RELIANCE 57442-1D （57C442A)Data Highway Plus (DH+) Interface Module_Ningde Androld Automation Equipment Co.,Ltd.

June 01, 2026

RELIANCE 57442-1D （57C442A)Data Highway Plus (DH+) Interface Module

The RELIANCE 57442-1D (also marked 57C442A) is a Data Highway Plus (DH+) Interface Module for the AutoMax DCS 5000 platform. It provides high-speed, deterministic communication between AutoMax controllers and Allen‑Bradley (Rockwell) PLCs, HMIs, and I/O devices on DH+ networks. The 1D revision brings enhanced firmware, stronger electrical isolation, and improved noise immunity compared to older 57442-1C/1B versions.

Description

Product Overview

Model Definition

RELIANCE: Brand (now part of ABB/Baldor).
57442: Core series for A‑B DH+ Interface Modules in AutoMax systems.
1D: Hardware revision (upgraded from 1C); corresponds to 57C442A (industry standard part number).
Alternative PN: 0-57442-1D (full OEM number).

Technical Parameters

Backplane Power: 5VDC, 650mA (3.25W).
Network Protocol: Allen‑Bradley Data Highway Plus (DH+).
Baud Rate: 57.6 kbps / 115.2 kbps / 230.4 kbps (selectable).
Memory: 32KB dual‑port RAM (shared between backplane and DH+).
Node Address: 0–7 (set via rotary switches).
Operating Temperature: 0°C to +60°C; storage -40°C to +85°C.
Diagnostics: 7‑segment LED (fault codes), green “OK” LED, red “FAULT” LED.
Form Factor: Single‑slot AutoMax rack; dimensions 11.75” H × 1.25” W × 7.37” D.
Certifications: UL, CE; industrial‑grade, IP20 protection.
Weight: ~0.73kg (1.6 lbs).

Interface & Communication Configuration

Backplane Interface: Connects to AutoMax DCS 5000 backplane for power and internal data exchange.
DH+ Port: Isolated DB9 connector (or terminal block) for A‑B DH+ network; supports daisy‑chain topology.
Front‑Panel Indicators:
- OK (Green): Module powered and operational.
- FAULT (Red): Communication error or hardware fault.
- 7‑Segment Display: Shows fault codes (e.g., “E02” for node address conflict).

Core Functions

DH+ Protocol Handling: Manages all DH+ protocol layers, enabling seamless integration with Rockwell Automation devices.
Data Routing: Exchanges I/O data, control commands, and status information between AutoMax and A‑B systems.
Network Management: Controls DH+ network traffic, ensuring deterministic data delivery and collision avoidance.
Diagnostic Monitoring: Real‑time fault reporting via LEDs and 7‑segment display for quick troubleshooting.
System Expansion: Facilitates integration of A‑B I/O racks and HMIs into AutoMax‑based DCS.

Application Scenarios

Used in large‑scale industrial automation across metallurgy, steel, mining, paper, and material handling. Ideal for plants with mixed AutoMax and Allen‑Bradley systems (e.g., rolling mills, conveyor lines, cranes, and plant‑wide DCS installations). Fully compatible with AutoMax DCS 5000 and Mark V systems.

Operation & Maintenance Instructions

Installation: Power off the rack before insertion. Seat firmly in a single slot and secure. Connect DH+ network wiring per DB9 pinout; set node address via rotary switches.
Operation: Keep the rack area dry, ventilated, and free of dust/corrosive gases. Monitor front‑panel LEDs and 7‑segment display for status/faults.
Maintenance: Periodically check connectors for tightness/aging; clean indicators and ports. Avoid static electricity when handling.
Troubleshooting: If fault codes appear, power off, re‑seat the module, and inspect DH+ wiring. Do not disassemble the housing. Replace only with 57442-1D or compatible 57C442A to ensure network compatibility.

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