Research Article
PLAT: An Automated Fault and Behavioural Anomaly Detection Tool for PLC Controlled Manufacturing Systems
Table 2
Example set of transition rules.
| | Current signal state | Next signal state | (Example) transition probability | (Example) average transition time | (Example) maximum transition time | (Example) transition time probability |
| | Group1-Device2-Signal2_OFF | Group1-Device2-Signal2_ON | 0.7 | 20.34 | 20.35 | 1 | | Group1-Device2-Signal2_OFF | Group1-Device2-Signal4_ON | 0.3 | 51.08 | 51.11 | 1 | | Group1-Device2-Signal2_ON | Group1-Device2-Signal4_ON | 1 | 15.07 | 15.13 | 1 | | Group1-Device2-Signal4_OFF | Group1-Device2-Signal2_OFF | 1 | 8.44 | 8.45 | 1 | | Group1-Device2-Signal4_ON | Group1-Device2-Signal4_OFF | 1 | 20.45 | 60.02 | 20.51 | 60.15 | 0.3 | 0.7 |
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Two transition times and their corresponding transition time probabilities.
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