Digital Input Output Module
The EKE-Trainnet® Digital Input/Output Module (DIO) provides a standard interface for managing digital input and output signals.
It receives digital signals through its input channels and delivers them to the train computer’s Central Processing Unit (CPU) module for processing.
The EKE-Trainnet® DIO receives instructions from the train computer’s CPU module and sends digital signals to the subsystems accordingly via its output channels. Separate channels are provided for frequency measurements (can be used for tachometer inputs). The EKE-Trainnet® DIO module can be used as a part of an EKE-Trainnet® Train Control and Management System, Vehicle Control Unit or Event Recorder. Alternatively, the EKE-Trainnet® DIO can be fitted into the EKE-Trainnet® Remote I/O System.
Key Features
The EKE-Trainnet® DIO features 24 dedicated input channels and 8 channels that can be configured as either inputs or outputs. The DIO2908B and DIO2378A models allow up to four outputs to be connected in parallel for increased current capacity. Additionally, the DIO2378A includes 2 frequency input channels, while the DIO1823A offers 2 high-speed input channels.
The module features a 32-bit embedded processor that performs diagnostics and alerts the train computer’s CPU if input values are unreliable. Each input channel includes a common test circuit for real-time diagnostics, both at power-on and during normal operation. The train computer’s CPU can access the input and output states, as well as configuration parameters such as wetting current and threshold levels.
One special feature of the EKE-Trainnet® DIO module is to support the UIC-556 sleep mode. The DIO can remain active with WTB modules and provide local inauguration and battery voltage monitoring.
Two separate group voltages with common ground allow a split behind two circuit breakers, or a mixed voltage system. Input and Input/Output channels are split evenly between group voltage 1 and 2. Please note that the groups are not isolated from each other.
The module includes emergency output short circuit protection. If the output current exceeds its maximum value, the short circuit protection shuts down the output. The status of this protection is communicated to the train computer’s CPU. In the event of communication failure, the output channel defaults to an emergency state defined in the application software, with individual settings for each channel.
The module development is based on the railway standards EN 50126, EN 50128 and EN 50129 in accordance with safety integrity level SIL 2. A non-SIL version of the module is also available.
