ABB AI531 AC500 High-Resolution Analog Input Module
Eight 16-bit multifunction inputs support voltage, current, RTD, resistance and thermocouple measurements.
Overview
ABB AI531 is a multifunction S500 analog input module for measurement tasks that require broader sensor coverage and higher resolution than the AI523. Its eight individually configurable inputs support voltage, current, resistance thermometers, resistance, thermocouples and digital-input use. The current data sheet specifies 16-bit resolution including sign, module-level isolation, configurable line-frequency suppression and a 100 m analog-cable limit. The exact 1SAP250600R0001 article is the standard AC500 version; AI531-XC is a separate ordering variant.
Specs
| Manufacturer | ABB |
|---|---|
| Article Number | 1SAP250600R0001 |
| Product Family | AC500 / S500 |
| Module Type | Multifunction analog input module |
| Analog Inputs | 8 individually configurable channels |
| Measurement Functions | Voltage, current, Pt100/Pt1000, Ni1000, Cu50, resistance and thermocouples J/K/N/S/T |
| Resolution | 16 bits including sign |
| Conversion Time | 1 ms without line-frequency suppression; 100 ms at 50/60 Hz suppression |
| Process Voltage | 24 V DC |
| Normal UP Current | 130 mA |
| Maximum Analog Cable Length | 100 m |
| Galvanic Isolation | Module against internal supply and other modules |
| Input Indication | One value-dependent yellow LED per channel |
| Lifecycle | Active |
Features
Core Functions
- Supports low-level voltage, current, resistance, RTD and thermocouple measurements.
- Provides 16-bit resolution including sign for precision-oriented channels.
- Offers selectable 50 Hz or 60 Hz line-frequency suppression.
- Allows analog channels to be used as 24 V digital inputs when configured accordingly.
- Protects inputs against temporary overvoltage and switches current inputs to high impedance on overflow.
- Uses eight channel LEDs together with supply and error indicators.
Product Identity
- Manufacturer: ABB
- Model: AI531
- Product Type: AC500 S500 multifunction analog input module
- Status: Active product
Applications
- Precision temperature measurement using RTDs or thermocouples.
- Strain, resistance and low-level voltage acquisition in test or machine systems.
- Mixed-sensor process stations that benefit from one configurable module type.
- AC500 panels requiring power-line frequency suppression for sensitive measurements.
- Modernization projects where AI531 must remain distinct from the denser but lower-resolution AI523.
Lifecycle
- ABB lists 1SAP250600R0001 as an Active standard product.
- The AI531-XC article is intended for harsher environments and is ordered separately.
- Record the exact signal mode and compensation method for every thermocouple channel.
- Preserve line-frequency suppression, scaling and wire-break diagnostic parameters.
- After replacement, validate cold-junction or external compensation and the controller conversion logic.
FAQ
Which thermocouple types are supported by AI531?
ABB documents types J, K, N, S and T.
What is the AI531 conversion resolution?
The current ABB data sheet specifies 16 bits including sign.
How does line-frequency suppression affect conversion time?
Conversion is 1 ms without suppression and 100 ms per channel with 50 Hz or 60 Hz suppression.
Can AI531 channels be used as digital inputs?
Yes. ABB includes a configurable digital-input mode for the analog channels.
Which exact standard article number belongs to AI531?
The standard module is 1SAP250600R0001; the XC version uses a different article number.
Why is AI531 not interchangeable with AI523 by channel count alone?
AI531 has eight higher-resolution multifunction channels, while AI523 has sixteen 12-bit voltage/current/RTD channels.
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