07AI91 is an 8-channel high-precision analog input module of ABB Advant AC31 and Procontic 07 series. Its part number is GJR5251600R0202. Manufactured in Sweden, this module works with the CS31 system bus and serves as a remote I/O unit. It is mainly used to collect analog signals such as temperature, pressure, liquid level and flow, and is compatible with various sensors and standard industrial signals. It is widely applied for signal collection, daily maintenance and system expansion of legacy ABB DCS and PLC systems including AC31, Advant OCS and 800xA. This model has been discontinued. Currently, the available products on the market are mainly new old stock, used parts and refurbished units.

07 means the module belongs to the ABB Procontic 07 series I/O module system. AI stands for analog input module. 91 is the specification code, representing an 8-channel isolated module with 12-bit and 16-bit dual resolution and CS31 bus compatibility. Modules without letter suffix are standard basic hardware versions.

The module is equipped with 8 fully independent and galvanically isolated analog input channels. It supports multiple signal types configured by software, including ±10V, 0-10V, 0-5V, 0-20mA and 4-20mA. It is also compatible with J, K, S, T, E, N, R, B type thermocouples and Pt100, Pt500, Ni100, Cu100 RTD sensors. It features 12-bit standard resolution and 16-bit high-precision resolution. The overall accuracy reaches ±0.1% full scale at 25 degrees Celsius. The isolation voltage between channels is 1500V AC, and the isolation voltage between channel and ground is 2500V AC. The module adopts 24VDC power supply with an operating voltage range from 19.2V to 30V, and the total power consumption is no more than 8 watts. It adopts standard single-slot structure and DIN rail mounting. The module weight is approximately 0.48 kilograms. The operating temperature ranges from -20 degrees Celsius to 70 degrees Celsius, and the relative humidity is 10% to 90% without condensation.

The gold finger connector on the rear side connects to the CS31 system bus, and galvanic isolation is designed between the bus and internal circuits. A detachable terminal block is arranged on the front panel, which contains 24VDC power terminals, grounding terminals and terminals for 8 analog input channels. Multiple LED indicators are provided to display the status of power supply, communication, fault and each channel. The module address and signal range are set via onboard DIL switches, and all functional parameters are uniformly configured by the upper host system.

Eight isolated input channels adapt to voltage, current, thermocouple and RTD signal types to meet diverse on-site collection demands. Users can switch between 12-bit and 16-bit resolution according to actual requirements to balance measurement accuracy and response speed. Reliable galvanic isolation effectively suppresses electromagnetic interference in industrial environments and ensures stable signal collection. Built-in self-diagnosis function works with status indicators to quickly locate faults of channels, wiring and communication. It supports hot swapping on CS31 bus, so the module can be replaced without shutting down the whole system.

It is used for analog signal collection of legacy ABB AC31, 800xA and Advant OCS control systems. It is widely deployed in process industries such as chemical industry, metallurgy, water treatment, papermaking and HVAC. It can be used as remote I/O substation to centrally collect signals from multiple on-site sensors.

Cut off the power supply before wiring operation, and separate strong current cables from weak current cables to avoid interference. Clean dust on the module and terminals regularly, and check the tightness of wiring terminals to prevent poor contact. Keep the operating environment ventilated and dry, and stay away from strong interference sources such as frequency converters and high-power motors. When abnormal conditions occur, troubleshoot in the sequence of power supply, wiring, load equipment and system configuration. Do not disassemble the module without authorization. Disconnect the power supply and take dust-proof and moisture-proof measures when the equipment is out of service for a long time.