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MTL 7728+ HART Multiplexer | 8-Channel, IS, DIN Rail, Modbus RTU, RS-485, ATEX Specs

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MTL 7728+ HART Multiplexer | 8-Channel, IS, DIN Rail, Modbus RTU, RS-485, ATEX Specs

MTL 7728+ HART Multiplexer | 8-Channel, IS, DIN Rail, Modbus RTU, RS-485, ATEX Specs
MTL 7728+ HART Multiplexer | 8-Channel, IS, DIN Rail, Modbus RTU, RS-485, ATEX Specs
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Large Image :  MTL 7728+ HART Multiplexer | 8-Channel, IS, DIN Rail, Modbus RTU, RS-485, ATEX Specs Get Best Price

Product Details:
Place of Origin: GB
Brand Name: MTL
Certification: ATEX
Model Number: 7728+
Document: ACH-AB-P+F-E+H-IFM-ASCO-YOK...WA.pdf
Payment & Shipping Terms:
Minimum Order Quantity: 1
Price: Negotiable
Packaging Details: carton
Delivery Time: Negotiable
Payment Terms: T/T,XT,ALIPAY
Supply Ability: 100pcs per month
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Detailed Product Description
Power Supply: 12-30 V DC (Two-wire) Ambient Temperature: -40°C To 80°C (-40°F To 176°F)
Electrical Rating: General Purpose, Explosion-proof, Intrinsic Safety (depends On Certification) Certifications: Standard Models Include ATEX, IECEx, SIL 2 (consult Manual For Specific Ratings)

MTL 7728+ HART Multiplexer | 8-Channel, IS, DIN Rail, Modbus RTU, RS-485, ATEX Specs

MTL 7728+ HART multiplexer specifications. 8-channel, 4-20mA+HART, intrinsic safety, Modbus RTU, RS-485. ATEX/IECEx approved for hazardous areas. 7728 Plus version.

Product Overview

The MTL 7728+​ is an 8-channel HART® multiplexer​ from MTL's 7700 series, designed to interface 4-20mA+HART signals​ from hazardous areas to a Modbus RTU network​ via RS-485. The "+" suffix indicates an enhanced version with advanced diagnostics and HART 7 support. This device provides intrinsic safety protection, HART signal conditioning, and carries ATEX and IECEx approvals​ for Zone 1 hazardous locations. The multiplexer enables digital communication with HART field devices while maintaining traditional 4-20mA analog signaling, all through a single RS-485 connection.

Technical Specifications

Parameter

Specification

Model Number​

7728+

Product Series​

MTL 7700 Series

Product Type​

8-Channel HART Multiplexer with Intrinsic Safety

Safety Standard​

Intrinsic Safety (IS)

Approvals​

ATEX, IECEx, FM (see specific certifications)

Hazardous Area Rating​

Zone 1, IIC, T6 (Gas), A21, T85°C (Dust)

Channel Count​

8 channels (individually isolated)

Channel Type​

4-20mA analog with HART digital communication

Analog Specifications​

Input Signal​

4-20mA DC, 2-wire

Input Impedance​

50 Ω

Burnout Detection​

Upscale, downscale, or hold (software configurable)

Accuracy​

±0.05% of span (analog measurement)

Update Rate​

500 ms per channel (typical, all channels)

Digital Specifications​

HART Protocol​

HART 5, 6, 7 compatible (Bell 202 FSK)

HART Communication​

Point-to-point and multidrop modes

HART Burst Mode​

Supported

HART Variables​

PV, SV, TV, QV (4 process variables)

Communications Interface​

Host Interface​

RS-485, 2-wire, half-duplex

Protocol​

Modbus RTU

Baud Rate​

1200 to 115200 bps (software selectable)

Address Range​

1-247 (Modbus RTU address)

Isolation​

500V AC (field to RS-485, channel to channel)

General Specifications​

Power Supply​

20-30V DC (typically 24V DC)

Power Consumption​

5W typical, 8W maximum

Operating Temperature​

-20°C to +60°C (-4°F to +140°F)

Storage Temperature​

-40°C to +85°C (-40°F to +185°F)

Relative Humidity​

0-95% non-condensing

Connection Type​

Screw terminals (field), pluggable (RS-485)

Wire Size​

0.2-2.5 mm² (24-12 AWG)

Mounting​

DIN rail 35mm

Degree of Protection​

IP20 (requires enclosure)

Dimensions (W × H × D)​

105 × 124 × 115 mm

Weight​

Approx. 450 g

Housing Material​

Polycarbonate/PBT

LED Indicators​

Power, Communication, Channel status (8x)

Configuration​

Software via Modbus or dedicated configurator

Certifications​

ATEX, IECEx, FM, CSA, SIL 2 (architecture dependent)

Note: Specifications are based on MTL 7700 series documentation. The 7728+ is an enhanced version with HART 7 support and advanced diagnostics. Always verify with the latest product datasheet.

Key Features

  • 8-Channel HART Integration:​ Simultaneous 4-20mA and HART communication for 8 field devices

  • Modbus RTU Interface:​ Industry-standard RS-485 Modbus protocol for easy integration

  • HART 7 Support:​ Full compatibility with HART 5, 6, and 7 devices

  • Advanced Diagnostics:​ Channel-level diagnostics for troubleshooting

  • Intrinsic Safety:​ Approved for Zone 1 hazardous locations

  • Individual Channel Isolation:​ 500V AC isolation between all channels

  • Flexible Addressing:​ Modbus RTU address 1-247 for network flexibility

  • Burst Mode Support:​ Reduced polling overhead for HART communication

  • Configurable Sampling:​ Adjustable update rates per channel

  • Global Approvals:​ Certified for international hazardous area applications

HART Capabilities

Feature

Specification

Protocol Version​

HART 5, 6, 7

Communication Modes​

Point-to-point, Multidrop

Burst Mode​

Supported (reduces host polling)

Variables​

PV, SV, TV, QV (4 process variables)

Device Variables​

Up to 256 device-specific variables

Command Support​

Universal, Common Practice, Device Specific

Update Rate​

Configurable per channel

Long Frame Support​

Yes (extended frame format)

Modbus RTU Register Map (Partial)

Register

Type

Description

40001-40008​

Input

Channel 1-8 analog value (4-20mA)

40009-40016​

Input

Channel 1-8 HART PV (primary variable)

40017-40024​

Input

Channel 1-8 HART SV (secondary variable)

40101-40108​

Holding

Channel configuration

40109-40116​

Holding

Alarm thresholds

40201-40208​

Input

Device status and diagnostics

Entity Parameters (for Hazardous Area Design)

Parameter

Symbol

Value

Unit

Maximum Input Voltage (Ui)​

Ui

30

V

Maximum Input Current (Ii)​

Ii

30

mA per channel

Maximum External Capacitance (Co)​

Co

Dependent on connected device

nF

Maximum External Inductance (Lo)​

Lo

Dependent on connected device

mH

Note: The 7728+ is an associated apparatus. Connected HART devices in the hazardous area must be certified as intrinsically safe.

Typical System Configuration

Component

Description

Notes

Field Devices​

8 x HART transmitters

Various types (pressure, temperature, level, flow)

MTL 7728+​

HART multiplexer

Installed in safe area or Zone 2

Cabling​

Individual 2-wire cables

From field devices to multiplexer

RS-485 Network​

2-wire, terminated

To host system (DCS, PLC, SCADA)

Host System​

Modbus RTU master

Polls multiplexer for data

Power Supply​

24V DC, IS rated

For multiplexer and field devices

Typical Applications

  • Process Plant Modernization:​ Adding HART diagnostics to existing 4-20mA loops

  • Asset Management Systems:​ Integration with AMS, DeltaV, or other asset management software

  • Remote Monitoring:​ Centralized monitoring of HART device diagnostics

  • Predictive Maintenance:​ Early fault detection through HART device variables

  • Multidrop Networks:​ Reducing wiring costs with HART multidrop configuration

  • Legacy System Integration:​ Adding HART capability to non-HART capable control systems

  • Tank Farms:​ Multiple level and temperature transmitters

  • Pipeline Monitoring:​ Multiple pressure and flow transmitters

  • Any application requiring​ HART communication from Zone 1 hazardous areas

Important Technical Notes

  1. HART Device Certification:​ All HART field devices in the hazardous area must be certified as intrinsically safe and compatible with the 7728+'s entity parameters.

  2. RS-485 Network:​ Requires proper termination (120Ω at both ends) and correct polarity. Maximum network length is 1200m at 9600 baud.

  3. Power Supply:​ The 24V DC power supply must provide sufficient current for the multiplexer plus all connected field devices. Calculate total loop power requirements.

  4. Configuration:​ The 7728+ requires configuration for baud rate, parity, Modbus address, and HART parameters. Use configuration software or direct Modbus commands.

  5. Grounding:​ Follow manufacturer's grounding instructions. Proper grounding is critical for RS-485 network stability and noise immunity.

  6. HART Communication:​ HART communication shares the same wires as 4-20mA signals. Ensure proper HART network design and avoid ground loops.

  7. Update Rates:​ The multiplexer polls each channel sequentially. Total update time for all 8 channels is approximately 4 seconds at default settings.

  8. Burst Mode:​ Enabling HART burst mode on field devices can significantly reduce polling overhead and improve response times.

  9. Diagnostics:​ Monitor device status registers for early detection of field device issues.

  10. Certification Compliance:​ Verify that the 7728+'s certifications match the hazardous area classification of your application. The "+" version may have enhanced certifications.

Note: This data sheet provides general specifications for the MTL 7728+ HART multiplexer. For complete installation guidelines, configuration procedures, Modbus register maps, and safety instructions, consult the official MTL 7700 Series Technical Manual​ and 7728+ Configuration Guide. Always verify that the product configuration and certifications match your specific application requirements. HART® is a registered trademark of the FieldComm Group.

MTL 7728+ HART Multiplexer | 8-Channel, IS, DIN Rail, Modbus RTU, RS-485, ATEX Specs 0

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MTL 7728+ HART Multiplexer | 8-Channel, IS, DIN Rail, Modbus RTU, RS-485, ATEX Specs 1
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