This high-density analog input module processes field signals for ABB AC 800M distributed control systems. The ABB IMASI23 provides eight isolated channels that accept standard 4–20 mA current signals from transmitters and sensors. Its robust isolation design ensures measurement integrity in electrically noisy industrial environments.
Key Technical Specifications
| Parameter | Details |
|---|---|
| Model | ABB IMASI23 |
| Product Type | Analog Input Module |
| Dimensions (W x H x D) | 45 mm x 120 mm x 130 mm |
| Weight | 0.40 kg |
| Number of Inputs | 8 channels (individually isolated) |
| Input Signal Type | 4–20 mA current (2-wire transmitters) |
| Input Impedance | 250 Ω per channel |
| Resolution | 12 bits (0.1 % of full scale) |
| Accuracy | ±0.2 % of span at 25 °C |
| Isolation Voltage | 1,500 V AC (channel-to-bus and channel-to-channel) |
| Conversion Time | 20 ms per channel (cyclic scanning) |
| Bus Interface | S800 I/O backplane connector |
| Power Consumption | 50 mA at 24 V DC (from backplane) |
| Operating Temperature | 0 °C to +55 °C |
| Protection Class | IP20 |
| Field Wiring | Removable screw terminal block (28–12 AWG) |
Input Architecture and Signal Processing
The ABB IMASI23 accepts 4–20 mA signals from two-wire pressure, temperature, and flow transmitters with loop power provided externally. Each of its eight channels features individual galvanic isolation, eliminating ground loop errors and protecting the backplane from surges. A 12-bit resolution delivers reliable measurement granularity for process variables across the full scale. Moreover, the 20 ms cyclic conversion time ensures smooth data updates for monitoring and control loops.
Mechanical Design and Module Integration
This analog module occupies a single slot in the S800 I/O rack and measures 45 mm wide, 120 mm high, and 130 mm deep. Its 0.40 kg weight allows straightforward installation without specialized mounting hardware. A removable screw terminal block accepts 28 to 12 AWG wires, simplifying field cable connections and maintenance replacements. LED indicators on the front panel provide channel status and module health information.
Isolation Performance and Noise Immunity
The ABB IMASI23 offers 1,500 V AC isolation between input channels and between channels and the system bus. This comprehensive isolation protects measurement accuracy in environments with variable frequency drives and heavy motor loads. The 250 Ω input impedance presents an optimal load for standard 4–20 mA transmitters without introducing signal distortion. Built-in filtering attenuates high-frequency noise that could otherwise affect measurement stability.
Power Efficiency and Environmental Suitability
This module consumes a modest 50 mA from the 24 V DC backplane supply, minimizing energy usage within multi-module racks. Its 0 °C to 55 °C operating temperature range supports standard indoor industrial installations without derating. An IP20 protection rating requires enclosure mounting but allows easy front-panel access for wiring verification.
System Compatibility and Application Domains
The ABB IMASI23 connects directly to ABB AC 800M controllers through the S800 backplane bus for deterministic data exchange. It integrates seamlessly with 800xA and Compact Control Builder engineering environments. Consequently, this analog input module serves refining processes, chemical reactors, power generation plants, and water treatment facilities with demanding measurement requirements.
Details
| Weight | 0.40 kg |
|---|---|
| Dimensions | 45 × 120 × 130 mm |
