Siemens SIMATIC FM 456-2 Installation, Hardware, And Startup page 54

Replacing Modules
Installing the AT Module
Install the new AT module in the AT adapter module in the reverse order (see
Section 2.4 "Installing a Short AT Card").
Then reinstall the AT adapter module in the module assembly and refit this to the
rack (see Sections 2.5 "Fitting Expansion Modules to an FM 456-2" and 2.6
"Installing a Module Assembly in the Module Rack").
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Figure 3-9 Removing an AT Module from an ATM 478 AT Adapter Module
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FM 456-2 Application Function Module Installation, Hardware, and Startup
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C79000-G7076-C458-01