test
Model 344
Terminal
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