Section 9: Application Examples
Figure 9.3: Monitoring a Switch or Relay
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.
