Product Introduction
When precision analog signal handling is critical in industrial automation, the ABB 07 AC 91 terminal blocks module delivers reliable performance. Part of the Advant Controller 31 family, this remote module connects to the CS31 system bus and provides 16 analog input/output channels. It supports two operating modes: 12-bit resolution with 8 inputs and 8 outputs individually configurable for ±10 V or 0...20 mA, or 8-bit resolution with up to 16 channels configurable in pairs for 0...10 V or 0...20 mA. Configuration is set via DIL switches, and the module uses up to eight input words and eight output words on the bus.
Technical Specifications Breakdown
The ABB 07 AC 91 operates on a rated supply voltage of 24 V DC, with a maximum current consumption of 0.2 A and maximum power dissipation of 5 W. It includes protection against reversed polarity of the power connection. The permissible temperature range during operation is 0...55 °C. The module features one binary input as an enabling input for analog outputs, and the number of analog input and output channels is 8 or 16 depending on the operating mode. Electrical isolation is provided between the CS31 system bus interface and the rest of the unit, as well as for the binary input. The module has a total of 17 LEDs for operation and error displays.
Industry Applications
In process control systems, the ABB 07 AC 91 excels at converting analog signals from sensors (e.g., temperature, pressure, flow) into digital data for the PLC. For example, in a chemical plant, eight input channels can monitor 4...20 mA current loops from transmitters, while eight output channels drive valve actuators with ±10 V signals. The module's 12-bit resolution (5 mV for ±10 V, 5 µA for 0...20 mA) ensures accurate measurement and control. In manufacturing, the 8-bit mode allows cost-effective monitoring of up to 16 simple analog signals, such as level sensors, with 40 mV resolution.
Installation & Setup Guidance
Mount the ABB 07 AC 91 on a DIN rail according to DIN EN 50022-35, 15 mm deep, positioned centrally between the upper and lower edges of the module. Alternatively, use four M4 screws for mounting. Wiring is done via removable screw-type terminal blocks: supply terminals and CS31 system bus accept max. 1 x 2.5 mm² or max. 2 x 1.5 mm²; all other terminals accept max. 1 x 1.5 mm². Install the module vertically with connector terminals pointing upward and downward. Ensure natural convection cooling is not blocked by cable ducts or other components. The analog cables should be two-core shielded with cross-section > 0.5 mm²; maximum cable length is 100 m.
Maintenance & Reliability
Regular inspection of the ABB 07 AC 91 is recommended to ensure reliable operation. Check the 17 LEDs for error indications and verify that the enabling input (binary 1 signal at 24 V) is present for analog output activation. The module's self-protecting current input automatically shuts off if current is too high and attempts re-activation every second, reducing downtime. Operating within the 0...55 °C range and ensuring clean power (24 V DC) will extend service life. Periodic verification of DIL switch settings and terminal block tightness helps maintain signal integrity.
Compatibility & Integration
The ABB 07 AC 91 is designed for the CS31 system bus, using the EIA RS-485 interface standard with electrical isolation from the rest of the unit. It integrates seamlessly with Advant Controller 31 PLCs. The module supports two operating modes: 12-bit (8 inputs + 8 outputs, individually configurable) and 8-bit (up to 16 channels, configurable in pairs). The PLC offers an interconnection element ANAI4_20 for measuring 4...20 mA signals. This compatibility makes it a drop-in solution for expanding analog I/O capacity in existing CS31 networks.
Selection Guide & Purchasing Advice
Before ordering the ABB 07 AC 91, verify your system's CS31 bus compatibility and required operating mode. The module comes with one 2-pole, one 3-pole, one 5-pole, and four 8-pole terminal blocks. Ensure your DIN rail or screw mounting setup matches the 120 x 140 x 85 mm dimensions and 450 g weight. For current lifecycle status and availability, contact SpareTechPLC, your reliable source for industrial automation parts. We offer genuine ABB modules with fast shipping and expert support.
Frequently Asked Questions
Q: What is the resolution of the ABB 07 AC 91 in 12-bit mode?
A: In 12-bit mode, the resolution is 5 mV for ±10 V range (11 bit plus sign) and 5 µA for 0...20 mA range (12 bit without sign).
Q: How many analog channels can the 07 AC 91 handle?
A: It supports 8 input and 8 output channels in 12-bit mode, or up to 16 channels (configurable in pairs) in 8-bit mode.
Q: What is the maximum analog cable length?
A: The maximum length for two-core shielded analog cables with cross-section > 0.5 mm² is 100 m.
Q: Does the module include reverse polarity protection?
A: Yes, the ABB 07 AC 91 has protection against reversed polarity of the power connection.
Q: What is the power consumption of the 07 AC 91?
A: Maximum current consumption is 0.2 A, and maximum power dissipation is 5 W at 24 V DC.
