ABB HESG324389 HESG324426R0001
ABB HESG324389 HESG324426R0001
ABB HESG324389 HESG324426R0001
ABB HESG324389 HESG324426R0001
ABB HESG324389 HESG324426R0001

ABB HESG324426R0001 HESG324389 | Industrial DCS 32-Channel Digital Input Interface

  • Brand: ABB
  • Model: HESG324389
  • Product Code: HESG324426R0001
  • Product Type: Digital Input Module
  • Series: Advant OCS (Advanced Open Control System)
  • Core Function: Acquires 32-channel discrete signals (dry contact/solid-state) from field devices, conditions and isolates signals, and transmits data to Advant OCS controllers for logic processing in industrial automation systems.
  • Key Specs: 32 isolated channels, 24V DC input (18-30V DC range), 2500VAC isolation, ≤5ms response time, -25°C to +60°C operating temperature, hot-swappable design.
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Part number: ABB HESG324426R0001 HESG324389
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Description

HESG324389 HESG324426R0001: Product Overview
The ABB HESG324389 (product code HESG324426R0001) is a 32-channel digital input module within ABB’s Advant OCS (Advanced Open Control System) series, designed for integration into Advant OCS I/O racks to serve as a front-end interface for discrete signal acquisition. Its primary role is to convert field device signals—such as proximity switches, limit switches, pushbuttons, and valve position indicators—into digital data that Advant OCS controllers (e.g., AC410) can process for control logic execution. This module is critical for maintaining accurate representation of plant states in continuous process industries, where reliable discrete signal acquisition directly impacts safety and operational efficiency.
Functionally, the module processes inputs from 32 independently isolated channels, each configurable for 24V DC dry contact (relay) or solid-state (transistor) signals. It employs galvanic isolation (2500VAC) to mitigate ground loop interference and electromagnetic noise, ensuring signal integrity in electrically harsh environments. Communication with the controller occurs via the Advant OCS backplane, supporting cyclic data exchange for real-time control and acyclic messages for diagnostics. As part of the Advant OCS family, the module leverages the platform’s modular architecture, hot-swappable components, and compatibility with legacy engineering tools like Control Builder. Benefits include simplified system expansion, reduced wiring complexity, and unified configuration workflows across I/O racks.

ABB HESG324389 HESG324426R0001

ABB HESG324389 HESG324426R0001

HESG324389 HESG324426R0001: Technical Specifications
  • Model Number: HESG324389
  • Product Code: HESG324426R0001
  • Manufacturer: ABB
  • Product Type: Digital Input Module
  • Number of Channels: 32 (individually isolated)
  • Input Type: Dry contact (relay), Solid-state (transistor)
  • Input Voltage: 24V DC nominal (18-30V DC range)
  • Isolation Voltage: 2500VAC (channel-to-channel, channel-to-bus)
  • Signal Response Time: <5 ms (input change to controller update)
  • Operating Temperature: -25°C to +60°C
  • Humidity Range: 5% to 95% non-condensing
  • Power Supply: 24V DC (from Advant OCS rack backplane, 18-32V DC range)
  • Power Consumption: 2.0W (typical, all channels active)
  • Dimensions: 245mm x 135mm x 115mm (width x height x depth, fits Advant OCS rack)
  • Weight: 0.45kg
  • Certifications: CE, UL, cULus, RoHS
Core Features & Customer Value​
The HESG324389 HESG324426R0001 is engineered to deliver reliable discrete signal acquisition and simplify maintenance in industrial automation. Its 32-channel density significantly reduces cabinet footprint compared to lower-density modules, minimizing wiring complexity and material costs in systems with numerous discrete devices (e.g., an assembly line with 20 proximity switches and 12 pushbuttons). For engineers, this streamlines initial installation and reduces potential points of failure.
Galvanic isolation (2500VAC) is critical for signal integrity. In chemical plants with high-power agitators or VFDs, EMI can corrupt digital signals, leading to false trip commands. The module’s isolation ensures limit switch activations or emergency stop signals are transmitted accurately—vital for preventing over-pressurization or equipment damage. Per-channel short-circuit protection further safeguards against wiring faults.
Built-in diagnostics enhance maintenance efficiency. The module monitors channel faults (short/open circuit), power supply health, and communication status, reporting issues to the Advant OCS controller via LED indicators and software logs. For maintenance teams, this reduces troubleshooting time from hours to minutes; a failed proximity switch in an automotive assembly line can be identified without invasive testing.
Hot-swap capability allows replacement without system shutdown, critical for continuous processes like oil refining. Technicians remove the faulty module and install a new one; the controller automatically reloads configuration data, eliminating scheduled downtime. Integration with legacy engineering tools enables engineers to reuse I/O profiles across projects, cutting commissioning time by 15-20%.

ABB HESG324389 HESG324426R0001

ABB HESG324389 HESG324426R0001

Typical Applications​
The ABB HESG324389 HESG324426R0001 is deployed in Advant OCS environments requiring high-density discrete signal acquisition. In a petroleum refinery’s crude distillation unit, it connects 32 temperature switch inputs (dry contact) to the Advant OCS controller, monitoring column tray temperatures. The 2500VAC isolation withstands EMI from nearby pumps, ensuring reliable data for control valve adjustments.
At a chemical plant’s polymerization reactor, the module acquires 16 agitator overload switch signals (dry contact) and 16 valve position feedback signals (solid-state). Its -25°C cold-start capability supports winter startups, and hot-swap functionality allows maintenance during planned turnarounds without halting production.
In a municipal wastewater treatment facility, the module interfaces with 24 pump status switches (dry contact) and 8 level indicator contacts (solid-state) across lift stations. Data is transmitted to the central SCADA system via the Advant OCS controller, enabling remote monitoring of pump health. The compact size (245x135x115mm) fits into space-constrained I/O racks, simplifying retrofits in aging facilities.

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