Pepper-computer Modular Computers RS485 Instrukcja Użytkownika Pobierz pdf (Strona 109)

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101

SMART I/O User’s Manual

Chapter 4 Digital Modules

4.2.5 Functional Description

Figure 4.2.5.1: SM-DOUT1 Schematic Diagram

The system interface is low active which means that a logical ‘0’ activates

the LED and optoisolation stage causing the output to switch the 24V Vcc to

power the load.

The driving output device is a Darlington transistor pair protected against

inductive loads by an additional clamp diode. Furthermore, because each

output stage requires three terminals to remain independent and only 14 such

terminals are available, the common Vcc and GND lines have been grouped.

Hence, each pair of outputs is coupled to one Vcc line and to each pair of

Vcc lines is one ground.

Warning !

Individual outputs should not be cascaded as it cannot be guaranteed that

power sharing will be proportional due to the transistor characteristics.

Load

+Vcc (common)

Gnd

LED

Driver

Digital

Output

System

Interface

Output

Stage

System

Interface

User/Output

Interface

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