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Enhanced Write Filter Operational Procedures Using the Application

Protect the PAC Image with EWF

The EWF"Enhanced Write Filter" protects a volume from write access must be activated to protect a stable version of the PAC"Programmable Automation Controller" PAC is a compact controller that combines the features and capabilities of a PC-based control system with that of a typical programmable logic controller (PLC). A PAC thus provides not only the reliability of a PLC, but also the task flexibility and computing power of a PC. Additionally, because they function and communicate over popular network interface protocols, PACs are able to transfer data from the machines they control to other machines and components in a networked control system image from data corruption.

  1. Close all applications
  2. Launch EwfWinDLLcaller.exe by pressing Start > Run and typing: EwfWindDLLcaller

  3. Click the EnableEnable signal for the drive, Hardware-Enable with 24V signal to X8, Software-Enable command by setup Software, fieldbus or permanently set. Both are required for enabling the drive. button

    You will receive a message about the Enable being successful.

  4. Restart the computer
    If the icon in the system tray is green then EWF is active.

Perform Changes on a Protected Volume

The EWF has to be disabled to perform changes on a PAC.

  1. Close all applications.
  2. Launch EwfWinDLLcaller.exe
  3. Click on the Commitanddisable button
    Any configuration change written to RAM will be committed to the CF and then EWF will be disabled. You will receive a message about the DisableRemoval of the ENABLE signal. Disables power stage. being successful.
  4. Restart the computer.
    If the icon in the system tray is a red slashed-circle then EWF is disabled.

After changes are made to the system, the EWF should be re-enabled to protect the PAC image. See Protect the PAC Image with EWF.

 

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