User guide

7 DESCRIPTION OF HART INTERFACE
36
SMARTSENS PH 8570
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7.4 Inputs/outputs and HART
®
dynamic variables and device variables
Code = device variable code
Device variables
The HART
®
dynamic variable PV is always connected to the HART
®
current output which is
assigned to the pH value.
7.5 Field Communicator 475 (FC 475)
The Field Communicator is a hand terminal from Emerson Process Management that is
designed to configure HART
®
and Foundation Fieldbus devices. Device Descriptions (DDs) are
used to integrate different devices into the Field Communicator.
7.5.1 Installation
The HART
®
Device Description for the sensor must be installed on the Field Communicator.
Otherwise only the functions of a generic DD are available to the user and the entire device
control is not possible. A "Field Communicator Easy Upgrade Programming Utility" is required to
install the DDs on the Field Communicator.
The Field Communicator must be equipped with a system card with "Easy Upgrade Option". For
details consult the Field Communicator User’s Manual.
HART
®
dynamic variable
PV SV TV QV
pH Electrode voltage Temperature Resistance
HART
®
device variable
Code Type
pH value 0 linear
Electrode voltage 1 linear
Temperature 2 linear
Resistance 3 linear
.book Page 36 Monday, November 18, 2013 4:44 PM