Analogue Input Module
The EKE-Trainnet® Analogue Input Module (AIM) converts the analogue signals and makes them available to the train computer’s CPU module.
The EKE-Trainnet® AIM 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® AIM can be fitted into the EKE-Trainnet® Remote Input Output System.
The EKE-Trainnet® AIM provides a standard interface for analogue input signals. Signals can be current (-20…+20mA) and voltage (-10…10V). Separate channels are provided for frequency signal measurements with the capability to measure pulse-width ratio (PWM).
Key Features
The current measurement channels can measure currents between -20 and +20 mA. The module has the capability to supply voltage to external sensors or to supply loop voltage to the current loops. The module’s voltage measurement channels can measure voltages between -10 and +10 V.
The EKE-Trainnet® AIM5250 has 6 current channels, and 6 voltage channels, and 4 frequency input channels in two groups: two for the low-voltage tachometer measurements and two for the high-voltage pulse width modulation measurements.
The module has its own 32-bit embedded processor that uses factory calibration values to convert the measurement value to mV or µA with great accuracy. The embedded processor also implements diagnostics functions and reports to the system CPU module if it suspects that the input values cannot be trusted.
The frequency input channels can measure frequencies up to 16 kHz, period, pulse width, pulse count and rotary decoding with direction indication (compatible with most industry standard tachometers).
The resolution of the input A/D conversion is sign+12 bits, and the cut-off frequency of the hardware low pass filter is 10 Hz. Both current and voltage channels are capable of giving over range indications which can be used for diagnostic purposes.
