ABB LTC391AE01 (HIEE401782R0001) – Communication/Loop Controller Module for Symphony Plus / INFI 90 Racks

The ABB LTC391AE01 – ordering code HIEE401782R0001 – is a plug-in communication/loop controller module typically used within ABB Symphony Plus / INFI 90 systems. From my experience, engineers use it as a reliable backbone interface in node chassis, handling plant-network or loop signals and keeping legacy Harmony/INFI installations running smoothly. You might notice that the E01 revision tracking makes it easy to match firmware across a redundant pair or mixed system.

Company’s Order Placement Process and Guarantees

• Warranty: 365 days
• Delivery time: In-stock items typically ship in 1 week; no more than one month at the latest
• Payment: 50% advance payment, full payment before delivery
• Express delivery: FedEx, UPS, DHL

Key Features

• Symphony Plus / INFI 90 compatibility – Designed to operate in ABB Harmony/INFI racks as a communication or loop controller module.
• E01 firmware/revision – Stable revision that, in many cases, simplifies matching against existing site configurations.
• Backplane-powered – No external power supply; it draws power directly from the system backplane for clean integration.
• Single-slot form factor – Standard INFI 90 mechanical footprint for quick slot-in replacement.
• Diagnostics indicators – Front-panel LEDs (typical for this series) aid in basic health checks and network status at a glance.
• Redundancy-friendly – Commonly used in redundant node designs to maintain uptime during switchover.
• Service/maintenance port – Often includes a front service port for local diagnostics, depending on sub-revision and site setup.

Technical Specifications

Application Fields

Plants running ABB Symphony Plus / INFI 90 typically deploy the LTC391AE01 as part of their control network infrastructure. It seems to be most common in:

• Power generation (baseload and peaker stations with Harmony nodes)
• Oil & gas (upstream facilities and pipeline stations)
• Chemicals and petrochemicals (legacy unit controls and revamps)
• Pulp & paper (paper machine drives and process sections)
• Metals & mining (mill drives, material handling)

A maintenance lead at a combined-cycle plant told us they swapped an older communication card for an LTC391AE01 and it slotted straight in—no wiring changes—and the node re-synced within minutes. That’s the kind of low-risk upgrade teams look for.

Advantages & Value

• Drop-in replacement – Form-fit-function for INFI 90 racks reduces outage time and integration risk.
• Lifecycle support – Helps extend the useful life of installed Harmony assets without a full migration.
• Reliable operation – The E01 revision is known for stable behavior in most site conditions.
• Cost control – Avoids large-scale re-engineering; minimal commissioning effort in many cases.
• Procurement confidence – Units are function-tested with a 365-day warranty for peace of mind.

Installation & Maintenance

• Cabinet environment – Install in a clean, dry control cabinet with adequate ventilation. Typical INFI racks meet these requirements.
• Handling – Observe ESD precautions; power down the rack before insertion/removal.
• Seating & wiring – Ensure connectors are fully seated. If a front service port is used, secure RS-232 cabling to avoid strain.
• Grounding – Verify rack grounding and shield terminations to minimize communication noise.
• Routine checks – Periodically inspect LED status, clean dust from front panel, and review network diagnostics.
• Firmware alignment – Match E01 revision across redundant pairs when possible to keep behavior consistent.

Quality & Certifications

• Certifications – CE compliant; UL for industrial control equipment is typical for this series; RoHS depends on production year.
• Manufacturer – ABB (Harmony / INFI 90 family)
• Warranty – 365 days

If you need confirmation against a specific rack type, node configuration, or firmware baseline, share the installed base details and we’ll verify compatibility before you place the order.