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SMART I/O User’s Manual

Chapter 4 Digital Modules

4. Digital Modules

4.1 SM-DIN1

4.1.1 Introduction

The SM-DIN1 provides 8 optoisolated 24V DC digital inputs arranged in 6

independent groups with respect to the ground connections. The maximum

input switching frequency is set to 200Hz with the system registering a

logical ‘1’ when the input exceeds 10V. Logical ‘0’ is returned when the

input falls below 8V. A low-pass filter restricts signals exceeding the filter

limit and registers a logical ‘0’ with the system. The user interface is realized

by 8 green LEDs (one per input channel) which illuminate when the input

exceeds 10V DC and a configurable filter on the last channel for INTx

interrupts (where ‘x’ lies between 1 and 4 depending on which slot the

module is located).

4.1.2 Specifications

Isolation 2.5 kV optoisolated from the system

Input

8 Digital Channels (24V) DC ± 10%

6 Independent Groups

Common GND

< 5mA Input Current

Filter set to 200 Hz (5ms)

Overvoltage Protection (rate)

Overvoltage Protection (continuous)

Switch ON Delay

Switch OFF Delay

High Level

Low Level

: 300V/90µs

: 35V

: 2ms (approx.)

: > 10V

: < 8V

Front Panel Green LEDs (ON when Input > 10V)

Options User configurable R-C filter on the

last channel for INTx generation

Power Consumption 5mW (min.), 100mW (max.)

Temperature Range Standard (0°C to +70°C), Extended (-40°C to +85°C)

Module Weight 40g

ID Byte $01, read by the SPI Interface

1 2 ... 88 89 90 91 92 93 94 95 96 97 98 ... 319 320

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Pepper-computer Modular Computers RS485 Bedienungsanleitung Seite 93