MTL4840 Series communicate with, configure and monitor HART® smart devices

MTL4840 Series communicate with, configure and monitor HART® smart devices in safe and hazardous areas

I. SIL3 rating

II. Connect up to 7936 loops to a single PC

III. LED indication of loop being scanned

The MTL4840 HART® connection system provides a simple interface between smart devices in the field 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 individual HART® devices can be connected to a single workstation.

For the optimum solution, choose from a range of general purpose and IS termination boards. For maximum flexibility the BPHM64 HART® backplane locates an MTL4841 communications module and up to four MTL4842 interface modules. General purpose HART® connection units and IS backplanes are also available, each fitted with an interface cable for connection to the BPHM64 HART® backplane.

MTL4841 and MTL4842 modules can also be located on HMU16 termination boards for general purpose applications or on BPMH16 / BPMH16U / BPSH16 / BPSH16-32 backplanes for IS isolator

requirements.

The DIN-rail mounting HCU16 and HCU16AOHART® connect to 16 general purpose field instruments while maintaining channel to channel isolation. Resistor conditioning options are compatible with all I/O cards. It allows pass-through connections for transmitter power supply, input signal and common.

I. Easily scalable modular system

II. Compact, ideal for new projects and upgrades

III. Channel to channel isolation option

The HCU16AO unit includes HART® filters for I/O cards incompatible with HART® signals. BPMH16/BPMH16U/BPSH16/BPSH16-32 backplanes with MTL4840 HART® modules fitted, connect either 16 or 32 IS field instruments. Adapter cards are available for the BPMH16U for easy integration to I/O cards and users have a choice of a DIN-rail mounting option.

Numerous features may be included in the connection units and backplanes, as required.

Channel to channel isolation; resistors where required for HART® signal conditioning; and HART® filters for analogue systems where the output signal interferes with HART® data or becomes unstable with the presence of the HART® signal.

Customised backplanes and connection units are available to provide direct connection from DCS I/O cables, replacing the standard termination board.

MTL HART multiplexers are certified by BASEEFA as a safety related sub-system to IEC61508. See the SR Series Interfaces section of this catalogue.

MTL4840 SERIES MODULE SPECIFICATIONS

MTL4841 COMMUNICATIONS MODULE

Host system interface

RS485 2-wire multidrop

Up to 31 MTL4841 modules can be connected to one host station

Unit address: switch-selectable on top of module

Isolation

RS485 output isolated from backplane power supply

Serial communication parameters

RS485 Baud rate: 1.2, 9.6, 19.2, 38.4kbaud, switch- selectable on top of module

RS485 highway length: up to 1km

MTL system interface

Links with up to 16 MTL4842 HART® interface modules via interface bus on backplane/ribbon cable

LED indicators

Green: one provided for power and status indication

Power requirements

Powered from backplane

Power consumption

<1.0W

Instrument management software supported

See 'Instrument management software'

MTL4842 HART® INTERFACE MODULE

MTL systems interface

Links up to 16 loops via backplanes

Receives multiplexer control signals via interface bus from MTL4841 and selects one channel for communication

Unit address

Switch selectable on top of module

Interface bus

Total length of interface bus between module 1 and module 16 must not exceed 4m

LED indicators

Green: one provided for power

Amber: one to indicate unit is selected by MTL4841

Red: four to identify loop address

Power requirements

Powered from backplane

Power consumption

<0.1W

MTL4000 SERIES MODULES

(See 'MTL4000 Series' for detailed specifications and circuit diagrams)

MTL4041A: Current repeater, 4/20mA, passive input for smart transmitters

MTL4041B: Repeater power supply, 4/20mA, for 2- or 3-wire transmitters

MTL4041P: High power repeater power supply, 4/20mA, for 2- or 3-wire transmitters

MTL4044: Repeater power supply, 4/20mA, two channel, for 2 wire transmitters

MTL4046/C: Isolating driver, for HART® valve positioners

MTL4046P: High power isolating driver for HART® valve positioners

COMMON SPECIFICATION

(applies to all MTL4840 and 4000 Series modules)

Location of units

Safe area (MTL4840 can be located in Div2)

Long-term drift

No recalibration necessary

Ambient temperature limits

–20 to +60°C continuous working

–40 to +80°C storage

Humidity

5 to 95% RH (non-condensing)