Product Overview
When hazardous area installations demand reliable analog signal acquisition, the ABB AI931B (3KDE175512L9310) delivers. This 4-channel analog input module is part of the S900 I/O family, designed for installation directly in Zone 2 hazardous areas. It accepts passive 0/4...20 mA signals from intrinsically safe field devices located in Zone 2, Zone 1, or Zone 0. The AI931B communicates via PROFIBUS DP, reducing marshalling and wiring costs by placing I/O in the field.
Technical Specifications
- Number of channels: 4
- Signal type: 4...20 mA (passive inputs)
- HART support: Yes (cyclic HART variables and HART frame transmission)
- Intrinsic safety: Yes
- Redundancy: No
- Mechanics: S900
- Dimensions: Width 20 mm, Depth 104 mm, Height 104 mm
- Weight: 0.13 kg (0.28 lbs.)
- Ambient temperature: -20 °C to 60 °C
- Relative humidity: Max 93 % +/- 3 % at 40°C
- Corrosive atmosphere: ISA-S71.04 G3 coating
- Certifications: ATEX Zone 2, CE mark, RoHS (DIRECTIVE/2011/65/EU), WEEE (DIRECTIVE/2012/19/EU)
Industry Applications
The AI931B excels in oil and gas, chemical, and pharmaceutical facilities where hazardous areas require robust analog input acquisition. For example, in a refinery, the module connects to pressure transmitters in Zone 1 areas, transmitting 4...20 mA signals and HART variables to the control system via PROFIBUS DP. This eliminates long cable runs and reduces installation costs. The passive input design ensures compatibility with intrinsically safe loops, maintaining safety integrity.
Installation & Setup Guidance
Mount the AI931B on an S900 bus rail in Zone 2. Ensure the power supply and communication bus are properly connected before inserting the module. The hot swap functionality allows replacement during operation without interrupting primary voltage. Use shielded twisted-pair cables for analog inputs to minimize noise. Configure the module using FDT/DTM for diagnostics and parameterization.
Maintenance & Reliability
The AI931B includes extended diagnostics and auto-diagnostics for simplified maintenance. The G3 coating protects against corrosive atmospheres, extending service life in harsh environments. Short and break detection on each channel alerts operators to wiring faults. Periodic inspection of connections and environmental conditions is recommended. The hot configuration in run feature enables adjustments without system downtime.
Compatibility & Integration
The AI931B integrates seamlessly with ABB S900 I/O systems and communicates via PROFIBUS DP. It supports cyclic HART variables and HART frame transmission, allowing access to device diagnostics and secondary variables. The module is electrically isolated between input/bus and input/power, ensuring reliable operation in mixed environments. Use FDT/DTM for configuration and diagnostics.
Selection Guide & Purchasing Advice
Before ordering the AI931B, verify your system's PROFIBUS DP compatibility and the required intrinsic safety barriers. The module is suitable for Zone 2 installations and accepts passive 4...20 mA inputs. SpareTechPLC stocks the AI931B (3KDE175512L9310) and can provide current availability and lifecycle status. Please confirm your specific requirements with our team to ensure correct selection.
Frequently Asked Questions
Q1: Can the AI931B be used in Zone 1 hazardous areas?
A1: The AI931B is certified for installation in Zone 2. It can connect to intrinsically safe field devices located in Zone 1 or Zone 0, but the module itself must be installed in Zone 2.
Q2: Does the AI931B support HART communication?
A2: Yes, the AI931B supports cyclic HART variables and transmission of HART frames via the fieldbus, enabling access to device diagnostics and secondary process variables.
Q3: What is the maximum ambient temperature for the AI931B?
A3: The module operates in ambient temperatures from -20 °C to 60 °C, with relative humidity up to 93 % at 40°C.
Q4: Is the AI931B hot-swappable?
A4: Yes, the AI931B supports hot swap functionality, allowing replacement during operation without interrupting the primary voltage.
Q5: What type of inputs does the AI931B accept?
A5: The AI931B accepts passive 0/4...20 mA analog inputs from intrinsically safe field devices. It features short and break detection on all four channels.
