ABB IW93-2 HESG440356R1 HESG216678/B Digital Interface or Processing Module
The ABB IW93-2 (HESG440356R1 / HESG216678/B) is a specialized Analog/Digital Interface or Processing Module typically used within the ABB Procontrol P13 and early Symphony control systems.
It is often identified as a high-precision signal processing unit for power plant automation and complex drive control.
1. Introduction
The IW93-2 is part of the legacy Procontrol P13 ecosystem, designed to handle specialized signal conditioning or computational tasks that standard I/O modules cannot perform.
The “IW” designation often refers to Interface/Converter (Interfacewandler) functions,
making this module essential for converting non-standard sensor inputs into a format compatible with the P13 system bus.
The dual part numbers (HESG440356R1 for the module assembly and HESG216678/B for the internal board) indicate its specific hardware revision level.
2. Technical Parameter Table
| Parameter | Specification |
| Model Number | IW93-2 |
| Part Number | HESG440356R1 / HESG216678/B |
| System Compatibility | Procontrol P13 / ABB Master |
| Input Channels | Multiple Analog/Binary (Configurable) |
| Supply Voltage | 24 V DC (via backplane) |
| Current Consumption | ~150 mA to 300 mA |
| Operating Temp | 0°C to +60°C |
| Mounting Type | Subrack / Eurocard Format |
| Isolation | Channel-to-Bus Galvanic Isolation |
| Diagnostics | Logic Fault and Signal Health Monitoring |
3. Related Models
IW91 / IW92: Earlier generations for simpler signal conversion.
70PR05: Processor modules that process the data from the IW93-2.
500PSM03: Common power supply module for racks containing IW series cards.
HESG440356R2: A later revision or different configuration of the same module.
4. Product Advantages and Features
High-Precision Conversion: Designed for low-drift signal processing, crucial for sensitive measurements in turbine or boiler control.
Industrial Hardening: Features high immunity to electromagnetic interference (EMI), common in power plant environments.
Modular Design: Follows the Eurocard standard, allowing for easy “plug-and-pull” replacement during maintenance windows.
Reliability: ABB’s HESG series components are known for an extremely long service life, often exceeding 25–30 years in continuous operation.
Built-in Error Detection: Detects sensor wire-breaks or internal module faults, triggering system alarms immediately to prevent logic errors.
5. Application Cases
Power Plant Automation: Managing specialized sensor inputs (like vibration or valve position) for large turbines.
Refinery Control: Interfacing legacy field instrumentation with modern DCS backbones.
Steel & Mining: High-speed signal conditioning for motor speed and torque sensors in rolling mills.
Grid Protection: Used in substation control units to handle analog signals required for bay monitoring.
6. Installation and Maintenance
Installation:
Orientation: Ensure the module is correctly aligned with the guide rails in the P13 subrack.
Power Check: Before insertion, verify the rack power supply is stable at 24V DC to avoid transient damage to the HESG216678/B board.
Addressing: If the module requires hardware addressing, set the DIP switches according to the system’s logic map prior to installation.
Maintenance:
Cleaning: Use non-conductive electronic cleaner for the edge connectors if “Bus Communication” errors occur.
Visual Inspection: Look for aging capacitors or heat stress on the HESG216678/B board components during scheduled outages.
Component Lifecycle: Since this is a legacy part, it is advised to source only certified refurbished or “New Old Stock” (NOS) units for critical replacements.