Eaton MTL4851 and MTL4852 HART® connection systems

• Designed to mount directly to a range of general purpose HART®

connection units and IS backplanes

• Provides a simple interface to smart devices in the field

• Connect up to 7936 HART® devices on a single RS485 network

• LED indication for fault diagnosis

• Auto baud rate detection

• Connectivity to HART® configuration and Instrument Management

software (IMS)

The MTL4851 and MTL4852 HART connection system provides a simple

interface between smart devices in the field, control systems and HART

instrument management software run on a pc.

The system is based on 16-channel modularity to provide a compact,

easily configurable and expandable system. Using a standard RS485 serial

link up to 7936 HART devices can be connected on a single network.

For the optimum solution, choose from a range of general purpose

and IS termination boards. For maximum flexibility the HMM64 HART

backplane locates an MTL4851 master communications module and

up to three MTL4852 secondary interface modules, with each module

connecting to 16 field devices. General purpose HART connection units

and IS backplanes are available fitted with an cable interface connection

to the HMM64. This system can be extended with further HMS64 HART

backplanes linked to the master, each carrying up to four MTL4852

secondary interface modules.

The MTL4851 and MTL4852 modules can also be located on HTP

SC16x termination boards for general purpose applications. HART loops

are simply wired through these HART Termination Panels and may be

grounded or floating circuits. The HTP boards offer a compact and cost

effective solution for general applications. CPH-SC16x backplanes are

ideal for signal loops requiring intrinsic safety (IS) protection, combining

multiplexer and IS isolator mounting. This offers considerable simplification

in wiring when compared to DIN-rail based solutions.

The HCU16 HART units connect to 16 general purpose field instruments

while maintaining channel to channel isolation. Resistor conditioning

options are compatible with all types of I/O cards. It allows pass-through

connections for transmitter power supply, input signal and common.

The HCU16AO unit includes HART filters for use with I/O cards that are

incompatible with HART communication signals.

Customised backplanes and connection units are available to provide

direct connection from DCS I/O cables, replacing the standard termination

boards.

See also the MTL4850 datasheet for alternative HART solutions using a

32 channel multiplexer module ideally suited for use in conjunction with

emergency shutdown and safety systems.

Connectivity to HART Configuration and Instrument Management

Software :

The online access to the information contained within HART devices

allows users to diagnose field device troubles before they lead to costly

problems. Software can capture and use diagnostic data from HART

field instruments via the MTL HART connection hardware. This allows

users to realise the full potential of their field devices to optimise plant

assets, which results in significant operations improvement and direct

maintenance savings.

IMS products provide essential configuration, calibration, monitoring

and maintenance history functions for conventional analogue (4-20 mA)

and HART protocol compatible smart process instruments and field

devices. They deliver powerful tools to meet the need for standardised

instrument maintenance procedures and record keeping mandated by

some quality standards and regulatory bodies.

The benefits of utilising these powerful software packages online

include:

• Reduced commissioning time and costs

• Reduced maintenance costs

• Reduced documentation

• Reduced process downtime

The MTL485x offers connectivity to a comprehensive range of FDT

based software packages via the comms Device Type Manager (DTM).

The DTM can be downloaded from www.mtl-inst.com. Other software

packages, such as AMS from Emerson, work with the MTL485x through

custom software drivers or by the inclusion of the device description (DD)

file for the MTL multiplexers.