Pepperl+Fuchs KFD2-HMM-16 HART Multiplexer Master

Technical Overview

16-channel HART MUX Primary Module expandable to 256 devices, featuring SIL 3 functional safety and RS-485 communication for industrial automation.

Key Features

16-channel HART MUX Primary Module.
HART field device input (revision 5 to 7) for broad compatibility.
Expandable to manage up to 256 analog field devices by connecting up to 15 KFD0-HMS-16 secondary modules.
RS-485, 2-wire multidrop interface for reliable data transfer to a PC.
Selectable data transfer rates of 9600, 19200, or 38400 Bit/s via DIL switches.
Achieves up to Safety Integrity Level (SIL) 3 according to IEC/EN 61508 for critical safety applications.
Configurable via DIP switches for address selection (1 of 31 possible addresses) and baud rate settings.
Designed for mounting on a 35 mm DIN mounting rail in accordance with EN 60715:2001.
Offers an IP20 degree of protection against solid objects larger than 12.5mm, suitable for enclosed environments.

Technical Specification Matrix

Parameter	Value
Supply Voltage	20 ... 32 V DC
Current Consumption	Typical 100 mA
Power Consumption	Max. 3 W
Degree of Protection	IP20
Ambient Temperature	-20 ... 60 °C (-4 ... 140 °F)
Safety Integrity Level (SIL)	SIL 3 acc. to IEC/EN 61508
HART Field Device Input Revision	5 to 7
Interface Type	RS-485, 2-wire multidrop
Transfer Rate	9600, 19200, or 38400 Bit/s (selectable)
Mounting	35 mm DIN mounting rail acc. to EN 60715:2001
HART Signal Channels	16 (expandable to 256 with secondary modules)
Input Voltage Range (HART)	0.08 ... 4 V ss; typ. ± 5.2 V as local reference
Ex Marking	1 II 3G Ex nA IIC T4 Gc (for application in connection with hazardous areas)
Physical Weight (kg)	0.25
Dimensions L x W x H (cm)	11.5 x 4 x 10.7

Industrial Applications

1. Process Plant Monitoring and Control System Integration

The KFD2-HMM-16 serves as a central gateway in large-scale chemical or oil & gas processing plants, consolidating HART data from up to 256 distributed sensors such as pressure, temperature, and flow transmitters. This integration feeds crucial process variables into the main control system.

Problem Solved

This module simplifies the complex wiring and individual connection requirements for numerous HART field devices, reducing installation costs and system complexity. Its SIL 3 functional safety rating ensures high integrity for critical process control loops, while the RS-485 interface allows for robust, long-distance communication back to the central control room for efficient data acquisition.

HART communicationProcess ControlDistributed Control System (DCS)FieldbusFunctional Safety (SIL 3)RS-485Data Acquisition

2. Smart Instrument Management for Predictive Maintenance

In industrial facilities aiming for enhanced operational uptime, the KFD2-HMM-16 connects to a multitude of smart HART instruments, including valve positioners and level transmitters. It continuously collects diagnostic and status information, feeding this data into a centralized maintenance system like PACTware or AMS.

Problem Solved

This solution enables effective predictive maintenance strategies by centralizing HART diagnostic data, allowing for proactive identification of potential equipment failures. This leads to optimized maintenance scheduling, reduced unplanned downtime, and extended asset life. The 16-channel base, expandable to 256 devices, provides scalability for varying plant sizes and numerous smart instruments.

Predictive MaintenanceAsset Management System (AMS)HART DiagnosticsSmart InstrumentsCondition MonitoringRS-485 InterfaceDowntime Reduction

3. Remote Terminal Unit (RTU) Data Aggregation in Hazardous Area Zone 2

For remote industrial sites or specific areas within a plant classified as hazardous (e.g., Zone 2 explosive atmospheres), the KFD2-HMM-16 interfaces with 16 to 256 HART devices. Its Ex nA IIC T4 Gc marking ensures suitability for such environments, facilitating safe data gathering.

Problem Solved

The module provides a safe and compliant method for aggregating HART data from field devices located in Zone 2 hazardous areas, transmitting it securely to a control system in a safe area via its RS-485 interface. While the module itself has an IP20 rating, its certification for hazardous areas allows for installation within an appropriate, certified enclosure, ensuring protection against environmental ingress and adherence to safety regulations.

Hazardous Area (Zone 2)Ex nARemote Terminal Unit (RTU)HART protocolData AcquisitionRS-485Industrial EnclosuresSafety Compliance