Product Introduction
Signal drift and inaccurate readings can lead to costly process errors. The ABB 07AI91 analog input module provides reliable, high-resolution measurement with built-in diagnostics to prevent failures. Designed as a remote module for the CS31 system bus, the ABB 07AI91 features eight configurable channels for temperature sensors (Pt100/Pt1000, thermocouples J/K/S) or voltage/current inputs. Its self-calibration and comprehensive diagnosis functions ensure long-term stability and minimal downtime.
Technical Specifications Breakdown
| Parameter |
Value |
| Input Channels |
8 (configurable in pairs) |
| Voltage Ranges |
±10 V, ±5 V, ±500 mV, ±50 mV |
| Current Range |
0-20 mA / 4-20 mA (external 250 Ω shunt) |
| Temperature Sensors |
Pt100, Pt1000, Thermocouples J, K, S |
| Resolution |
12 bit + sign |
| Total Error |
< ±0.5% full scale (voltage) |
| Supply Voltage |
24 V DC |
| Max. Current Consumption |
0.15 A |
| Max. Power Dissipation |
3 W |
| Line Frequency Suppression |
50 Hz, 60 Hz, or none |
| Weight |
450 g |
| Dimensions (WxHxD) |
120 x 140 x 85 mm |
The ABB 07AI91 supports multiple sensor types: Pt100 (2 mA excitation, -50 to +400 °C), Pt1000 (0.2 mA excitation), and thermocouples J (Fe-CuNi, 0-1200 °C), K (NiCr-NiAl, 0-1372 °C), and S (Pt10Rh-Pt, 0-1600 °C).
Industry Applications
In high-temperature furnace monitoring, the ABB 07AI91 connects directly to Type J thermocouples, providing linearized readings with 0.1 °C resolution. For process control loops, the module measures 4-20 mA signals from pressure or flow transmitters. Its diagnosis functions detect open circuits, sensor drift, and overvoltage, preventing costly measurement errors. The self-calibration routine runs automatically, maintaining accuracy over the entire 0-55 °C operating range.
Installation & Setup Guidance
Mount the ABB 07AI91 on a DIN rail (15 mm deep) or use four M4 screws. Connect removable terminal blocks with screw-type terminals (max. 2.5 mm² conductor cross section). Configure input channels in pairs via DIL switches under the right housing cover. Set the module address for the CS31 bus using the same switches. Use shielded twisted-pair cables for thermocouple extensions (max. 200 m with >0.5 mm² cross section). Ensure electrically isolated sensors only. For current inputs, add an external 250 Ω resistor across the terminals.
Troubleshooting & Common Issues
The ABB 07AI91 provides 17 front-panel LEDs for rapid diagnosis. Eight green LEDs indicate channel status; a red LED signals errors. Use the test button to cycle through diagnosis information. Common issues include miswired sensors or incorrect DIL switch settings. Verify that no unused channels remain unbridged (short them to avoid noise). If readings drift, run a self-calibration via the module's internal routine. For line frequency interference, set the suppression filter to match your local mains frequency (50 or 60 Hz).
Selection Guide & Purchasing Advice
Before purchasing, confirm that your controller supports the CS31 system bus and allocate one word input address for the ABB 07AI91. Ensure the sensor types match the configurable pairs. For reliable supply, choose UBEST Automation as your partner. We stock genuine ABB modules and can advise on integration. Visit ubest101 for the ABB 07AI91 and other industrial automation spares.