This high-density analog output module provides precise current control signals for ABB distributed control systems. The ABB IMASO11 delivers eight channels of 4–20 mA output with enhanced accuracy for demanding process applications. Its compact form factor maximizes I/O density within S800 racks while maintaining signal integrity.
Key Technical Specifications
| Parameter | Details |
|---|---|
| Model | ABB IMASO11 |
| Product Type | Analog Output Module (ASO) |
| Dimensions (W x H x D) | 45 mm x 120 mm x 130 mm |
| Weight | 0.39 kg |
| Number of Outputs | 8 channels (current output only) |
| Output Signal Range | 4–20 mA (standard), 0–20 mA (configurable) |
| Resolution | 12 bits (0.1 % of full scale) |
| Accuracy | ±0.15 % of span at 25 °C |
| Temperature Drift | ±50 ppm/°C maximum |
| Load Impedance | ≤ 600 Ω per channel |
| Isolation Voltage | 1,500 V AC (channel-to-bus) |
| Update Time | 5 ms per channel (cyclic scanning) |
| Bus Interface | S800 I/O backplane connector |
| Power Consumption | 80 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) |
Output Architecture and Signal Precision
The ABB IMASO11 generates 4–20 mA signals with a 12-bit resolution and ±0.15 % accuracy across the full span. Its 5 ms update time per channel supports rapid response for critical control loops and dynamic processes. The module supports both standard 4–20 mA and full-range 0–20 mA output configurations through software selection. Moreover, its ±50 ppm/°C temperature drift ensures stable operation across varying ambient conditions.
Mechanical Construction and Installation
This analog output module occupies a single slot in the S800 I/O rack with its 45 mm width and 130 mm depth dimensions. Its 0.39 kg weight facilitates easy insertion and removal during system maintenance procedures. A removable screw terminal block accepts 28 to 12 AWG field wiring, enabling quick cable changes without disturbing adjacent modules. Green LEDs on the front panel indicate output activity and channel-by-channel operational status.
Load Driving and Protection Features
The ABB IMASO01 drives loads up to 600 Ω per channel, accommodating most standard actuators and valve positioners. Built-in short-circuit protection prevents output damage from accidental wiring faults or cable shorts. The module also includes overtemperature detection that reduces output current when internal temperatures exceed safe limits. Furthermore, diagnostic routines monitor output loop integrity and flag open-circuit conditions to the controller.
Isolation Performance and Environmental Immunity
This output module provides 1,500 V AC isolation between all output channels and the system backplane. Galvanic isolation effectively eliminates ground loops that could compromise control accuracy in large installations. The design incorporates filtering to minimize conducted emissions and prevent interference with nearby sensitive electronics. Additionally, the module withstands common industrial transients without requiring external surge suppression devices.
System Integration and Application Scope
The ABB IMASO11 interfaces directly with AC 800M controllers through the S800 backplane for deterministic command execution. It supports integration with 800xA and Symphony Plus automation platforms for comprehensive process management. Consequently, this analog output module suits oil refining, chemical processing, power generation, and pulp production applications.
Details
| Weight | 0.39 kg |
|---|---|
| Dimensions | 45 × 130 × 120 mm |
