Product Overview

The 07AI91 is a high-performance ABB analog input module designed for remote use on the CS31 system bus. This module provides 8 analog input channels configurable for temperature sensors or voltage inputs, delivering precise measurement and reliable diagnostics for industrial automation and oil/gas applications.

Technical Specifications Analysis

The 07AI91 operates on a rated supply voltage of 24 V DC with a maximum current consumption of 0.15 A and maximum power dissipation of 3 W. It features 8 analog input channels, each configurable in pairs for ±10 V, ±5 V, ±500 mV, ±50 mV voltage ranges, or for Pt100/Pt1000 RTDs and thermocouples types J, K, and S with linearization. The module supports 4...20 mA current inputs using an external 250 Ω resistor. Line frequency suppression can be set to 50 Hz, 60 Hz, or none, with a software filter of 20.0 ms at 50 Hz and 16.7 ms at 60 Hz. The permissible input overvoltage is max. ±30 V, and the updating period per channel is typ. 100 ms with suppression and typ. 30 ms without. The module offers electrical isolation from the CS31 system bus and includes 17 LEDs for operation and error display.

Application Scenarios & Usage Methods

In oil and gas refineries, the 07AI91 monitors temperature from thermocouples (type J, K, S) and RTDs (Pt100, Pt1000) in distillation columns and heat exchangers, ensuring process safety. For water treatment plants, it reads 4...20 mA signals from pressure transmitters using an external shunt. In manufacturing lines, it captures ±10 V analog signals from speed sensors. Configure channels via DIL switches and connect sensors using shielded cables up to 50 m in parallel or 200 m with two-core shielded cable.

Installation Guide & Packing List

Mount the module on a DIN rail (15 mm high) per DIN EN 50022-35 or use four M4 screws. Wire using removable terminal blocks with screw-type terminals, max. conductor cross section 2.5 mm². Ensure 24 V DC power with reverse polarity protection. The package includes the ABB 07AI91 analog input module, removable terminal blocks, and a product manual.

Purchasing Advice

When selecting the 07AI91, verify your sensor types and input ranges match the module's configurable options: voltage (±10 V, ±5 V, ±500 mV, ±50 mV), current (4...20 mA with external shunt), Pt100/Pt1000, or thermocouples J, K, S. For reliable supply and fast delivery, order from PetroPartsOnline, your trusted source for industrial automation and oil/gas parts.

Repair & Maintenance Tips

Regularly inspect the 17 front-panel LEDs for error indications. Keep the module within its permissible operating temperature range of 0...55 °C. Clean connectors with dry compressed air and ensure all terminal blocks are securely fastened. Avoid exposure to excessive vibration or moisture. Perform periodic self-calibration via the diagnosis functions.

Frequently Asked Questions (FAQs)

Q: What is the supply voltage for the 07AI91?

A: The rated supply voltage is 24 V DC, with protection against reversed polarity.

Q: How many analog inputs does the 07AI91 have?

A: It has 8 analog input channels, configurable in pairs for temperature sensors or voltage inputs.

Q: Can the 07AI91 measure 4...20 mA signals?

A: Yes, using an external 250 Ω resistor across the input terminals, it can measure 4...20 mA or 0...20 mA.

Q: What is the maximum input overvoltage allowed?

A: The permissible input overvoltage is max. ±30 V.

Q: How do I configure the module address and input channels?

A: Use the DIL switches located under the right housing cover for addressing and configuration.