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Programmable Logic Controller plant through MMI Part 10

Tham khảo tài liệu 'programmable logic controller plant through mmi part 10', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 110 Programmable Logic Controller P 7 l rl Ei EJ fh z. ZE4 E4 hj ị- P r r4 P R2 P R3 P K4 1 I R2 R2 R4 X P E4 Ej tft IK1 r4 R2 P E2 E2 t R2zR3 P E3 E3 fh R3zP4 P E4 22 where Z1 is normalized term and is represented by Z1 EI p 1 EEEp 2W3 p R4 P E R1 I R2 R3 R4 xP E3 E3 X3zR4 P E4 E4 t 1 R4 l. 4 E4 fft R1zR2 P E2 E2 th R2zK3 23 SubSystem Set of events SubSystem Set of events Lanel E1 ei e2 e3 Crane1 E2 e3ze4 Lane2 E3 e4ze5ze6 Crane2 E4 e6 e7 Table 1. Set of events in each subsystem Symbol Detail of fault rj Lanel is normal rj Speed of the belt-conveyor LI is reduced rj Sensor S2 does not respond with probability of 50 . fg Crane 1 is normal i g Lane2 is normal. r3 Speed of the belt-conveyor L2 is reduced. r3 Sensor S5 does not respond with probability of 50 . Tg Crane2 is normal. r4 Works fall from crane C2 with probability of 50 . Table 2. Candidates of fault Method Success Wrong Diagnosis Undetection Decentralized Method 81.0 12.7 6.3 Centralized Method 92.9 2.4 4.7 Table 3. Comparison between decentralized method proposed and centralized method conventional 7.5 Results of fault diagnosis 7.5.1 Faultless case Fig.12 shows the profiles of the fault occurrence probability in each subsystem wherein no fault has occurred in the entire controlled system. The result in the subsystem 2 Crane 1 is Centralized Decentralized Fault Diagnosis of Event-Driven Systems based on Probabilistic Inference 111 eliminated because no fault has considered in the subsystem 2. In Figs.12 a to 12 c the probability of the normal lị becomes almost 1 before 45 sec in all subsystems and this result lasts until the experiment is completed. This implies that the result of the diagnosis for all subsystems are normal and agrees with the actual situation of the system. b Diagnosis result for Lane2 c Diagnosis result for Crane2 Fig. 12. Diagnosis result in the faultless case r rỊ rị q 7.5.2 Multiple faulty case Fig.13 shows the profiles of the fault occurrence probability in each subsystem wherein .