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Ladder Logics is a programming language standardized in IEC 61131-3 and widely used for programming industrial Programmable Logic Controllers (PLC). A PLC program consists of inputs (whose values are given at runtime by factory sensors), outputs (whose values are given at runtime to factory actuators), and the logical expressions computing output v...
Contexts in source publication
Context 1
... 4 shows a screenshot of this graphical interface. This is what our prototype returns when run on example of figure 1. In this case, the interface states the errors occurs at BCD instruction call location (it is colored in red). ...
Context 2
... drawback of our prototype concerns the fact that it may raise false positive alarms, since it only considers one scan of the Ladder program. For example in Figure 1, value of device D0 may be changed after the BCD instruction call, such that value 10, 000 is never reached. Nevertheless, our prototype would still raise an alarm. ...
Context 3
... way to improve our prototype could be to provide some quickfix-like mechanisms to programmers. In example of Figure 1, our prototype could propose to the programmer to add automatically, before the BCD instruction call, a line that resets D0 when it does not belong to range [0; 9999]. ...
Context 4
... 4 shows a screenshot of this graphical interface. This is what our prototype returns when run on example of figure 1. In this case, the interface states the errors occurs at BCD instruction call location (it is colored in red). ...
Context 5
... drawback of our prototype concerns the fact that it may raise false positive alarms, since it only considers one scan of the Ladder program. For example in Figure 1, value of device D0 may be changed after the BCD instruction call, such that value 10, 000 is never reached. Nevertheless, our prototype would still raise an alarm. ...
Context 6
... way to improve our prototype could be to provide some quickfix-like mechanisms to programmers. In example of Figure 1, our prototype could propose to the programmer to add automatically, before the BCD instruction call, a line that resets D0 when it does not belong to range [0; 9999]. ...
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