EKE-Trainnet

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Four 4...20 mA analogue inputs grouped in two groups

Two 4...20 mA analogue outputs

I/O connections either at rear or at front

Input and output channel filtering

Self-diagnostics

I/O state and module status indicators SDLC type serial bus interface

The AIO module is an intelligent analogue

I/O interface module that can be located

in the Coach Computer or distributed

within the coach. The module has its own

8-bit embedded processor and a Vehicle

Bus interface.

The module’s 4 analogue input channels

are separated into two groups, and the

optional output channels form a third

group. Each group provides its own voltage

and return signals for external I/O

circuits.

The module’s embedded microprocessor

controls the inputs and outputs. Each input

channel has parameters for calibration

(factory set). For the Coach Computer

the module has an SDLC-type Vehicle

Bus interface.

The resolution of the input A/D conversion is 12 bits, and the cut-off frequency of the hard-ware low pass filter is 100 Hz. The board’s software runs average type filtering, the typical length of which is 16 samples at a sample rate of 40 ms, thus providing a cut-off frequency of approximately 1 Hz.

Analogue outputs. The type of the analogue outputs is current loop (4...20mA).

The resolution of the output A/D conversion is 12 bits.

Self diagnostics. The module has normal power-on self-tests for memories.

I/O indicators. The AIO module has LED bar indicators for input and output channel levels.

I/O connections. The module has two configurations, one configuration for I/O connections at rear and the other for I/O connections at front. Both configurations have a similar I/O functionality, but the front configuration doesn’t have the module status indicator or I/O indicator LEDs.

The EKE-Trainnet® AIO module

EKE-Trainnet® AIO module block diagram

EKE-Trainnet® is a registered trademark of EKE-Electronics Ltd.

All data subject to change without notice.

INPUT POWER: 5 VDC ± 5% (1000 mA max., 250 mA typ.)

MTBF: 400 000h (25°C)

TEMPERATURE RANGE: Operational -40°C … +70°C

I/O CONNECTOR: DIN41612-D (at rear) or DIN41612-F (at front)

I/O BUS: RS485, SDLC/Modbus 375 kbps

TEST INTERFACE: RS232C, asynchronous 19.200 bps

Input type: Current loop input (4 ... 20 mA)

Input loop supply voltage: 8...36 VDC

Input accuracy: ± 0.5% of full scale (12 bit)

Cut-off frequency: 1 Hz (software sampling)

Output type: Current loop input (4 ... 20 mA)

Output loop supply voltage: 8...36 VDC

Output accuracy: ± 0.5% of full scale (12 bit)

Refresh rate: 40 ms