SM-1D1.0032 - Ansaldo STS

Operation• A Sleep Mode board – controls the power for the cardfile, interfaces with the radio andMICROTRAX Track board.Additionally, the exact operation of the entire Sleep Mode controlled territory is userprogrammable. Based on the application logic, the units can be customized to wake-up eachtrack circuit based on a radio request at each circuit; or once an end-unit is activated, it can beginthe wake-up process for the entire territory. Either one status can be reported for the entireterritory, or each circuit can report the status via a radio at each location. The MICROLOK IIunit can transmit CLEAR and/or NOT CLEAR track integrity signals to the wayside radio,which will be transmitted back to the locomotive. These features are all specified within theapplication logic.The MICROLOK II Sleep Mode unit can operate with trains traveling in areas without a passingside, in areas with a passing side, and in a user test mode (for troubleshooting purposes).4.2.2. Activation ExampleRADIO #1 RADIO #2 RADIO #3RADIO #4RADIO #5MLK IIAMLK IIBMLK IICMLK IIDMLK IIESMSMSMSMTK #1 TK #2 TK #3 TK #4WEFigure 4-3. System Block Diagram – Traveling West to EastUnder normal circumstances, when a train is not in the area, all of the MICROLOK II units willbe in a low power mode waiting instructions to verify the integrity of the track circuit. Assumingthe train is approaching from the West (see Figure 4-3), as it approaches TK#1, a radio messagefrom the train is sent to Radio #1 instructing MLK II A to check the status of TK#1. The radio1D1.0032, Rev. 1, November 2010 SM6800B 4-5