Initial model in Software Incoporate datamatrix 2d barcode in Software Initial model

17.3 Initial model use software gs1 datamatrix barcode integration toincoporate datamatrix 2d barcode in software Web application framework Event route_reservation cor 2d Data Matrix barcode for None responds to the reservation of a route r. It is done on an unreserved route (i.e.

r R \ resrt) whose blocks are not already reserved for a route (i.e. rtbl 1 [{r}] resbl = ).

Route r is then reserved together with its blocks. This is coherent with requirement FUN-5, which says that a route can be reserved as soon as all its blocks are themselves reserved:. route_reservation any r whe re r R \ resrt rtbl 1 [{r}] resbl = then resrt := resrt {r} rsrtbl := rsrtbl rtbl {r} resbl := resbl rtbl 1 [{r}] end. route_freeing any r where r resrt \ ran(rsrtbl) then resrt := resrt \ {r} end Event route_freeing makes a reserved route free when it does not contain reserved blocks any more. This is coherent with requirement MVT-3, which says that a route can be made free when no blocks are reserved for it any more. Event FRONT_MOVE_1 corresponds to a train entering a reserved route r.

The rst block of r must be reserved and unoccupied. Moreover, the reserved route corresponding to the rst block of r must be r itself. The rst block is made occupied:.

FRONT_MOVE_1 any r where r Software barcode data matrix resrt f st(r) resbl \ OCC rsrtbl(f st(r)) = r then OCC := OCC {f st(r)} end. FRONT_MOVE_2 any b, c where b OCC c B \ OCC b c nxt(rsrtbl(b)) then OCC := OCC {c} end Event FRONT_MOVE_2 correspo Data Matrix ECC200 for None nds to the occupancy of a block, which happens to be di erent from the rst block of a reserved route. Given a block b, which is occupied and preceded (in the same route) by a block, say c, which is not occupied, then c is made occupied. Finally, event BACK_MOVE corresponds to the move of the rear part of the train.

This happens for a block b which is occupied and is the last block of a train. This is detected when block b has a follower in the route r reserved for b and that follower, if reserved, is not reserved for r (this corresponds to the big implicative guard). Moreover,.

Train system when b has a predecessor, t Software ECC200 hat predecessor must be occupied so that the train does not disappear before reaching the end of route r (this corresponds to the last guard). The action corresponding to that event makes b unoccupied and unreserved. This is coherent with requirement MVT-1, which says that once a block of a formed route is made unoccupied, it is also freed : BACK_MOVE any b, n where b OCC n = nxt(rsrtbl(b)) b ran(n) n 1 (b) dom(rsrtbl) 1 rsrtbl(n (b)) = rsrtbl(b) b dom(n) n(b) OCC then OCC := OCC \ {b} rsrtbl := {b} rsrtbl resbl := resbl \ {b} end.

Important remark It might s eem strange at rst glance (and even incorrect) to have physical events such as FRONT_MOVE_1, FRONT_MOVE_2, and BACK_MOVE using non-physical variables in their guards. Clearly, a physical event can be enabled under certain conditions depending on physical variables only: a physical event cannot magically see the non-physical variables. The reason for having non-physical variables in the guards here is that we are still in an abstract version where such abnormalities are possible.

Of course, in the nal re ned version of physical events we have to check that it is not the case any more.. 17.4 First re nement In thi Software 2d Data Matrix barcode s rst re nement, we introduce the physical tracks. So that the movements of the train will correspond entirely on the physical situation of the track.

Note however that we do not yet introduce the points and the signals.. 17.4.1 The state We do not introduce new carrier sets or new constants in this re nement. 17.4 First re nement Variables In this re nement , we have three new variables named T RK (track), f rm (formed routes), and LBT (last blocks of trains). Notice that the variables introduced in the initial models, namely resrt, resbl, rsrtbl, and OCC, are kept in this re nement: variables: T RK f rm LBT. The variable T RK is a part Software 2d Data Matrix barcode ial injection (inv1_1) from blocks to blocks de ning the physical succession of blocks. It also contains the direction taken by trains following the tracks. Note that this last information is not physical (you cannot see it on the track); it corresponds however to the physical movements of trains on the physical tracks.

Next is the invariant de ning variable T RK as an injective function: inv1_1: T RK B. Here is an illustration of the variable T RK in a certain situation:.
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