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Reference Manual
IP2030/RM, Rev AA
Section 4: Getting started
June 2014
Section 4: Getting started50
4.5.9 Programming Channel 2 for a HART input (MCU902 only)
(advanced users)
This section explains how to program (configure) the operation of the Input Channel 2 on the
control unit when a HART transmitter is connected. Read this section together with the
graphical overview in Figure 4-18 on page 47.
Note
Parameters from the HART transmitter are available on the control unit from the SETUP
and MONITOR menus, selectable from the main menu.
Essential parameter to program
Set Input Channel 2 to receive HART digital data from a transmitter
1. Navigate to:
SETUP / [CONTROLLER /] INPUT CHANNEL / [CHANNEL 2 /] Ch2 I/P Source
for the Ch2 I/P Source parameter P121.
2. Select Tx2: PV from the option list.
Note
The built-in Application (App) Wizard is an easy-to-use configuration tool that can be
used to automatically populate values and settings in the input channel parameters.
Navigate to: SETUP / [CONTROLLER /] APPLICATION / App Wizard
Before using the App Wizard, the Input Channel 2 parameter P121 on the control unit
must be set for a HART input. This is the factory default setting for P121.
Optional parameters and how the HART data is processed
Figure 4-18 on page 47 shows how the HART data is processed through Input Channel 2 and
shows which parameters and processing stages affect the result from Input Channel 2.
HART digital data is continuously read from the transmitter
The HART transmitter digitally communicates pre-calculated values of four HART variables
Primary Variable (PV), Secondary Variable (SV), Tertiary Variable (TV), and Fourth Variable (FV)
to the MCU900 Series control unit.
Selection of a HART variable as source for further processing
Parameter P121 selects one of the four HART variables (PV, SV, TV, or FV) on the transmitter to
be the source for further processing to get a result from Input Channel 2. The un-selected HART
variables are mapped to control unit D80x parameters.
Note
In Figure 4-18 on page 47, the selected source is the HART Primary Variable (PV).
Alternatively, Tx2: SV, Tx2: TV, or Tx2: FV could have been selected.
Read-only parameters D80* are in the menu MONITOR / READINGS