Operating instructions

Maintenance and service
12.4 Removing and installing hardware components
SIMATIC Panel PC 677B
106 Operating Instructions, 05/2007, A5E01035609-01
12.4.3 Removing/Installing Memory Module
Memory expansion options
The motherboard is equipped with 2 slots for memory modules. For 184-pin DDR2 RAM
chips, unbuffered, no ECC. This allows you to expand device memory up to 4 GB, of which
you can use approx. 3.2 GB for the operating system and applications. You can install one or
two modules.
Combination Slot X1 Slot X2 Maximum
expansion
1 512 MB / 1 GB / 2 GB 2 GB
2 512 MB / 1 GB / 2 GB 512 MB / 1 GB / 2 GB 4 GB
Preparation
Disconnect the device from mains and unplug all cables.
Caution
The electronic components on the PCBs are highly sensitive to electrostatic discharge.
Always take appropriate precautionary measures when handling these components. Refer
to the ESD directives on handling electrostatic sensitive components.
Notice
We highly recommend using memory modules approved by Siemens. Siemens disclaims
any liability for impairment of functions caused by the use of third-party memory modules.