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9.2. Monitoring a Contact
In this application, the PLS will monitor a switch or contact.
When the contact closes (signal goes low) for more than one
minute, the PLS will automatically switch module 1 to the "B"
position. Later, if the contact returns to the open position, the
PLS will return circuit 1 to the "A" position.
Note: This example could also be used to monitor a
contact or switch that is normally closed. To
automatically switch A/B circuits when a contact is
opened, use item 3 (Switch if Level) in the Monitor
Mode Parameters Menu (Section 5.7.2) to select the
"1 - High" option.
1. Connect Line from Data Device: Connect a line from the
contact to the Monitor Input Connector as shown in
Figure 9.3.
2. Set Monitor Selector Switch: Locate the Monitor
Selector Switch on the PLS back panel. Slide the switch to
the "CONTACT" position.
9-3
Section 9: Application Examples
Figure 9.3: Monitoring a Switch or Relay