Product Description:

The IE2401 is a digital I/O extension box manufactured by Beckhoff within the IE Extension Box Units series. Designed for machine-mounted installation, the unit provides localized collection of sensor states and direct switching of actuators, reducing cabinet wiring. It links field-level devices to the controller through a pluggable communication backbone while keeping the I/O channels powered at the system supply voltage used throughout industrial automation.

I/O connections are presented on a pair of compact connectors that share the same industrial form factor. The signal sockets use an M8 screw-in interface with a 4-pin layout, so standard sensor cables can be used without adapters. Internally, the module offers 8 digital inputs and eight transistor outputs, giving the controller access to sensor signals and actuator commands during each communication cycle. Each output stage can drive a load of up to 0.5 A, and the sensor supply is limited to 0.5 A per channel to protect the module against excessive current. All channels share a rated load bus of 24 VDC, which is fed through a dedicated M8 power connector. The downstream connection passes through a single M8 socket, allowing additional extension boxes to be connected in a daisy chain.

Each input draws only 6 mA from the connected sensor and passes through a hardware debounce period of 3.0 ms to suppress contact chatter. The circuitry is separated from the communication core by control-to-fieldbus isolation, while reverse-polarity protection guards against accidental reversal of the 24 V supply. Continuous on-state consumption of the outputs is only 20 mA per channel, which helps limit internal power use during operation. The output design also limits fault energy by tripping at a short-circuit threshold of 1.5 A. These protections support operation with frequently connected field devices and changing actuator loads on machine-mounted installations.