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Product Overview
The ABB IMASI23 is a 16-channel universal analog input module for ABB Bailey Harmony Rack I/O systems within the Symphony Enterprise Management and Control System. It is designed to condition, isolate, and convert process signals from thermocouples, RTDs, millivolt sources, and higher-level analog inputs before transferring measurement data to the controller. ABB documentation specifies 24-bit analog-to-digital conversion, with an independent A/D converter for each channel. Each input can be configured for the required signal type, making the module suitable for temperature, pressure, flow, level, and other process measurements.
The unit is also documented as a functional replacement for older IMASI03 and IMASI13 modules, requiring only limited configuration changes. For legacy DCS maintenance, this is a useful lifecycle spare. Personally, I would verify the termination unit, channel configuration, firmware or hardware revision, and existing function-code settings before replacement.
Technical Specifications
| Parameter | Value |
|---|---|
| Product Model | IMASI23 |
| Manufacturer | ABB Bailey |
| Product Type | Universal Analog Input Module |
| System | Symphony Harmony / INFI 90 |
| Analog Input Channels | 16 |
| A/D Resolution | 24 bit |
| Supported Signals | Thermocouple, RTD, millivolt, high-level analog |
| Channel Configuration | Independently configurable |
| Isolation | Isolated analog inputs |
| Power | 5 VDC @ approximately 500 mA |
| Communication / Interface | Harmony Rack I/O Expander Bus |
| Operating Temperature | System dependent; verify installation documentation |
| Mounting | Harmony Rack / MMU |
| Dimensions (HxWxD) | Approx. 358 × 74 × 269 mm; supplier data should be verified |
| Weight | Approx. 0.31 kg in one product listing |
| Typical Interfaces | 16 analog channels and rack backplane interface |
| Status | Legacy / discontinued in some aftermarket catalogs |
ABB’s technical material confirms the 16-channel architecture, 24-bit conversion, independent channel configuration, and compatibility with isolated thermocouple, millivolt, RTD, and high-level analog signals.
ABB IMASI23
Key Features and Benefits
- 16 independent analog input channels for process measurement.
- 24-bit analog-to-digital conversion for high-resolution signal processing.
- Supports thermocouples, RTDs, millivolt sources, and high-level analog signals.
- Provides signal conditioning, filtering, conversion, and isolation at the I/O level.
- Individual channel configuration allows mixed measurement types within one module.
- Designed for ABB Symphony Harmony and INFI 90 control architectures.
- Can serve as a functional replacement for older IMASI03 and IMASI13 modules with appropriate configuration changes.
ABB evolution documentation specifically identifies this module as the functional replacement path for IMASI03/IMASI13 in applicable installations. The upgrade can improve input resolution while reducing lifecycle risk when older spare modules become difficult to source.
Related Models
IMASI03: Earlier ABB Harmony analog input module that can be functionally replaced by IMASI23 in suitable configurations. Configuration changes should be reviewed before migration.
IMASI13: Another legacy 16-channel analog input module for the Harmony/INFI 90 environment. ABB identifies IMASI23 as a functional replacement path.
IMASI02: Earlier analog input module within the Bailey Harmony family. ABB’s evolution documentation identifies IMFEC12 as the preferred functional replacement for specific IMASI02 applications.
IMFEC12: Universal analog input module from the Harmony evolution path, supporting several common voltage and current measurement ranges.
Installation and Maintenance
Before removing the module, document every channel assignment, termination-unit connection, configuration setting, and associated function-code parameter. This is particularly important when thermocouple, RTD, current, and voltage signals are mixed in the same rack.
Use appropriate ESD protection when handling the assembly. Check the mating termination unit and backplane connector for contamination, corrosion, or mechanical damage. After installation, verify module recognition and check each configured channel against a calibrated source or known process value. Temperature channels should also be checked for correct sensor type and wiring arrangement.
For warehouse storage, retain the complete identification label and protect the module in ESD-safe packaging. Keep configuration information with the spare so that the replacement can be commissioned without relying on assumptions about the original setup.
Product Warranty
Warranty coverage depends on supplier condition and testing status. New, surplus, refurbished, and used units may have different terms, so purchasing documentation should specify the exact model, hardware condition, inspection status, and warranty period.
For ABB IMASI23, the critical acceptance criteria are 16-channel configuration, correct Harmony Rack compatibility, matching termination hardware, and successful functional testing before return to service. ABB documentation confirms its role as a universal analog input module and its functional replacement relationship with earlier Harmony modules.
