SMART I/O User’s Manual
©1996 PEP Modular Computers GmbH
March 12, 1996
Page 4 - 5
4
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/90
µ
s
: 35V
: 2ms (approx.)
: 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
