Perle Systems SCS, STS manual Digital Input, Monitoring Application, Digital I/O

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 on page 366 to find out how to set the internal jumpers.

Functionality

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

zYou 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.

zYou 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.

zYou 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.

Network

Monitoring

Application

D4Input

perle

Digital I/O

IOLAN

Input

Industrial

Freezers

245