Product Core Brief

• Model: GJR5252300R0101 / 07AC91
• Brand: ABB
• Series: Advant Controller 31 (AC31)
• Core Function: Provides configurable analog signal interfacing over the CS31 bus.
• Type: Distributed analog I/O module
• Key Specs: 16 configurable analog I/Os; 24 V DC supply; 12-bit + sign resolution in 8AI/8AO mode
• Condition: Verify stock condition before purchase; request confirmation for New Original (New Surplus) or Refurbished (tested)
• Availability: Legacy AC31 component; limited market availability should be expected

Product Introduction

ABB 07AC91, order number GJR5252300R0101, is a distributed analog I/O module for ABB AC31 PLC systems. It connects field voltage and current signals to the controller through the electrically isolated CS31 bus.

The unit supports two operating modes: eight analog inputs plus eight analog outputs at 12-bit resolution, or 16 channels configured by pairs at 8-bit resolution. It accepts −10 to +10 V, 0 to 20 mA, and 4 to 20 mA signals. ABB identifies it as a CS31 slave with 24 V DC supply.

The ABB product data identifies 07AC91 as a CS31 slave and lists the two selectable analog operating modes, 24 V DC supply, IP20 protection, and DIN-rail mounting.

Treat conflicting reseller specifications carefully. Some listings describe the unit as an eight-channel module or claim AC800M, PROFIBUS DP, Modbus RTU, 16-bit conversion, or −20 to +60 °C operation. Those claims do not match the ABB product data reviewed here. Verify the OEM datasheet and existing AC31 configuration before ordering.

For procurement, request these items:

• Stock condition and photographs of the nameplate.
• Serial number and OEM packing-list traceability.
• Firmware or hardware revision, if recorded.
• Included terminal blocks and mounting accessories.
• Warranty duration and return terms.
• Tested-unit report if the part is refurbished.
• Delivery location, quoted Incoterm, and lead time.