Assembling the M7-400
8-56
S7-400 and M7-400 Programmable Controllers Hardware and Installation
A5E00069481-04
8.8.4
Replacing a Short AT Card
Removing an AT Card
Before you can replace a short AT card, you must remove the module assembly
and remove the ATM 478 AT adapter module from the assembly (see
Section 8.8.2, from page 8-49).
!
Warning
The modules can be damaged.
If the AT card is inserted or removed with power applied and without observing the
ESD guidelines, the CPU, AT adapter module, and the AT card can be damaged.
Never insert or remove the AT card with power applied. Always switch off the
power supply before inserting or removing the AT card. Observe the ESD
guidelines.
To remove a short AT card, follow the steps outlined below (see Figure 8-30):
1. Remove the cover from the upper left side of the ATM 478.
2. Unscrew the fixing bracket from the support plate of the AT card and from the
ATM 478 and remove it.
3. Remove the AT card from the side opening and from the front panel upwards
out of the plug-in contact.
4. Pull the AT card out of the slot from the front.
Fitting an AT Card
Fit the new AT card in the AT adapter in the reverse order (see Section 8.4.5
“Fitting the Short AT Card”, page 8-15).
Then refit the AT adapter module in the module assembly and install the latter in
the rack (see Section 8.4.6 “Assembling Expansion Modules on a Central Rack”
and Section 8.4.7 “Installing a Module Assembly in the Rack” on pages 8-17 and
8-24).
