Hardware
The S5 line comes in the 90U, 95U, 101U, 100U, 105, 110, 115, 135U, and 155U chassis styles.Higher the number(except for the 101U), the more sophisticated and more expensive the system. Within each chassis style, several CPUs are available, with varying speed, memory, and capabilities. Some systems provide redundant CPU operation for ultra-high-reliability control, as used in pharmaceutical manufacturing, for example.
Each chassis consists of a power supply, and a backplane with slots for the addition of various option boards. Available options include serial and Ethernet communications, digital input and output cards, analog signal processing boards, counter cards, and other specialized interface and function modules.
Read more about this topic: Simatic S5 PLC
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