Description
The ABB AI835A (3BSE051306R1) is a high-performance analog input module belonging to the S800 I/O distributed control family. Engineered for precision, it features eight differential input channels designed to process millivolt signals or a wide variety of thermocouple types. This module is essential for applications requiring high-accuracy temperature monitoring within the ABB Ability System 800xA environment.
Features
- Eight isolated differential input channels.
- Supports linear millivolt measurements (-30 mV to +75 mV).
- Compatible with a broad range of thermocouple types: B, C, D, E, J, K, L, N, R, S, T, and U.
- Channel 8 configurable as a Cold Junction (CJ) reference channel using a Pt100 RTD.
- 15-bit A/D resolution for high-precision signal conversion.
- Integrated wire-break and open-circuit monitoring for improved diagnostic reliability.
Applications
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Power Generation: Monitoring turbine exhaust and boiler temperatures.
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Chemical Processing: Tracking reactor and fluid line thermal profiles.
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Oil & Gas: Precision data acquisition for remote extraction and refining processes.
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Manufacturing & Metallurgy: Managing furnace, casting, and curing temperatures.
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Water Treatment: Climate and liquid temperature tracking.
Technical Specifications
| Model |
AI835A (3BSE051306R1) |
| Number of Channels |
8 |
| Resolution |
15 bits |
| Input Impedance |
> 1 MΩ |
| Common Mode Rejection (CMRR) |
120 dB (50/60 Hz) |
| Normal Mode Rejection (NMRR) |
> 60 dB (50/60 Hz) |
| Power Dissipation |
1.6 W |
| Current Consumption (+5V) |
75 mA |
| Current Consumption (+24V) |
50 mA |
| Max Field Cable Length |
600 meters |
| Rated Insulation Voltage |
50 V |
Installation Guidelines
- Ensure the system power is disconnected before installing or removing the module from the Modulebus.
- The module must be mounted on a compatible S800 I/O MTU (Module Termination Unit).
- Maintain proper grounding practices to ensure signal integrity and reduce electromagnetic interference.
- Use shielded twisted-pair cabling for field sensors to minimize noise, keeping cable runs under 600 meters.
- When using Channel 8 for Cold Junction compensation, ensure the Pt100 RTD is correctly wired to the MTU terminals.
- Handle modules in accordance with standard ESD (Electrostatic Discharge) protection protocols.
FAQs
What is the primary function of the AI835A?
The AI835A is an analog input module used in S800 I/O systems to convert thermocouple or millivolt signals into digital data for process control.
Can I use Channel 8 for standard inputs?
Yes, if you do not require internal Cold Junction compensation, Channel 8 can be configured as a standard input channel, provided a fixed junction temperature is defined in the application parameters.
Is this module compatible with HART?
No, the AI835A does not support HART communication or Sequence of Events (SOE) time-tagging.
