Rosemount 781 Operating Manual
Quick Start Guide
00825-0100-4421, Rev CB
Emerson™ Smart Wireless Field Link
June 2017
Quick Start Guide
June 2017
NOTICE
This guide provides basic guidelines for the Smar t Wireless Field Link. It does not provide instructions for
diagnostics, maintenance, service, or troubleshooting. This guide is also available electro nically on
www.emersonprocess.com.
Failure to follow these installation guidelines could result in death or serious injury.
Make sure only qualified personnel perform the installation.
Explosions could result in death or serious injury.
Installation of this transmitter in an explosive environment must be in accordance with the appropriate
local, national, and international standards, codes, and practices. Review the Product Certifications
section for any restrictions associated with a safe installation.
Electrical shock can result in death or serious injury.
Avoid contact with the leads and terminals. High voltage may be present on leads can cause electrical
shock.
This device complies with Part 15 of the FCC Rules. Operation is subject to the following conditions:
This device may not cause harmful interference.
This devi ce must accept any interferen ce received, including interference that may cause undesired
operation.
This device must be installed to ensure a minimum antenna separation distance of 8-in. (20 cm) from all
persons.
Contents
Wireless considerations . . . . . . . . . . . . . . . . . . . 3
Physical installation . . . . . . . . . . . . . . . . . . . . . . . 5
Verif y operation . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2
Reference information . . . . . . . . . . . . . . . . . . 7
Ordering information . . . . . . . . . . . . . . . . . . . . . 9
Product Certifications . . . . . . . . . . . . . . . . . . . . 10
June 2017
A
B
C
D
E
15- to 25-ft.
(4,6 to 7,6 m)
6-ft. (2 m)
Quick Start Guide
1.0 Wireless considerations
1.1 Power up sequence
The Smart™ Wireless Field Link and wireless I/O should be installed and
functioning properly before the power modules are installed in any wireless field
devices. Wireless field devices should also be powered up in order of proximity
from the Field Link beginning with the closest. This will result in a simpler and
faster network installation.
1.2 Mounting location
The Field Link should be mounted in a location that allows convenient access to
the host system network (wireless I/O) as well as the wireless field device
network.
Find a location where the Field Link has optimal wireless performance. Ideally this
will be 15 to 25 ft. (4,6 to 7,6 m) above the ground or 6 ft. (2 m) above
obstructions or major infrastructure.
Figure 1. Mounting Location
A. Control room
B. Ground
C. Field link
D. Mast or pipe
E. Infrastructure
3
Quick Start Guide
A
A
1.3 Antenna position
The antenna should be positioned vertically, either straight up or straight down,
and should be approximately 3 ft. (1 m) from any large structure, building, or
conductive surface to allow for clear communication to other devices.
Figure 2. Antenna Position
1.4 Conduit plug
The temporary orange plugs should be replaced with the included conduit plugs
using approved thread sealant.
June 2017
Figure 3. Conduit Plugs
A. Conduit plug
4
June 2017
Quick Start Guide
1.5 Intended use
The Field Link must be used in conjunction with a network manager or network
Gateway. The Field Link then functions as a translator between the wired network
and a wireless field network.
Figure 4. Example System Architecture
A
E
B
D
C
F
A. Host system
B. Control network
C. Network manager
D. Field link
E. Wireless field network
F. Wireless field devices
2.0 Physical installation
2.1 Pipe mounting
1. Insert larger U-bolt around 2 in. pipe/mast, through the saddle, through the
L-shaped bracket, and through the washer plate.
1
2. Use a
3. Insert smaller U-bolt around base the Field Link and through the L-shaped
4. Use a
Figure 5. Mounting
/2-in. socket-head wrench to fasten the nuts to the U-bolt.
bracket.
1
/2-in. socket-head wrench to fasten the nuts to the U-bolt.
5
Quick Start Guide
2.2 Power and data wiring
1. Remove housing cover labeled “Field Terminals.”
2. Connect the positive power lead to the “+” power terminal and the negative
power lead to the “–” terminal.
3. Connect the Data + lead to the “A (+)” terminal and the Data – lead to the “B
(–)” terminal.
4. Plug and seal any unused conduit connections.
5. Replace the housing cover.
Figure 6. Smart Wireless Field Link Terminal Diagram
A
A. Data A (+)
B. Data B (
B
C. +10.5 to 30 VDC
–)
D. Return
D
C
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2.3 Grounding
The Field Link enclosure should always be grounded in accordance with national
and local electrical codes. The most effective grounding method is a direct
connection to earth ground with minimal impedance. Ground the Field Link by
connecting the external ground lug to earth ground. The connection should be
1 Ω or less.
3.0 Verify operation
3.1 Power-up sequence
Upon applying power to the Field link the LCD display meter will activate and
display a series of startup screen. The following screens are displayed during
startup.
1. Startup Screen 1 – All segments on
2. Startup Screen 2 – Device Identification
3. Startup Screen 3 – Tag
4. Startup Screen 4 – Status
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