Specifications

Section VII – Pre-emption and Transit Priority Program/Read Mode (continued)
Pre-empt set up....................................................................................................... 7-2
Memory/delay/reservice .......................................................................................... 7-2
Pre-empt overlap inhibits ........................................................................................ 7-3
Entry timings ........................................................................................................... 7-3
Priorities .................................................................................................................. 7-3
Hold only ................................................................................................................. 7-4
Delay option ............................................................................................................ 7-4
Low priority pre-emption (LPPE) ............................................................................. 7-4
Example pre-empt sequences................................................................................. 7-4
Programming the example pre-empt screens............................................................... 7-5
Sequence programming.......................................................................................... 7-5
Railroad sequence .................................................................................................. 7-5
Soft flash sequence................................................................................................. 7-6
Special interval programming.................................................................................. 7-6
Pre-empt mappable inputs and outputs........................................................................ 7-8
Pre-empt no-delay inputs ........................................................................................ 7-8
Pre-empt acknowledge outputs 1-6......................................................................... 7-8
Note about use of mappable functions.................................................................... 7-8
89 Code “gap timer” feature ......................................................................................... 7-8
Priority return pre-empt feature..................................................................................... 7-9
Basic features and descriptions .............................................................................. 7-9
Priority return........................................................................................................... 7-9
Example using 95 priority return code.....................................................................7-10
Operation ................................................................................................................7-10
Transit priority operation...............................................................................................7-11
Introduction .............................................................................................................7-11
Transit priority input mapping..................................................................................7-11
Transit priority input screens ...................................................................................7-11
Input definitions.......................................................................................................7-11
Transit priority call detection and initial operation....................................................7-12
Transit priority set-up programming ........................................................................7-12
Phases/memory/delay.............................................................................................7-12
Input fail timer..........................................................................................................7-13
Limits on max extend due to pre-existing offset seeking conditions........................7-13
Min resv ..................................................................................................................7-13
Transit priority group timing.....................................................................................7-14
TP max value computation during coordination operation ......................................7-14
TP group walk timing computation during coordination...........................................7-15
TP free mode ..........................................................................................................7-15
Transit priority coord options...................................................................................7-16
Post TP max ext’s until 1
st
FO.................................................................................7-16
Post TP max ext values ..........................................................................................7-17
Auto extend feature.................................................................................................7-17
Transit priority run (Status) screens ........................................................................7-17