Siemens SIMATIC IPC847D Operating Instructions Manual page 216

Glossary
WLAN
Wireless LAN is a local network that transmits data via radio waves, infrared light or another
wireless technology. Wireless LAN is mainly used for mobile computer applications in office
or factory environments.
ZMM
Zero Maintenance Cache Protection Module is a functional unit of the SAS Raid controller
that stores the data in the cache of the controller in the case of a voltage failure. This
functional unit is maintenance-free.
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Operating Instructions, 01/2014, A5E32997454-AA
SIMATIC IPC847D