The ABB 07AI91 (GJR5251600R0202) is an analog input module in ABB's AC31 Distributed I/O family. It is designed for acquiring analog signals from a wide range of industrial sensors and transmitting the data to an AC31 PLC via the CS31 fieldbus. The module is commonly used in process automation, power generation, water treatment, chemical plants, and manufacturing systems.

Key Features

• Model: 07AI91
• Part Number: GJR5251600R0202
• Product Family: AC31 Distributed Automation I/O
• Supply Voltage: 24 V DC
• Communication Interface: CS31 system bus
• Analog Inputs: 8 configurable channels
• Resolution: 12-bit plus sign
• Protection Rating: IP20
• Mounting: Standard 35 mm DIN rail
• Operating Temperature: 0°C to +55°C

Supported Input Types

Each channel can be configured to accept various industrial signal types, including:

• Voltage:
  • ±50 mV
  • ±500 mV
  • ±5 V
  • ±10 V
• Current:
  • 0–20 mA (using an external 250 Ω resistor where applicable)
• Resistance Temperature Detectors (RTDs):
  • Pt100
  • Pt1000
• Thermocouples:
  • Type J
  • Type K
  • Type S

Main Functions

• Collects high-precision analog measurement data.
• Supports direct connection to temperature sensors and process transmitters.
• Provides electrical isolation between the CS31 bus and field signals.
• Performs automatic channel diagnostics and self-calibration.
• LED indicators simplify channel monitoring and fault diagnosis.

Typical Applications

• Industrial process control
• Temperature monitoring systems
• Water and wastewater treatment
• Power plants
• Chemical and petrochemical facilities
• Food and beverage production
• General factory automation

Technical Specifications

The ABB 07AI91 GJR5251600R0202 is a versatile and reliable analog input module that offers flexible support for voltage, current, RTD, and thermocouple measurements. Its robust diagnostics, high measurement accuracy, and seamless integration with ABB AC31 automation systems make it well suited for demanding industrial monitoring and control applications.