C L A B K M H I J N D E F G in Software Deploy datamatrix 2d barcode in Software C L A B K M H I J N D E F G

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C L A B K M H I J N D E F G using software toassign 2d data matrix barcode for web,windows application ANSI/AIM Code 93 As can be seen, Software Data Matrix barcode route R9 (G F K I H H M ) is now established on the physical track. In Section 17.4.

2, we shall see how the event, which is positioning the points will modify this situation. Note that the crossing in block K is broken and that the physical track remembers the direction followed by trains circulating on it; of course, this is not what happen in the real tracks, but this is a convenient abstraction. Finally, all pairs belonging to T RK also belong to nxt(r) for some route r (inv_2):.

inv1_2: x, y x y T RK ( r r R x y nxt(r) ). The variable f r Software Data Matrix barcode m represents the set of formed routes; it is a subset of the reserved routes (inv1_3). This is coherent with requirement FUN-7, which says that a formed. Train system route is always Software DataMatrix a reserved route . We have a number of invariants involving the formed routes. The reserved routes of occupied blocks are formed routes (inv1_4).

A route r, which is reserved but not yet formed, is such that its reserved blocks are exactly the constant reserved blocks associated with r (inv1_5). The two previous invariants are coherent with requirements SAF-4, which says that no blocks of a reserved but not yet formed route are occupied :. inv1_3: f rm r esrt inv1_4: rsrtbl[OCC] f rm inv1_5: r r resrt \ f rm rtbl {r} = rsrtbl {r}. Now comes the mo Software datamatrix 2d barcode st important invariant (inv1_6); it relates the logical succession of blocks on a route (represented by the function nxt(r) for each route r) to the physical tracks on the terrain (represented by the variable T RK). It says that for each formed route r, the logical succession of blocks (where the train is supposed to be and where it has to go when proceeding through route r) agrees with the physical tracks on the terrain. In other words, when a route r is formed, then the portion of the physical blocks where the train is or where it will be in the future when proceeding along this route corresponds to what is expected in the logical blocks as recorded by the controller:.

inv1_6: r r f rm rsrtbl 1 [{r}] nxt(r) = rsrtbl 1 [{r}] T RK Finally, variabl Software barcode data matrix e LBT denotes the set of blocks occupied by the back of each train; this is also a physical variable like variable T RK. The rst invariant (inv1_7) concerning this variable, quite naturally says that the last block of a train is indeed occupied by a train:. inv1_7: LBT OCC 17.4 First re nement And now we state (inv1_8) that the last block b of a train, if it has a follower a on its route, then a, if reserved, is not reserved for the route of b:. inv1_8: a, b barcode data matrix for None b LBT b ran(nxt(rsrtbl(b))) a = nxt(rsrtbl(b)) 1 (b) a dom(rsrtbl) rsrtbl(a) = rsrtbl(b). Thanks to the in troduction of the physical variables T RK and LBT , we shall be able to de ne the movements of the train based only on what the train nds on the terrain, namely the physical blocks. Notice that a train knows that the last part of it occupies a block belonging to LBT ..

17.4.2 The event Data Matrix for None s Event route_reservation is not modi ed in this re nement.

Other events are modi ed as shown below. We also introduce two more events: point_positioning, route_formation Event point_positioning is still very abstract in this re nement. It conveys however the essence of the communication between the future software and the outside equipment; the physical T RK is modi ed according to the logical route nxt(r).

This event is coherent with requirement SAF-3, which says that a point can only be re-positioned if it belongs to a block that is in a reserved but not yet formed route . In further re nements, this modi cation of the physical track will correspond to the controller action modifying the point positions: point_positioning any r where r resrt \ f rm then T RK := (dom(nxt(r)) T RK ran(nxt(r))) nxt(r) end.
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