FATEK M Series User Manual page 33

Chapter 3 Installation and Wiring
3-2-4 Installation of Expansion Modules
Expansion module installation method: after aligning the expansion module with the CPU Module
slot or with the slot of the previous expansion module, insert the module and then push the latch-hook
straight down to the base, as indicated in the figure below.
Install expansion module
Install the expansion module buckle
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M-Series PLC Expansion Module User Manual