Description
Detailed Parameter Table
| Parameter Name | Parameter Value |
| Product Model | IMASI23 |
| Manufacturer | ABB |
| Product Category | Analog Input Module (Advant OCS Series) |
| Input Type | 4-20 mA / 0-20 mA |
| Channel Count | 16 channels |
| Resolution | 14-bit |
| Accuracy | ±0.1% of span |
| Isolation | 500 VAC channel-to-channel |
| Sampling Rate | 10 samples/sec (aggregate) |
| Connection Interface | 25-pin D-sub connector |
| Power Consumption | 1.2 W (typical) |
| Operating Temperature | 0°C to +60°C |
| Certifications | CE, UL 508, EN 50081-2 (EMC) |
ABB IMASI23
Product Introduction
The ABB IMASI23 is a legacy analog input module designed for ABB’s Advant OCS (Open Control System) platform. This 16-channel module provides robust current signal acquisition (4-20mA/0-20mA) from field instruments like pressure transmitters, flow meters, and temperature sensors. As part of ABB’s distributed control architecture, the IMASI23 interfaces with Master Piece 200/200HC controllers via the Advant Fieldbus 100 (AF100) network, enabling real-time process monitoring in industrial applications.
Engineered for reliability in harsh environments, the module features individual channel isolation and built-in surge protection. The IMASI23 supports flexible configuration through Composer OCS engineering tools, allowing customized scaling, filtering, and alarm thresholds. Though superseded by modern S800 I/O systems, it remains critical for maintaining operational continuity in legacy installations across power generation, pulp/paper, and water treatment facilities.
Core Advantages and Technical Highlights
Signal Integrity:
Individual channel isolation (500VAC) prevents cross-talk and ground loops. ±0.1% baseline accuracy with automatic cold junction compensation for thermocouple inputs (when used with external transducers).
Legacy System Integration:
Native compatibility with AF100 fieldbus (1.5 Mbps) enables seamless data exchange with AC 410/450 controllers. Plug-and-play replacement for IMASI01/IMASI02 modules.
Robust Design:
Conformal-coated PCBs withstand 95% non-condensing humidity. Electromagnetic compliance (EN 50081-2) ensures operation in electrically noisy environments.
Diagnostic Capabilities:
Onboard LED per channel indicates signal health. Detects open-circuit (>35kΩ) and under-range (<3.8mA) conditions. Diagnostic alarms routed to Operator Station 410.
Typical Application Scenarios
The ABB IMASI23 maintains critical operations in:
Power Plants: Boiler pressure monitoring in coal-fired units with high-vibration environments
Pulp & Paper Mills: Consistency transmitter inputs for stock preparation control
Water Treatment: Filter differential pressure monitoring across 16-channel cascades
HVAC Systems: Chiller plant temperature acquisition in district cooling networks
Steel Manufacturing: Combustion air flow measurement in reheating furnaces
ABB IMASI23
Related Model Recommendations
IMASV23: Voltage input version (0-10VDC) for same rack
IMDSI23: Digital input module for complementary signal integration
IMESO23: Analog output module for control loop completion
CI522: Communication interface for AF100 to OPC gateway
S800 AI810: Modern analog module (migration path with SAI01 adapter)
Installation, Commissioning and Maintenance Instructions
Installation Preparation:
Verify rack slot compatibility (Advant OCS Series 200 baseplate). Ensure backplane voltage 5V±5%. Use shielded twisted-pair cables (Belden 8761) grounded at control room entry. Maintain 15cm clearance from power lines.
Maintenance Protocol:
Annual calibration with ABB Calibration Toolkit. Quarterly:
Clean D-sub contacts with electronic-grade contact cleaner
Verify terminal block torque (0.4 N·m)
Check isolation resistance (>100 MΩ at 500VDC)
Replace electrolytic capacitors after 10 years of service.
Service and Guarantee Commitment
ABB provides lifecycle support for the IMASI23 including:
15-Year Spare Commitment: Guaranteed availability until 2038
Legacy Technical Support: Migration consultation via ABB Ability™ Lifecycle Services
Recertification Services: Component-level refurbishment with 12-month warranty
Firmware Archives: Historical versions accessible through ABB Support Portal
Note: New units carry 6-month warranty; refurbished units carry 12-month warranty. On-site calibration services available globally.
