96-Channel Bidirectional Digital Input Module Reference Design for PLC

1 января 2018

This reference design is a compact implementation of 96 isolated digital input channels using the ISO1212, an isolated digital input receiver. This design shows the current limit feature of the ISO1212 device which has better thermal performance than traditional optocoupler solutions. This design makes a digital input board with multiple channels more compact and decreases board temperature (less than 50°C). A MUX and decoder with the ISO1212 device decreases the number of pins of the microcontroller from 96 to 8. The design was tested with 100-kHz input signals (200- kbit) per channel. The design uses less than 7.3 W of input power which results in less heat dissipation. All signals are designed to withstand ESD, EFT, and surge events according to IEC6100-4.

Особенности

96-channel bidirectional digital input module Voltage Inputs: 24-VDC Range, Limited to 3.1 mAPer Channel Compact and Low Temperature Rise (< 50°C at 1hour) Design with all 96 channels on Serial Output Option Tested to 0.5 kV, 42Ω IEC 61000-4-5 surge test for industrial signal lines