EPI2338-0002 BECKHOFF 8-Channel Configurable Digital I/O IO-Link Box

Product Overview

The EPI2338-0002 (EPI23380002) is an ultra-versatile IO-Link device that provides 8 digital channels, each of which can be independently configured as either an input or an output. Operating as an IO-Link V1.1 Class B device, it is designed for decentralized, cabinet-free installation in demanding industrial environments. The Class B interface is a critical distinction, as it provides an additional, electrically isolated power supply specifically for high-current loads and outputs. This makes the EPI2338-0002 an ideal B2B solution for modular machine building, robotic tooling, and automated production lines where high I/O density and flexible signal direction are required in an IP67-rated footprint.

Hardware Architecture and Class B Integration

The EPI2338-0002 architecture is defined by its "One-Port-Multi-Signal" capability. Each of the 8 channels, accessed via M12 screw-type connectors, can sink or source signals based on the PLC configuration. The module utilizes the high-speed COM3 (230.4 kbaud) data rate to ensure that the process data for all 16 signals (8 inputs + 8 outputs/diagnostics) is updated with minimal latency.

A key technical feature is the IO-Link Class B interface (M12 A-coded). Unlike Class A, which only provides system power, Class B provides a second, isolated power supply ($P24$). This $P24$ supply powers the digital outputs and the sensor supply, ensuring that an electrical fault or short circuit on the output side does not interrupt the IO-Link communication logic ($L+$). Each output can deliver up to 0.5 A, and the module features an adjustable input filter (0 to 20 ms) to accommodate various field sensor types.

Technical Specifications

Technical FAQs

What is the advantage of a Class B IO-Link port for this module?

The Class B port provides an additional set of pins for auxiliary power ($U_2$ or $P24$). This allows the digital outputs and sensor supply to draw power from an isolated source. If a machine's Emergency Stop cuts the peripheral power ($P24$), the module remains "alive" on the network via the $L+$ system power, allowing it to report the status to the controller.

How is the input/output direction determined?

The direction is determined via the IO-Link parameterization. In the engineering tool (like TwinCAT), the user defines whether a specific pin should act as a Type 3 digital input or a 0.5 A digital output. No hardware jumpers are required.

Does this module support short-circuit diagnostics?

Yes. Every channel is individually short-circuit proof. The module can report short-circuit or overload conditions back to the IO-Link master, enabling precise identification of faulty field wiring or failed actuators.

Engineering & Installation Guide

• Wiring for IP67: To maintain the environmental seal, M12 connectors should be tightened to a torque of 0.6 Nm. Unused I/O ports must be closed with M12 protective caps. Use high-quality A-coded M12 cables specifically rated for IO-Link Class B to ensure the $P24$ pins are connected.

• Filter Optimization: For high-speed applications, the input filter can be reduced to 0 ms via IO-Link parameters. However, ensure that the field sensors are high-quality and the cabling is shielded to prevent nuisance triggers from electrical noise.

• Power Planning: The current consumption from $L+$ (system) is typically 100 mA. Ensure the total load from the 8 outputs does not exceed the capacity of your IO-Link Master's Class B port supply (typically limited by the M12 connector's pin rating).

Engineering Advantages

The EPI2338-0002 represents the pinnacle of I/O flexibility. By allowing each port to be configured on the fly, it significantly simplifies spare parts inventory—one module can replace multiple dedicated input or output boxes. Its Type 3 input characteristics ensure compatibility with low-power sensors, while the 0.5 A outputs are robust enough to drive solenoids, relays, and indicators directly. With its -25 to +60 Celsius operating range and high shock/vibration resistance, the EPI2338-0002 provides a resilient, software-configurable I/O solution for the most modern B2B industrial automation architectures.