ABB 07AC91 GJR5252300R0101 Advant Controller 31 Analog Module
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Product Information
The ABB 07AC91 (part number GJR5252300R0101) is a mixed analog input and output expansion module within the ABB Advant Controller 31 product family. Operating as a remote distributed I/O slave unit, this module bridges field process signals with the central processor over an RS-485 CS31 fieldbus connection. The device operates on a nominal 24 V DC power supply with an acceptable input voltage range of 18 V DC to 30 V DC. It features 8 multi-function analog input channels capable of handling bipolar voltage (+/-10V), unipolar voltage (0..10V), current loops (0..20mA, 4..20mA), resistance temperature detectors (Pt100 and Pt1000), and thermocouples. Additionally, 4 configurable analog output channels support +/-10V, 0..20mA, and 4..20mA output ranges using 12-bit conversion resolution (11-bit plus sign) for precise speed reference and actuator control.
Integrating a spare 07AC91 module into an existing automation line relies on establishing proper network settings and communication over the CS31 bus at 187.5 kbit/s. Node addressing is configured manually using onboard address switches directly on the hardware unit. Operational parameter profiles for individual channels do not need to be loaded manually into the module; instead, the central controller automatically transmits configuration profiles over the fieldbus during system boot. Programming environments such as 907 AC 1131 and 907 PC 331 manage the control project and module settings at the master PLC level. When preparing a spare unit for service replacement, technical support from ABC Industrial Parts can help ensure seamless node integration and configuration transfer.
System status and diagnostics are provided through front-panel LED indicators and central CPU diagnostic flags. A green 24VDC / Supply LED indicates power supply health, while the green CS31 / Bus LED monitors active fieldbus communication, flashing if a bus fault or configuration mismatch occurs. A red ERR / Error LED signals peripheral errors such as channel overflow, wire break, or short circuit conditions, as well as internal hardware faults. System diagnostics can also be monitored online through 907 AC 1131 software or central CPU error flags (FK1, FK2, and FK3). A constant red error light in the absence of bus communication indicates permanent internal failure. Because internal board-level faults cannot be serviced in the field, sourcing a tested replacement or exchange unit through ABC Industrial Parts provides a fast route to restoring plant operations.
Technical Specifications
| Manufacturer | ABB |
| Part Number | GJR5252300R0101 |
| Model / Type | 07AC91 |
| Product Family | Advant Controller 31 |
| Component Type | Analog Input/Output Module |
| Supply Voltage | 24 V DC |
| Supply Voltage Range | 18 - 30 V DC |
| Analog Input Channels | 8 channels |
| Analog Output Channels | 4 channels |
| Resolution | 12 bit (11 bit + sign) |
| Fieldbus Protocol | CS31 |
| Interface Standard | RS-485 |
| Baud Rate | 187.5 kbit/s |
Programming and Configuration
Configuration for the ABB 07AC91 module is performed within the Advant Controller 31 software environment. Engineers define channel ranges, scaling parameters, and signal types using 907 AC 1131 or 907 PC 331 software at the central controller level.
Hardware setup on the module itself involves selecting the correct fieldbus node address using onboard address switches prior to commissioning. During initial boot, the central CPU transfers parameter profiles directly across the CS31 bus to the 07AC91, requiring no direct parameter entry on the module hardware.
Communication and System Integration
The 07AC91 functions as a remote slave unit on the proprietary ABB CS31 fieldbus system. Communication utilizes an RS-485 physical interface operating at a fixed transfer rate of 187.5 kbit/s, enabling reliable data transfer over distributed plant networks.
This communication architecture allows diverse analog field signals—including temperature measurements from RTDs and thermocouples as well as analog speed references—to be collected centrally across legacy Advant Controller 31 automation networks.
Diagnostics and Status Indication
The module contains front-panel LED indicators for immediate local visual inspection of operating status, bus traffic, and hardware or peripheral errors.
In addition to visual LEDs, diagnostic flags (FK1, FK2, and FK3) inside the central CPU track module conditions. Online diagnostics conducted via 907 AC 1131 software allow maintenance staff to identify field errors such as sensor wire breaks, short circuits, or out-of-range signal overflow.
Status LED Indicators
| LED | Color/Status | Meaning |
|---|---|---|
| 24VDC / Supply | Green - Solid | 24 V DC supply voltage present; off indicates loss of power or internal power breakdown |
| CS31 / Bus | Green - Solid / Flashing | Green indicates active CS31 bus communication; flashing or off indicates bus communication loss or configuration mismatch |
| ERR / Error | Red - Solid / Flashing | Red indicates peripheral error (wire break, short circuit, channel range overflow) or internal fault; constant red without bus traffic indicates permanent internal failure |
Replacement and Spare Part Considerations
When swapping out a faulty ABB 07AC91 module, ensure the replacement unit's onboard address switches match the CS31 fieldbus node address of the original device before applying 24 V DC power.
Because channel parameters are maintained in the master PLC project and automatically sent to the module during central controller boot-up, no direct parameter upload to the spare hardware is required. Verifying physical terminal wiring for the 8 analog inputs and 4 analog outputs completes the commissioning process.
Frequently Asked Questions
What power supply voltage does the ABB 07AC91 module require?
The module requires a nominal power supply voltage of 24 V DC, with an operational voltage range from 18 V DC to 30 V DC.
How are analog input and output channels configured on a replacement unit?
Channel parameter profiles are automatically pushed to the 07AC91 module by the central controller over the CS31 bus during system boot. You only need to set the node address using the hardware address switches.
Which input signal types are supported by the 07AC91?
The 8 multi-function input channels support bipolar voltage (+/-10V), unipolar voltage (0..10V), current signals (0..20mA, 4..20mA), RTD sensors (Pt100, Pt1000), and thermocouples.
What communication protocol and speed does the module use?
It communicates over an RS-485 CS31 fieldbus network at a fixed baud rate of 187.5 kbit/s.
Which software tools support programming and online diagnostics for this module?
The module is supported by 907 AC 1131 programming software and 907 PC 331 software for system programming and online diagnostic monitoring.
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Specific firmware and hardware versions
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Disclaimer:
We are not an authorised distributor of ABB.
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