Proximity detection and communication mechanism and method
A vital proximity detection mechanism and method for reliably determining and communicating the position of a railroad switch point relative to a normal fixed track and a reverse fixed track, wherein the mechanism includes substantial component redundancy and fault-checking features and otherwise meets promulgated safety standards for vital componentry. The mechanism includes an RF transmitter and remote status indicator unit to allow for remote adjustments of proximity sensors while monitoring the effects of such adjustments.
1. A method of determining and communicating whether a first member is positioned in a first alignment relative to a second member, the method comprising the steps of:
a) sensing with a first sensing device the position of the first member relative to the second member, and generating a first sensor signal corresponding thereto;
b) sensing with a second sensing device the position of the first member relative to the second member, and generating a second sensor signal corresponding thereto;
c) comparing the first and second sensor signals with a first controller device to make a first determination as to whether the first and second sensor signals both indicate that the first and second members are in the first alignment;
d) comparing the first and second sensor signals with a second controller device to make a second determination as to whether the first and second sensor signals both indicate that the first and second members are in the first alignment;
e) testing the first and second sensing devices with the first controller to make a third determination that the first and second sensing devices are functioning properly;
f) testing the first and second sensors with the second controller to make a fourth determination that the first and second sensors are functioning properly;
g) causing a first changing DC power signal to be provided to a first power supply if a first set of selected conditions are satisfied including confirmation from the first determination that the first and second sensor signals both indicate that the first and second members are in the first alignment and the second determination is not inconsistent with the first determination and confirmation from the third determination that the first and second sensors are functioning properly and the fourth determination is not inconsistent with the third determination;
h) causing a second changing DC power signal to be provided to a second power supply if a second set of selected conditions are satisfied including confirmation from the second determination that the first and second sensor signals both indicate that the first and second members are in the first alignment and the first determination is not inconsistent with the second determination and confirmation from the fourth determination that the first and second sensors are functioning properly and the third determination is not inconsistent with the fourth determination;
i) converting the first changing DC power signal to a first AC power signal, and then converting the first AC power signal to a first non-changing DC power signal; and
j) converting the second changing DC power signal to a second AC power signal, and then converting the second AC power signal to a second non-changing DC power signal.
2. The method of claim 1 further comprising the step of using at least one of the first and second DC output signals with a signal controller to cause a signaling device to indicate that the first and second members are in the first alignment.
3. The method as set forth in claim 1 , further including the step of communicating visually a status of the first and second sensing devices.
4. The method as set forth in claim 1 , further including the step of transmitting via an RF signal data indicative of statuses of the first and second sensing devices.
5. The method as set forth in claim 4 , further including the step of receiving and communicating to a user the data transmitted by the RF transmitter, thereby facilitating adjustment of the first and second sensing devices.