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A series structure is functioning if and only if all the blocks are functioning. This means that the structure fails as soon as one block fails. The RBD of a series structure of blocks is shown in Figure 2.12. A path is seen to be available between the end points (a) and (b) – and the system is functioning – if and only if all the blocks are functioning. The system function can be represented by the Boolean expression: The series structure is functioning if block 1 AND block 2 AND AND block are all functioning. As mentioned above, the sequence of the blocks in Figure 2.12 is not important, and we might have drawn the RBD with the blocks in any sequence.

Figure 2.12 RBD for a series structure.