Perle Systems Sds4 Manual de usuario descargar pdf (Pagina 272)

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101

271

Channels

Digital Input

Overview

When the channel is set for digital input, it monitors voltage or current. Note that the internal jumpers

must match the software setting and must be set to Input, which is the default; see

Digital I/O

Module to find out how to set the internal jumpers.

Functionality

The Digital input channels allow you to configure the following options:

z You can choose to remember the last state change, or latch, that occurred. Your options are to

latch (remember) when the state changes from inactive to active or active to inactive.

z You can choose to invert the signal, which is useful if your sensor is wired in such a way that

closed is actually inactive, whereas closed is normally considered active.

z You can also configure an alarm trigger and clear mode based on whether the Digital input is

active or inactive, sending an email, syslog message, and/or SNMP trap when the alarm is

triggered or cleared.

In an industrial freezer warehouse example, a D4 is used to monitor the open door sensor, so that

every time a freezer door is opened, an alarm is triggered and a syslog message is sent to a syslog

server, where the monitoring application notes the time.

IOLAN

perle

Monitoring

Application

Network

Industrial

Freezers

Input

Digital I/O

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