Siemens S7-400 - Fitting Memory Cards in the Cpus

Maintenance
7-20
S7-400 and M7-400 Programmable Controllers Hardware and Installation
A5E00069481-04
6. If necessary, insert the second memory card in slot 2 in the same way.
7. Fit the cover on the upper left side of the CPU by securing it with three screws.
Slot 1
Slot 2
Figure 7-1 Fitting Memory Cards in the CPUs