ELPRO 805U-E User Manual download pdf (Page 17)

Chapter Two Installation

Page 17 © April 2007

2.5 Discrete (Digital) Input/Output

The 805U-E has one on-board discrete/digital I/O channel. This channel can act as either a

discrete input or discrete output. It can be monitored, or set remotely, or alternatively used to

output a communications alarm status.

If used as an “input”, the I/O channel is suitable for voltage free contacts (such as

mechanical switches) or NPN transistor devices (such as electronic proximity switches). PNP

transistor devices are not suitable. Contact wetting current of approximately 5mA is

provided to maintain reliable operation of driving relays.

The digital input is connected between the "DIO" terminal and common "COM". The I/O

circuit includes a LED indicator which is lit when the digital input is active, that is, when the

input circuit is closed. Provided the resistance of the switching device is less than 200 ohms,

the device will be able to activate the digital input.

The I/O channel may also be used as a discrete output. The digital outputs are transistor

switched DC signals, FET output to common rated at 30VDC 500 mA.

The output circuit is connected to the "DIO" terminal. The digital output circuit includes a

LED indicator which is lit when the digital output is active.

DIO

GND

805U-E

Voltage

free

contact input

Load

Max 30VDC

0.5A

DIO

GND

805U-E

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ELPRO 805U-E User Manual Page 17