9.16 How to use write protection (EWF) for the Compact Flash card (CF
card)
Write protection with Enhanced Write Filter (EWF)
Enhanced Write Filter (EWF) is a component of the SIMATIC PCS 7 AS mEC RTX operating
system. You can use EWF to write-protect the CF card. When EWF is activated, write access
operations are redirected to the working memory. No changes can be made to the CF card.
The EWF is enabled the next time the SIMATIC PCS 7 AS mEC RTX starts.
Requirements
The following software is installed on the SIMATIC PCS 7 AS mEC RTX:
● Operating system
● Software package WinAC RTX with controller
● You can access the Windows interface of the SIMATIC PCS 7 AS mEC RTX. Options:
– A Remote Desktop connection has been established via network connection 1 (plant
bus).
– You have connected a monitor, mouse and keyboard to the SIMATIC PCS 7 AS mEC
RTX.
Procedure
1. Select the menu command Start > SIMATIC > Manage AS-RTX.
– After activating the EWF, select the menu command EWF for C ON.
– To deactivate the EWF, select the menu command EWF for C OFF.
2. Reboot the SIMATIC PCS 7 AS mEC RTX.
Checking the status of the Enhanced Write Filter (EWF)
1. Select the menu command Start > SIMATIC > Manage AS-RTX > EWF State.
Notes on operation with an activated EWF filter
● If the EWF filter is activated, no further changes may be made in the Station Configuration
Editor.
● To load changes made to the hardware via HW Config, only the entry "WinLC RTX" may
be selected in the "Target Group" dialog box.
● Only connections can be loaded via NetPro.
Commissioning and configuring SIMATIC PCS 7 AS mEC RTX
9.16 How to use write protection (EWF) for the Compact Flash card (CF card)
BOX (V8.1)
116 Function Manual, 03/2015, A5E32711362-AC
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