The block detection sections were numbered on the track plan. Each also belongs to a lettered power zone. A large spreadsheet was used to work out how best to allocate these to the BDL168 block detector outputs; each BDL168 provides 4 groups of 4 detectors, but each group can only be powered by one power zone.
| Track feed number | Power Zone | Rev? | Track Location | Sensor number | Wire Label |
|---|---|---|---|---|---|
| 1 | S | Green line Fiddle yard track 5 | 22,13 | S1 | |
| 2 | P | Green line Fiddle yard track 1, exit end | 21,1 | P2 | |
| 3 | P | Green line Fiddle yard track 2, exit end | 21,2 | P3 | |
| 4 | P | Green line Fiddle yard track 3 | 21,3 | P4 | |
| 5 | P | Green line Fiddle yard track 4 | 21,4 | P5 | |
| 6 | R | Orange line Fiddle yard track 1, exit end | 21,9 | R6 | |
| 7 | R | Orange line Fiddle yard track 2, exit end | 21,10 | R7 | |
| 8 | R | Orange line Fiddle yard track 3 | 21,11 | R8 | |
| 9 | R | Orange line Fiddle yard track 4 | 21,12 | R9 | |
| 10 | S | Orange line Fiddle yard track 5 | 22,14 | S10 | |
| 11 | N | Y | Reverse loop near Petersfield | 22,9 | N11 |
| 12 | L | Green line exit from fiddle yard | 23,1 | L12 | |
| 13 | M | Orange line entry to fiddle yard | 24,1 | M13 | |
| 14 | L | Green line Clanfield junction area | 23,3 | L14 | |
| 15 | L | Green line after Clanfield junction | 23,4 | L15 | |
| 16 | M | Orange line approach to Clanfield junction | 24,3 | M16 | |
| 17 | K | Approach road into Clanfield | 22,1 | K17 | |
| 18 | K | Exit road from Clanfield | 22,2 | K18 | |
| 19 | K | Clanfield platform 3 | 22,3 | K19 | |
| 20 | K | Clanfield platform 2 | 22,4 | K20 | |
| 21 | K | Clanfield platform 1 | 22,5 | K21 | |
| 22 | L | Green line exit after junction from Petersfield loop | 23,6 | L22 | |
| 23 | G | Orange line storage road 1 | 25,9 | G23 | |
| 24 | G | Orange line storage road 2 | 25,10 | G24 | |
| 25 | C | Green line storage road 1 | 25,5 | C25 | |
| 26 | C | Green line storage road 2 | 25,6 | C26 | |
| 27 | C | Green line exit from storage road | 26,15 | C27 | |
| 28 | C | Green line at foot of Butser Hill | 26,16 | C28 | |
| 29 | G | Orange line at foot of Butser Hill | 26,1 | G29 | |
| 30 | G | Approach to Portsmouth Loop | 26,9 | G30 | |
| 31 | G | Orange line running under Butser Hill | 26,3 | G31 | |
| 32 | G | Exit from Portsmouth Lop | 26,4 | G32 | |
| 33 | D | Y | Portsmouth loop line 1 | 27,13 | D33 |
| 34 | F | Y | Portsmouth loop line 2 | 27,9 | F34 |
| 35 | E | Y | Portsmouth loop line 3 | 27,5 | E35 |
| 36 | C | Portsmouth line junction to Green line | 25,7 | C36 | |
| 37 | G | Portsmouth line junction to Orange line | 26,7 | G37 | |
| 38 | C | Green line to junction for Portsmouth | 25,8 | C38 | |
| 39 | G | Orange line from junction for Portsmouth | 26,6 | G39 | |
| 40 | M | Approach road into Eastleigh | 24,12 | M40 | |
| 41 | M | Orange line by junction for Eastleigh | 24,11 | M41 | |
| 42 | L | Green line approach to Petersfield | 23,9 | L42 | |
| 43 | L | Petersfield Platform 1 | 23,10 | L43 | |
| 44 | L | Petersfield Platform 2 | 23,11 | L44 | |
| 45 | L | Petersfield Platform 3 | 23,12 | L45 | |
| 46 | M | Petersfield Platform 4 | 24,5 | M46 | |
| 47 | M | Petersfield Platform 5 | 24,6 | M47 | |
| 48 | M | Orange line exit from fiddle yard | 24,7 | M48 | |
| 49 | L | Green line entry to fiddle yard | 23,16 | L49 | |
| 50 | B | Eastleigh depot stand 1 | 25,1 | B50 | |
| 51 | B | Eastleigh depot stand 2 | 25,2 | B51 | |
| 52 | A | Approach road into Portsmouth | 28,1 | A52 | |
| 53 | A | Exit road from Portsmouth | 28,2 | A53 | |
| 54 | A | Portsmouth platforms to throat, incoming | 28,3 | A54 | |
| 55 | A | Portsmouth platforms to throat, outgoing | 28,4 | A55 | |
| 56 | B | Portsmouth ladder junction to goods area | 27,1 | B56 | |
| 57 | A | Portsmouth Platform 1 | 28,5 | A57 | |
| 58 | A | Portsmouth Platform 2 | 28,6 | A58 | |
| 59 | A | Portsmouth Platform 3 | 28,7 | A59 | |
| 60 | A | Portsmouth Platform 4 | 28,8 | A60 | |
| 61 | A | Portsmouth Platform 1 START | 28,13 | A61 | |
| 62 | A | Portsmouth Platform 2 START | 28,14 | A62 | |
| 63 | B | Eastleigh depot stand 1 STOP | 25,3 | B63 | |
| 64 | B | Eastleigh depot stand 2 STOP | 25,4 | B64 | |
| 65 | A | Portsmouth Platform 1 STOP | 28,9 | A65 | |
| 66 | A | Portsmouth Platform 2 STOP | 28,10 | A66 | |
| 67 | A | Portsmouth Platform 3 STOP | 28,11 | A67 | |
| 68 | A | Portsmouth Platform 4 STOP | 28,12 | A68 | |
| 69 | A | Portsmouth Platform 3 START | 28,15 | A69 | |
| 70 | A | Portsmouth Platform 4 START | 28,16 | A70 | |
| 71 | C | Green line at foot of Butser Hill STOP | 26,14 | C71 | |
| 72 | G | Orange line running under Butser Hill STOP | 26,2 | G72 | |
| 73 | C | Green line storage road 1 STOP | 25,13 | C73 | |
| 74 | C | Green line storage road 2 STOP | 25,14 | C74 | |
| 75 | G | Orange line storage road 1 STOP | 25,11 | G75 | |
| 76 | G | Orange line storage road 2 STOP | 25,12 | G76 | |
| 77 | L | Green line after Clanfield junction STOP | 23,5 | L77 | |
| 79 | M | Orange line approach to Clanfield junction STOP | 24,2 | M79 | |
| 80 | L | Green line exit from fiddle yard STOP | 23,2 | L80 | |
| 81 | K | Clanfield platform 3 STOP | 22,6 | K81 | |
| 82 | K | Clanfield platform 2 STOP | 22,7 | K82 | |
| 83 | K | Clanfield platform 1 STOP | 22,8 | K83 | |
| 84 | P | Green line Fiddle yard track 1 STOP, exit end | 21,5 | P84 | |
| 85 | P | Green line Fiddle yard track 2 STOP, exit end | 21,6 | P85 | |
| 86 | P | Green line Fiddle yard track 3 STOP | 21,7 | P86 | |
| 87 | P | Green line Fiddle yard track 4 STOP | 21,8 | P87 | |
| 88 | N | Y | Reverse loop near Petersfield block 1 STOP | 22,10 | N88 |
| 89 | S | Orange line Fiddle yard track 5 STOP | 22,15 | S89 | |
| 90 | R | Orange line Fiddle yard track 1 STOP, exit end | 21,13 | R90 | |
| 91 | R | Orange line Fiddle yard track 2 STOP, exit end | 21,14 | R91 | |
| 92 | R | Orange line Fiddle yard track 3 STOP | 21,15 | R92 | |
| 93 | R | Orange line Fiddle yard track 4 STOP | 21,16 | R93 | |
| 94 | L | Petersfield Platform 1 STOP | 23,13 | L94 | |
| 95 | L | Petersfield Platform 2 STOP | 23,14 | L95 | |
| 96 | L | Petersfield Platform 3 STOP | 23,15 | L96 | |
| 97 | M | Petersfield Platform 4 STOP | 24,9 | M97 | |
| 98 | M | Petersfield Platform 5 STOP | 24,10 | M98 | |
| 99 | C | Portsmouth line junction to Green line STOP | 25,15 | C99 | |
| 100 | C | Green line to junction for Portsmouth STOP | 25,16 | C100 | |
| 101 | G | Portsmouth line approach STOP | 26,8 | G101 | |
| 102 | D | Y | Portsmouth loop line 1 STOP | 27,14 | D102 |
| 103 | F | Y | Portsmouth loop line 2 STOP | 27,10 | F103 |
| 104 | E | Y | Portsmouth loop line 3 STOP | 27,6 | E104 |
| 105 | G | Orange line from junction for Portsmouth STOP | 26,5 | G105 | |
| 106 | L | Reverse loop near Petersfield block 2 | 23,8 | L106 | |
| 107 | L | Green line approach to Petersfield | 23,7 | L107 | |
| 108 | M | Orange line by junction for Eastleigh | 24,4 | M108 | |
| 109 | C | Green line behind Butser hill | 26,13 | C109 | |
| 110 | G | Orange line behind Butser hill | 26,10 | G110 | |
| 111 | M | Orange line approach to junction for Petersfield loop | 24,8 | M111 | |
| 112 | S | Green line Fiddle yard track 5 STOP | 22,16 | S112 | |
| 113 | R | Orange line Fiddle yard track 1, approach end | 20,1 | R113 | |
| 114 | R | Orange line Fiddle yard track 1 STOP, approach end | 20,2 | R114 | |
| 115 | R | Orange line Fiddle yard track 2, approach end | 20,3 | R115 | |
| 116 | R | Orange line Fiddle yard track 2 STOP, approach end | 20,4 | R116 | |
| 117 | P | Green line Fiddle yard track 1, approach end | 20,5 | P117 | |
| 118 | P | Green line Fiddle yard track 1 STOP, approach end | 20,6 | P118 | |
| 119 | P | Green line Fiddle yard track 2, approach end | 20,7 | P119 | |
| 120 | P | Green line Fiddle yard track 2 STOP, approach end | 20,8 | P120 | |
| 121 | B | Eastleigh depot far end headshunt | 161,2 | B121 | |
| 122 | B | Eastleigh depot run past loop | 161,3 | B122 | |
| 123 | B | Eastleigh depot near end headshunt | 161,4 | B123 | |
| 124 | B | Eastleigh depot sidings | 161,5 | B124 | |
| 125 | B | Eastleigh depot stand 1 START | 27,2 | B125 | |
| 126 | B | Eastleigh depot stand 2 START | 27,3 | B126 | |
| 127 | B | Portsmouth station loco spur | 27,4 | B127 | |
| 128 | B | Main throat area for Portsmouth contained yard | 29,1 | B128 | |
| 129 | B | Portsmouth yard head shunt START | 29,2 | B129 | |
| 130 | B | Access road to turntable at Portsmouth engine shed | 29,3 | B130 | |
| 131 | B | Turntable bed in Portsmouth engine shed | 29,4 | B131 | |
| 132 | B | Portsmouth turntable road 1 | 29,5 | B132 | |
| 133 | B | Portsmouth turntable road 2 | 29,6 | B133 | |
| 134 | B | Portsmouth container yard road 1 START | 29,7 | B134 | |
| 135 | B | Portsmouth container yard road 2 START | 29,8 | B135 | |
| 136 | B | Portsmouth container yard road 1 | 29,9 | B136 | |
| 137 | B | Portsmouth container yard road 2 | 29,10 | B137 | |
| 138 | B | Portsmouth container yard road 1 STOP | 29,11 | B138 | |
| 139 | B | Portsmouth container yard road 2 STOP | 29,12 | B139 | |
| 140 | B | Portsmouth container yard runaround | 29,13 | B140 | |
| 141 | B | Portsmouth container hard shunt at far end | 29,14 | B141 | |
| 142 | B | Portsmouth carriage siding road 1 START | 29,15 | B142 | |
| 143 | B | Portsmouth carriage siding road 2 START | 29,16 | B143 | |
| 144 | B | Portsmouth carriage siding road 1 | 30,1 | B144 | |
| 145 | B | Portsmouth carriage siding road 2 | 30,2 | B145 | |
| 146 | B | Portsmouth contained yard runaround START | 30,4 | B146 | |
| 147 | B | Portsmouth contained yard runaround STOP | 30,3 | B147 | |
| 148 | B | Portsmouth yard headshunt middle | 30,5 | B148 | |
| 149 | B | Portsmouth yard headshunt STOP | 30,6 | B149 | |
| 150 | K | Clanfield platform 1 START | 162,1 | K150 | |
| 151 | B | Portsmouth carriage siding road 1 STOP | 30,8 | B151 | |
| 152 | B | Portsmouth carriage siding road 2 STOP | 30,9 | B152 | |
| 153 | B | Portsmouth engine shed road 1 | 30,10 | B153 | |
| 154 | B | Portsmouth engine shed road 2 | 30,11 | B154 | |
| 155 | K | Clanfield factory | 162,2 | K155 | |
| 156 | K | Clanfield Factory STOP | 162,3 | K156 | |
| 157 | K | Clanfield Shunter end | 162,4 | K157 | |
| 158 | G | Eastleigh junction to Portsmouth approach | 26,11 | G158 | |
| 159 | G | Orange 1 STOP | 26,12 | G159 | |
| 160 | C | Green 4 STOP | 158,1 | C160 |
Sensors 113-120 are connected to 2xBD4, wired to SIGM20 #6
Sensors 121-124 are connected to a BD4, wired to DAC20 #7, inputs 2-5
sensors 150, 155-157 are connected to a BD4, wired to DAC20 #6.