Siemens SIMATIC RF 300 System Manual page 12

Safety information
System expansion
Only install system expansion devices designed for this device. If you install other upgrades,
you may damage the system or violate the safety requirements and regulations for radio
frequency interference suppression. Contact your technical support team or your sales outlet
to find out which system upgrades are suitable for installation.
Caution
If you cause system defects by installing or exchanging system expansion devices, the
warranty becomes void.
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System Manual, 05/2005, (4)J31069 D0166-U001-A1-7618, --
RF 300