Honeywell SEARCHLINE EXCEL PLUS Technical Manual

64 Chapter 10 Communications
Searchline Excel™ Plus / Searchline Excel™ Edge – Technical Manual
10 Communications
10.1HART®
General
Searchline Excel Plus & Searchline Excel Edge can communicate using the HART DTM protocol, which provides digital
communications superimposed on the standard analogue output. More information about the HART DTM protocol can be
found at the HART Communication Foundation’s website https://fieldcommgroup.org.
HART is a controller-responder protocol, i.e., Searchline Excel Plus & Searchline Excel Edge do not continually transmit data
but will respond on request.
Honeywell Analytics provides a HART Electronic Device Description (EDD) file for Searchline Excel Plus & Searchline Excel
Edge, which is available to download from https://sps.honeywell.com/us/en/software/safety/gas-detection-software-and-
firmware.
The EDD file is written using HART version 7, and is compatible with HART EDD Tokenizer versions 6 and 8.
The EDD file is supplied in .fm6, .fm8, .hhd and .hdd versions. It is compatible with a wide range of industry standard
products.
To use HART communications, load the EDD file into a suitable HART host (see manufacturer’s instructions).
Searchline Excel Plus & Searchline Excel Edge can be configured and operated by a Device Type Manager (DTM) that
provides an easy-to-use user interface for accessing device variables, configuration parameters and diagnosis information.
The Device Type Manager (DTM) offers the combination of FDT and EDDL technologies and a uniform user interface
according to the FDT style guide. It is a full-featured DTM device that carries the standard EDDInterpreter components
to execute the EDD during runtime. Because it is using existing device descriptions, plant operators will experience
a familiar operating concept in the DTM.
Refer to the Searchline Excel Plus & Searchline Excel Edge Device Type Manager User Manual for more information.
The secondary controller can be a handheld terminal. The detector has been tested with industry standard handheld
communicators.
Connection
It is best to use a dedicated HART interface point to connect a HART controller (primary or secondary).
If such an interface is not available, it is possible to connect to HART signal across a load resistor in the current loop,
point-to-point mode. For example, provided there is the minimum resistance of 250 Ω in the 420 mA loop, the HART
handheld device can be connected across the terminals in the junction box.
WARNING
!
If using multi-drop mode, the mA output cannot be used to provide a functional safety rated output signal.
CAUTION
!
Searchline Excel Plus & Searchline Excel Edge have a real time clock, which is factory set to UTC time.
Using a handheld field communicator, do NOT set HART to nonUTC time. Changing detector’s UTC setting
may cause connection issues.
NOTE
The Fixed Platform App uses GMT time. The App auto-translates detector’s UTC timestamps to local timestamps.
10.1.1Searchline Excel Plus & Searchline Excel Edge HART Interface
CAUTION
!
User is responsible for physical security of HART 4–20 mA loop cable by preventing unauthorized access to
the communication line.
Access Levels and Password Protection
Searchline Excel Plus & Searchline Excel Edge user interface recognizes two login profiles. The default profile ‘Guest’ offers
limited access rights. The second profile ‘Engineer’ is available to wider engineering personnel.

Honeywell SEARCHLINE EXCEL PLUS Specifications

General

Brand	Honeywell
Model	SEARCHLINE EXCEL PLUS
Category	Gas Detectors
Language	English