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In general, to reduce the risk of accepting a false PSO signal, the PSO receiver should be set
up to receive only one code. Multiple codes can be used when used in conjunction with a
transmitter that is set to Dynamic mode.
A unique drop delay can be set for each code. If a drop delay is set, the PSO receiver will not
declare the circuit occupied until the drop delay has expired. To prevent a loss of shunt causing
a short warning time, the PSO receiver will not allow the drop delay to be reapplied until the
PSO receiver has been continuously unoccupied for 30 sec. If Advance Preemption is used, the
advance preemption timer will start once the drop delay has expired, see section 0.
PSO 1 Appr 1 Act Occ is available in the System Outputs, this represents the actual occupancy
of the PSO 1 RX 1 track circuit without the drop delay. This de-energizes as soon as the track
circuit is occupied without waiting for the drop delay to expire.
Figure 10-19 PSO Codes
10-23
SIG-00-22-02
JUNE 2022 (Revised September 2022)
Version : B.1
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