Product Overview
1.2 Pre-configured SIMATIC Microbox 427B-HMI/RTX
Microbox 427B-RTX/ -HMI/RTX and Panel PC 477B-HMI/ -HMI/RTX
Manual, 12/2007, A5E01217837-01
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The SIMATIC Microbox 427B-HMI/RTX contains SRAM (static RAM) that is non-volatile. You
can use this non-volatile RAM (NVRAM) for retentive data storage. WinAC RTX is pre-
configured to store up to 128 Kbytes of retentive data in this integrated, battery-buffered
SRAM of the HW platform.
If the retentive data is greater than 128 Kbytes, your must switch to file storage with the
WinAC Data Storage Tool. The SIMATIC Microbox 427B-HMI/RTX uses a CompactFlash
card for data storage. In order to save retentive data in a power loss situation, protect your
system with an Uninterruptable Power Supply (UPS).
Typically, you use the Enhanced Write Filter (EWF) to protect the C:\ drive of the
CompactFlash card; however, you must take care to manage the EWF (Page 46) if you use
the C:\ drive for any file storage. For WinCC flexible RT, a D:\ drive on the CompactFlash
card with the EWF disabled is required.
The section "Storing Retentive Data - Configuring WinAC Data Storage" of the Controller
Operations chapter of the WinAC RTX documentation describes the storage of retentive
data.
In addition to this documentation, you can find technical specifications and other information
in the SIMATIC Microbox 427B-HMI/RTX product documentation. Refer to the
accompanying WinAC RTX documentation for a complete description of WinAC RTX and
how to use it for PC-based automation solutions. The preface (Page 3) of this documentation
lists other manuals that can be useful.
