Emerson 1410H Quick Start Manual page 14

Quick Start Guide
4.2 Connecting the Emerson 1410H with 781 Field Links
There are two main connection configurations for the Emerson 1410H and
781 Field Links: with and without barriers. The location and hazardous
approval option of the Emerson 781s determine whether it needs to be
installed with barriers. This connection will have to be done for both networks.
4.3 Installation without barriers
A shielded twisted-pair cable is needed for connecting the Emerson 1410H
and 781 Field Links. Each Emerson 781 can be located up to 656 ft. (200m)
from the Emerson 1410H. This will need to be done twice for the two
networks.
Figure 4-2: Emerson 1410H and 781 Field Links without Barriers
Installation
A. Emerson Wireless 1410H Gateway
B. Attach shield pair cable (Belden 3084A or equivalent)
C. Tape back shield wire and foils
D. Short these terminal for a 250Ω terminating resistor
E. Emerson Wireless 781 Field Link
4.4 Installation with barriers
When installing the Emerson 781 in a hazardous area there are two I.S.
barriers that need to be installed: a power barrier and a signal barrier. The
signal and the power are two separate I.S. circuits so they must comply with
proper I.S. segregation distance. When using the Emerson recommended
barriers the individual input powers of the Gateway should be 20–30 VDC,
with current capacity of at least 330 mA per 781. If one power supply is used,
the current capacity needs to be at least 660 mA.
14
February 2019
Emerson.com/Rosemount