Reference Manual
00809-0100-4793, Rev CA
August 2004
2-7
Rosemount 8742C
NOTE
The number of devices on a fieldbus segment is limited by the power supply
voltage, the resistance of the cable, and the amount of current drawn by
each device.
Transmitter Wiring
Connection
To make the transmitter communication wiring connection, remove the end
cover on the electronics housing. Connect the power leads to the positive (+)
and negative (–) fieldbus communication terminals. The communication
terminals are polarity insensitive: the polarity of the dc power leads does not
matter when connecting to the power terminals.
When wiring to screw terminals, crimped lugs are recommended. Tighten the
terminals to ensure adequate contact.
Both transmitter covers must be fully engaged to meet explosion proof
requirements. Do not remove the transmitter covers in an explosive
atmosphere when the transmitter is powered
(1)
.
Figure 2-4. Rosemount 8742C
Transmitter Field Wiring
(1)
Pending final approval.
8742-8742_01A
Integrated
Power
Conditioner
and Filter
Terminators
6234 ft (1900 m) max
(depending upon cable
Fieldbus
Segment
(S
pur)
(Trunk)
(The power supply,
filter, first terminator,
and configuration tool
are typically located
in the control room.)
*
Intrinsically safe installations may
allow fewer devices per I.S. barrier.
Power
Supply
F
OUNDATION
Fieldbus
Configuration
Tool
(Spur)
Devices 1 through 11*
Summary of Contents for 8700 Series
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