Atlas Copco 8433056445 I/O Expander Error Proofing Module (FNOB)

The Atlas Copco 8433056445 is an I/O expander module, also known as the Error Proofing module (FNOB), designed to augment the digital input/output capabilities of Atlas Copco tightening controllers, such as the Power Focus and Tensor series. This module adds a dedicated set of isolated digital I/O points that can be used for error‑proofing applications—for example, verifying that a part is correctly positioned, detecting the presence of a fastener, or interfacing with operator guidance lights and buttons. By providing additional I/O, the module enables more sophisticated quality assurance and assembly verification without requiring a separate PLC.

Module Features

The FNOB module connects to the host controller via a high‑speed serial interface (SPI or CAN), automatically recognized by the controller’s firmware. It offers a combination of inputs and outputs that are configurable for various signal types. The module is housed in a compact plastic enclosure designed for DIN‑rail mounting, with pluggable terminal blocks for easy wiring. LED indicators on the front provide clear status for each channel.

Technical Specifications

• Supply Voltage: 24 VDC (derived from controller)

• Digital Inputs: 8 isolated, 24 VDC, sink/source selectable

• Digital Outputs: 8 solid‑state, 24 VDC, 0.5 A per channel

• Input Impedance: 3.5 kΩ

• Output Protection: Short‑circuit and overcurrent protected

• Response Time: < 1 ms

• Interface: SPI (dedicated cable to controller)

• Power Consumption: 2 W (typical)

• Operating Temperature: 0 °C to +55 °C

• Protection: IP20

• Dimensions: 105 x 75 x 45 mm

Installation and Configuration

Mounting is on a standard 35 mm DIN‑rail. The module connects to the controller using a supplied ribbon cable. Configuration is performed via the controller’s software (ToolsTalk), where each channel can be assigned a specific function—e.g., start signal, part‑present sensor, OK/NOK indicator, or interlock. The module’s address is automatically assigned, but can be manually set for multi‑module systems.

Error‑Proofing Applications

Typical use cases include: verifying that a component is correctly loaded before tightening, checking that the correct torque socket is installed, interfacing with a barcode reader to ensure the right job, controlling a stack light to guide the operator, and enabling a protective door interlock. The module can also be used to connect external push‑buttons for manual start or abort.

Compatibility

This I/O expander is compatible with all current Atlas Copco controllers that support the FNOB expansion: PF3000, PF4000, PF6000, TC‑4000, and Tensor S4/S7 series. Multiple modules can be cascaded to add up to 64 additional I/O points.

Diagnostics and Status

Each input has a green LED that illuminates when the input is active; each output has a yellow LED when energized. The controller can read the module’s internal diagnostic data, including short‑circuit detection and over‑temperature alerts.

Benefits

By adding dedicated I/O, the FNOB module reduces the complexity of external wiring and eliminates the need for a separate PLC for simple logic. It improves cycle times by reducing communication overhead, and enhances safety by providing direct interlocking.

Maintenance

No routine maintenance required. The module is designed for long‑life operation with no moving parts.

Conclusion

The Atlas Copco 8433056445 I/O expander error‑proofing module is a cost‑effective, easy‑to‑integrate solution for adding quality assurance I/O to tightening systems, enhancing process reliability and operator guidance.