Справочник Пользователя для Perle Systems 5500161-40

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Channels

Relay channels can open or close a contact for a higher voltage circuit using a lower level control 
voltage. The Relay output channels work as a physical on/off switch, and are used to drive higher 
voltage devices with a lower controlling voltage.

You can configure the following Relay output channel options:

z

You can choose to manually activate/deactivate the Relay output.

z

You can choose to manually activate/deactivate the Relay output and then specify that the Relay 
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 Relay 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 active or inactivate the Relay output when 
the failsafe timer is triggered (see 

 for more 

information). 

In an industrial freezer warehouse, the IOLAN A4R2 is used to monitor humidity transducers, which 
are used to help prevent freezer burn. If the humidity reaches a certain percentage (monitored by an 
Analog channel) a syslog message is sent to the Monitoring Application, causing the Relay channel 
to activate an internal freezer dehumidifier. The Relay channel is deactivated when the Analog 
channel sends a clear syslog message to the Monitoring Application and the Relay channel is 
deactivated.

Network