EPP2338-0002 BECKHOFF EtherCAT P Box 8-Channel Digital I/O

Product Overview

The EPP2338-0002 (EPP23380002) is an ultra-compact, machine-mountable I/O solution designed for decentralized automation without the need for a control cabinet. Utilizing EtherCAT P technology, this module combines high-speed communication and power (system and peripheral) into a single, specialized M8 P-coded cable. With 8 flexible digital channels, each configurable as either an input or an output, the EPP2338-0002 is the ideal interface for high-speed robotics, automated sorting systems, and outdoor machinery. Its IP67-rated zinc die-cast housing ensures complete protection against dust and high-pressure water jets, making it a "mount-anywhere" core component for modern Industry 4.0 architectures.

One-Cable Automation & Signal Versatility

The EPP2338-0002 features a highly adaptive internal logic that supports EN 61131-2, type 1/3 inputs. With a ultra-fast 10 µs input filter, it can capture high-frequency trigger signals that standard PLC modules often miss. When configured as outputs, each of the 8 channels can drive up to 0.5 A, supporting ohmic, inductive, and lamp loads. The integrated short-circuit protection for both sensor supply and individual output channels ensures that a localized wiring fault does not compromise the entire EtherCAT P segment. This "smart" power management allows the module to maintain a typical auxiliary power consumption of only 20 mA while delivering high-torque performance to field actuators.

Technical Specifications

Engineering FAQ & Field Performance

What is the benefit of the "P-coded" M8 connector?

The P-coding is a physical keying standard that prevents the accidental connection of standard EtherCAT cables to EtherCAT P ports. This safeguard is essential because EtherCAT P carries both the 24 VDC system/sensor supply ($U_S$) and the 24 VDC peripheral voltage for actuators ($U_P$) on the same 4-wire shielded cable used for data.

How does the configurable I/O work in TwinCAT?

In the TwinCAT System Manager, each channel of the EPP2338-0002 can be mapped as an Input or an Output. The hardware automatically detects the direction based on the process image mapping. For example, if you link a channel to a PLC output variable, the module enables the 0.5 A power transistor for that specific M12 pin.

Is this module suitable for high-vibration tool-changers?

Yes. The module is tested according to EN 60068-2-6 and is fully encapsulated. The M8 and M12 screw-type connectors provide a gas-tight, vibration-resistant connection that far exceeds the reliability of traditional spring or screw terminals found in cabinets.

Engineering & Installation Guide

• EtherCAT P Segments: When daisy-chaining multiple EPP modules, calculate the total current draw for both $U_S$ and $U_P$. If the voltage drop exceeds the 24 VDC (-15 percent / +20 percent) tolerance at the end of the chain, an EP9214 or EP9224 power feeder must be inserted to refresh the power levels.

• M12 Connector Torquing: To maintain the IP67 rating, all M12 and M8 connectors must be tightened with a calibrated torque wrench (typically 0.6 Nm for M12). Use protective caps on any unused sockets to prevent moisture ingress and oxidation of the contacts.

• Inductive Load Handling: While the outputs are short-circuit proof, when switching high-inductance loads (such as large solenoid valves), ensure that the internal flyback diodes are sufficient for your cycle rate. For extremely high-frequency switching, external quenching circuits may be used to extend the module’s lifespan.

Engineering Advantages

The BECKHOFF EPP2338-0002 eliminates the need for intermediate terminal boxes, significantly reducing wiring complexity and material costs. Its ability to operate in sub-zero temperatures (-25 Celsius) and withstand heavy mechanical shock makes it a premier choice for mobile equipment and AGVs (Automated Guided Vehicles). By leveraging the 500 V electrical isolation between the EtherCAT P bus and the field level, it ensures that electromagnetic noise from large motors does not interfere with the master controller’s data integrity.