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Summarize the differences between s7 1200plc's expansion through signal board and signal module.
Difference: Different functions, different installation locations.

1 has different functions: the signal board is mainly used to expand the number of input/output points, while the signal module can expand different kinds of input/output signals, such as analog signals and digital signals.

2. Different installation positions: Generally, the signal board is directly inserted into the CPU module, and the signal module needs to be connected to the interface of the expansion module.