Product Details
The Honeywell BPHM64, also cataloged as the BPHM64 HART Backplane, operates as a dedicated hardware component for HART interface signal multiplexing and field instrument bus consolidation within Honeywell Experion PKS and DCS platforms. Manufactured by MTL Instruments, the unit hosts up to 1 x MTL4841 communications module and 4 x MTL4842 HART interface modules, routing field digital communication signals directly to higher-level automation networks. It provides physical carrier infrastructure and electrical power distribution to sustain multi-channel HART signal extraction without interrupting underlying control loops.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | BPHM64 |
| Brand | Honeywell / MTL Instruments |
| Origin | UK |
| Weight | 1.5 kg |
| Dimensions | Standard MTL HART backplane footprint |
| Operating Temp | -20 to +60 deg C |
| Power Consumption | 1.35 W maximum (with 1 x MTL4841 and 4 x MTL4842 modules) |
| Module Capacity | 1 x MTL4841 comms module, 4 x MTL4842 HART interface modules |
| System Ratio Requirement | 1 x MTL4841 module required per 16 x MTL4842 modules |
| Cable Interfaces | 4 x DIN41651 20-way ribbon cables (16 HART signal lines + 4 common returns per cable) |
| Field Connections | Screw terminal interface or custom backplane connectors |
4-20 mA HART Loop Protocol & Channel-to-Channel Isolation
The BPHM64 backplane uses isolated signal conditioning channels to decouple digital HART frequency-shift keying (FSK) signals from analog loop currents. Internal galvanic isolation barriers prevent common-mode voltage spikes and ground loop noise from passing between individual transmitter channels or into the host DCS system. By maintaining strict channel-to-channel isolation across all 20-way DIN41651 ribbon cable connections, the backplane preserves 4-20 mA HART loop protocol signal integrity and shields process measurement networks against electromagnetic noise.
Frequently Asked Questions
Q: Can the MTL4842 interface modules be installed or removed while the BPHM64 backplane is powered?
A: Yes, individual HART interface modules support live insertion and removal, provided the multi-pin DIN backplane bus connectors are kept aligned during hot-swapping to avoid shorting adjacent power rails.
Q: How are field instrument signals physically routed to the BPHM64 backplane?
A: Signal connections pass through 4 x DIN41651 20-way ribbon cable assemblies, where each cable carries 16 discrete HART signal connections along with 4 common return lines to screw terminal interfaces.
Field Installation Guidelines
- Mount the backplane securely onto a standard DIN-rail or mounting plate inside the enclosure using all dedicated chassis mounting points.
- Connect the 20-way DIN41651 ribbon cables to the designated I/O terminal blocks, ensuring keyways line up correctly to prevent reverse polarity insertion.
- Verify that the backplane functional earth ground terminal connects to the main cabinet grounding bus bar via a low-impedance conductor.
- Check that the total module complement does not exceed the system ratio limit of one MTL4841 communications module per sixteen MTL4842 HART interface modules.
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
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