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10-20
SIG-00-22-02 JUNE 2022 (Revised September 2022)
Version: B.1
Figure 10-16 PSO Receiver
When the RX1 Enable Used is set to
Yes
, the PSO 1 RX 1 Enable input is available in the
System Inputs.
This input is used if the approach to the crossing consists of multiple separate
PSO receiver sections. The occupancy of these outer PSO receiver circuits can be fed into the
PSO Rx Enable input.
For example, Figure 10-17 shows how the receivers from two other PSO modules in the
GCP5000 (GCE) can be used to set the Enable Input for the receiver at the crossing.
If the PSO RX Enable input is assigned to a vital input and an external PSO or other track circuit
is being used, then it is worth considering bringing in the health of this external equipment, if it is
available, in order to cancel the stick in the event of the external track circuit going unhealthy.
Note that when a wrap is applied to a receiver at the crossing, its receiver enable input is also
wrapped. Thus, allowing a single wrap input to be used to wrap the whole approach. Similar to
when the receiver at the crossing is taken out of service, its enable input is also taken out of
service.
PSO 1 Appr 1 Occ is available in the
System Outputs,
this
represents the occupancy of the
whole approach for PSO 1 RX 1 including tracks circuits that are used to set its Enable.
PSO 1 RX1 Occupancy is also available in the
System Outputs,
this
represents the occupancy
of just the PSO 1 RX 1 track circuit and does not include tracks circuits that are used to set its
Enable. This term is available as it may be needed when programming second train logic.