Rosemount 3491 - Transmitter Inputs; To the 3490

Reference Manual
00809-0100-4841, Rev. AA
May 2007
Rosemount 3490 Series
4-12
Transmitter inputs
to the 3490
This section explains the operation of the 3490’s input channels.
NOTE:
If using the "Duty" wizard to set-up the 3490 Series Control Unit, the wizard
will automatically calculate and populate all necessary parameters of the input
channels, and so you proceed to the Section “Digital Inputs IN1 and IN2“ on
page 4-34.
On this page, follow the guidance for the particular model of the 3490 Series
Control Unit that you have e.g. model 3491. You will be directed to the
sections that are appropriate for your particular system.
NOTE:
If you want to edit or view parameters (e.g. Bottom Reference) of a
Rosemount 3100 Series transmitter, it is recommended you refer to the
transmitter manual. See also “Health Check: Rosemount 3102/3105 Series
transmitters“ on page 5-8 and Appendix C of this manual.
Models 3491 or 3493
If you have model 3491 or model 3493, there is support for one transmitter
connection. Consequently, there is one input channel named
Input Channel 1.
In Table 4-1, identify the type of transmitter connected and refer to the
corresponding sections.
Table 4-1. Transmitter options
for models 3491 and 3493
Model 3492
If you have model 3492, there is support for two HART transmitters, but not
two 4-20mA transmitters. Consequently, there are two channels and they are
named Input Channel 1 and Input Channel 2.
Table 4-2. Transmitter options
for model 3492
Transmitter 1 Instructions
4-20mA "Set-up Input Channel 1 as guided on page 4-14.
HART "Set-up Input Channel 1 as guided on page 4-20
Transmitter 1 Transmitter 2 Instructions
4-20mA (Not allowed) Set-up Input Channel 1 using Section “Setting up Input
Channel 1 for a 4-20mA input“ on page 4-14
HART HART Set-up Channels 1-2 using Sections “Setting up Input
Channel 1 for a HART input“ on page 4-20.and
“Setting up Channel 2 for a HART input (Model 3492
only)“ on page 4-22