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![Address based PLCs](https://images.findtheneedle.co.uk/findtheneedle/products/4101875.jpg)
Each PLC has a fixed list of pre-allocated address types. The following are examples of these fixed address types e.g. Siemens S7 "M1.0" binary , Allen Bradley SLC 500 "N7:5" - Integer. Comments and documentation must be added to the address to describe its function.
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