Siemens SIMATIC RI45 PII Series Product Information Bulletin page 7

Repairs
Only authorized personnel are permitted to repair the device. Unauthorized
opening and improper repairs on the device can result in significant danger to
the user.
Before you open the device, first switch it off and then disconnect the power
plug.
Install only system expansion devices provided for this computer. If you
install other expansion devices, you can damage the system or violate the
safety requirements and regulations for radio interference suppression.
Contact your technical support team or where you purchased your PC to find
out which system expansion devices may safely be installed.
If you install or exchange system expansions and damage your PC, the
warranty becomes void.
ESD
The following sticker can be used to identify modules with ESD
Guidelines
(electrostatically-sensitive devices):
If you handle modules with ESD, it is essential that you adhere to the
following guidelines:
Product Information Bulletin RI45 PII
C79000-Z7076-C814-02
Before you work with modules with ESD, you must statically discharge
yourself (for example, through contact with a grounded object).
Devices and tools you use must be free of a static charge.
Disconnect the power plug before you connect or disconnect modules
with ESD.
Touch modules with ESD on the edge only.
Do not touch any wiring posts or conductors on a module with ESD.
Safety Instructions
1-3