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Description
900P02-0001 HONEYWELL | Power supply board (CPU chassis)
Product technology
900P02-0001 HONEYWELL | Power supply board (CPU chassis)
As can be seen from the above, the mode of pure hardware redundancy has more hardware input and greater cost. And software redundancy, only need to add a CPU module, the cost increase is very small, because generally like CPU this PLC heart, manufacturers will be equipped with spare parts, with spare parts to achieve redundancy control, not only improve the reliability and maintainability of the system (can do online maintenance, does not affect the operation of the production line), but also will not significantly increase the cost.
From the perspective of reliability analysis, pure hardware redundancy has no advantage over software redundancy. Because more components and modules are added, the failure of these components and modules may affect system reliability. For example, if the cable connecting two hot spare modules is faulty, the redundancy control will also fail. With software redundancy, only one CPU module is added, and the failure rate of two CPU modules at the same time is almost zero.
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