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258 IOLAN SDS/SCS/STS/MDC User’s Guide, Version 4.0
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 on page 382 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 on page 249 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.
IOLAN
perle
Monitoring
Application
Network
Industrial
Freezers
Digital I/O
Input
Input
Output
Output
D4