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Channels
Digital Output
Overview
When the channel is set for digital output, either voltage is applied to the channel or the channel is
grounded. Note that the internal jumpers must match the software setting and must be set to Output
(by default, they are set to Input); see
Digital I/O Module to find out how to set the internal jumpers.
Functionality
The Digital output channels support three types of Digital output: sink (voltage), source (ground), and
sink and source (apply voltage or ground). For the output type, you can configure the following
options:
z You can choose to manually activate/deactivate the Digital output.
z You can choose to manually activate/deactivate the Digital output and then specify that the
Digital output will either pulse (you get to specify the active and inactive pulse times)
continuously or for a specified number of pulse counts.
z You can choose to manually activate/deactivate the Digital output and then specify a delay before
the output goes from inactive to active or active to inactive.
z You can also specify a failsafe action that can either activate or inactivate the Digital output
when the failsafe timer is triggered (see
Failsafe Timer Functionality for more information).
In an industrial freezer warehouse, the IOLAN D4 is used to monitor the freezer doors. When one of
the industrial freezer doors are left open for more than five minutes, the Monitoring Application
(using the Perle API) starts the Digital output sink, causing the strobe light on top of the offending
freezer to activate.
Auto Clear Mode When enabled, automatically clears the alarm when the trigger condition
changes; for example, if the
Trigger is Inactive and the alarm is triggered, once
the input becomes active again, the alarm will automatically be cleared
Default: Enabled
Manual Clear
Mode
When enabled, a triggered alarm must be manually cleared.
Default: Disabled
Syslog When enabled, sends a message to syslog when an alarm is triggered or
cleared. The syslog entry includes the severity level and the value that caused
the alarm to trigger or clear. The syslog message is associated with
Level
Critical
.
Default: Disabled
SNMP When enabled, sends an SNMP trap when an alarm is triggered or cleared. The
trap consists of the severity level and whether the alarm was triggered or
cleared.
Default: Disabled