Shared Environment Considerations

For users running the Designer from a shared directory, two facilities are provided to prevent conflicts between users.

DesignerPortSpecific Keyword

This PLBWin INI configuration keyword instructs the Designer to open its program information file using the current port number. Normally, the Designer INI file is named "Designer.ini". With this option set to a value one one (1), the file name becomes "designerNN.ini" where NN is the workstation port number obtained using a CLOCK PORT instruction. The Designer will also create its user defined objects file and its undo/repeat file with the workstation's port number as a part of the name. The user defined objects file is normally named "designer.uo". With this option set, the two digit port number is spliced into the name and it becomes "designerNN.uo". The same process is employed when creating the undo/repeat file using the default name of "Designer.ur" if the LimitOneTIme keyword is set.

Example PLBWIN.INI entries:

DesignerPortSpecific=1

PLB_PORT=12

LimitToOneInstance Keyword

This Designer INI configuration keyword controls the operation of the Designer when a second instance of the program is started on a single workstation. When set (the default), only one instance of the Designer is allowed to execute at any given time. Attempting to start a second instance will cause the first instance of the program to become active. In this mode, the Designer has the ability to automatically recover in the event of a power failure.

When cleared, any number of instances of the Designer may be started independently. In this mode the undo/repeat file becomes a virtual file and no disaster recovery is possible.