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Railway Project 2017 > Interface > interface.png

Errors:

collision_error
- -1: no error
- other values: a single track with multiple trains
train_speed_mismatch_error[NUM_TRAINS]
- -1: no error
- 1: the front and rear wagon have different speeds
train_point_changed_error[NUM_TRAINS]
- indicates, that a point was changed while the train was standing on it,
  i.e., the front passed the point, but the rear not yet.
- -1: no error
- other values: the point that has the error
wagon_error_message[NUM_TRAINS][2]
- -1: no error
- 1: point not set correctly
- 2: wagon uses wrong direction on KH_LN_2 or KH_LN_7, because the corresponding point was set wrongly
- 3: wagon position under min of track (indicates a mistake in the environment)
- 4: wagon position over max of track (indicates a mistake in the environment)
- 5: diamond point set to send a train backwards through IC or OC. May cause further unexpected behavior
wagon_error_pos[NUM_TRAINS][2]
- NOTE: The meaning depends on wagon_error_message.
- if wagon_error_message is 0
  - this error can be ignored
- if wagon_error_message is 1, 2 or 5
  - the point on which the error occurs
- if wagon_error_message is 3 or 4
  - the track on which the error occurs

Environment:

```
track_contacts: int[NUM_TRACKS][2]
```
- 0: no signal
- 1: forwards
- 2: backwards
- 3: uni
```
cross_contacts: int[NUM_CONTACTS]
```
- 0: no signal
- 1: closing
- 2: opening

User:

```
train_setup: int[NUM_TRAINS] 
```
- index: train number
- value: track number, (negative: train stands against main travel direction)
```
destination: int[NUM_TRAINS]
```
- index. train number
- value: track number
```
speeds: int[NUM_TRAINS][4]
```
- index: train number
- index: 0-3
- value: 1-127

Controller:

```
track_speeds: int[NUM_TRACKS]
```
- 0: off
- 1 to 127: forward speed
- -1 to -127: backward speed
```
signals: int[NUM_TRACKS][2]
```
- 0: off
- 1: red
- 2: yellow
- 3: green
```
lamps: bool[NUM_LAMPS]
```
- true: on
- false: off
```
cross_light: int
```
- 0: off
- 1: red
- 2: yellow
```
bell: bool
```
- true: on
- false: off
```
points: bool[NUM_POINTS]
```
- true: branch
- false: straight
```
gate: bool
```
- true: down
- false: up
```
reached: bool[NUM_TRAINS]
```
- index: train number
- value: true: destination reached; false: destination not yet reached

Scheduler:

```
schedule: int[NUM_TRAINS]
```
- index: train number
- value: next save track on the way to destination

scchart environment {
 
  //------------------------------------------------------------\\
  //--                       INPUTS                           --\\
  //------------------------------------------------------------\\
  // Initial track of the trains
  input int train_setup[NUM_TRAINS];
  // Speed of all tracks
  input int track_speeds[NUM_TRACKS];
  // State of all switches
  input bool points[NUM_POINTS];
  // State of all signals
  input int signals[NUM_TRACKS][2];
  
  //------------------------------------------------------------\\
  //--                       OUTPUTS                          --\\
  //------------------------------------------------------------\\
  // State of all contacts of the railway
  output int track_contacts[NUM_TRACKS][2];
  
  //------------------------------------------------------------\\
  //--                  RAILWAY  CONSTANTS                    --\\
  //------------------------------------------------------------\\
  const int NUM_TRACKS = 48;
  const int NUM_TRAINS = 11;
  const int NUM_POINTS = 30;
  const int NUM_LAMPS = 24; 
  const int NO_TRACK = -1;
  
  //------------------------------------------------------------\\
  //--                  RAILWAY  INTERFACE                    --\\
  //------------------------------------------------------------\\
  const int OFF = 0, RED = 1, YELLOW = 2, GREEN = 4;
  const int ON  = 1, OFF = 0, FWD    = 1, REV   = 2, BRAKE = 3;
  
  const int DOWN = 0, UP = 1;
  const int NONE = 0, UNI = 3;
  
  const int STRAIGHT = 0, BRANCH = 1;
  
  const int IC_JCT_0 = 0 , IC_LN_0  = 1 , IC_LN_1 = 2 , IC_LN_2 = 3;
  const int IC_LN_3  = 4 , IC_LN_4  = 5 , IC_LN_5 = 6 , IC_ST_0 = 7;
  const int IC_ST_1  = 8 , IC_ST_2  = 9 , IC_ST_3 = 10, IC_ST_4 = 11;
  const int IO_LN_0  = 12, IO_LN_1     = 13, IO_LN_2 = 14;
  
  const int KH_LN_0  = 15, KH_LN_1     = 16, KH_LN_2 = 17, KH_LN_3 = 18;
  const int KH_LN_4  = 19, KH_LN_5     = 20, KH_LN_6 = 21, KH_LN_7 = 22;
  const int KH_LN_8  = 23, KH_ST_0     = 24, KH_ST_1 = 25, KH_ST_2 = 26;
  const int KH_ST_3  = 27, KH_ST_4  = 28, KH_ST_5 = 29, KH_ST_6 = 30;
  const int KIO_LN_0 = 31, KIO_LN_1 = 32;
  
  const int OC_JCT_0 = 33, OC_LN_0     = 34, OC_LN_1 = 35, OC_LN_2 = 36;
  const int OC_LN_3  = 37, OC_LN_4     = 38, OC_LN_5 = 39, OC_ST_0 = 40;
  const int OC_ST_1  = 41, OC_ST_2     = 42, OC_ST_3 = 43, OC_ST_4 = 44;
  const int OI_LN_0  = 45, OI_LN_1     = 46, OI_LN_2 = 47;
 
  initial state init; 
}