PLBWEB_DEFAULT

PLBWEB_DEFAULT Keyword

PLBWEB_DEFAULT={ [ PlcProgName | WebPageName ] }

This keyword specifies the default PLB program name or a HTML web page file to be executed when a PL/B Web client initiates a logon request that does not have anything specified in the URL logon request string. If this keyword is not specified or this keyword is assigned to be null, the PL/B Web Server runtime locates and executes the ‘answer.plc’ applying the normal PL/B Answer\Master concept.

Note:

1. The {PlcProgName} program name must include the extension and the name is case sensitive.

2. The {PlcProgName} program name can begin with a relative sub-directory to the OS directory specified by the PLBWEB_PROGRAM_ROOT keyword. The {PlcProgName} cannot contain a fully qualified OS path.

3. If the PLBWEB_PROGDD keyword is set to an ‘off’ state, the {PlcProgName} may not contain any pathing information. Otherwise, the program may not be executed. When the PLB_PROGDD keyword is set to ‘off’, this configuration prevents unsolicited probing by malicious logon requests.

4. Alternatively, the PLBWEB_DEFAULT can specify the file name of a Web Page that is to be downloaded to a client browser when a PL/B Web client initiates a logon request that does not have anything specified in the URL logon request string.

Examples assuming PLBWEB_PROGDD=ON:

PLBWEB_DEFAULT=: In this case, when the PL/B Web Client URL does not provide a PLC program name, the PL/B Web Server locates and executes the 'answer.plc' program using the normal Answer\Master concept.
PLBWEB_DEFAULT=mymaster.plc: The program named ‘mymaster.plc’ is used as the default startup program. This PLC program must be located in the directory specified by the PLBWEB_PROGRAM_ROOT when the PLBWEB_PROGRAM_ROOT keyword is used. If the PLBWEB_PROGRAM_ROOT is NOT being used, the PL/B Web Server attempts to find and open the ‘mymaster.plc’ program like all other PL/B runtimes. First, the runtime attempts to open the PLC in the current working directory. Otherwise, the runtime scans the PLB_PATH directories to locate the PLC.
PLBWEB_DEFAULT=companyPath\mymaster.plc: The program named ‘companyPath\mymaster.plc’ is used as the default startup program where the PLC must exist in a sub-directory named ‘companyPath‘. If the PLBWEB_PROGRAM_ROOT is used, the ‘companyPath’ sub-directory must exist under the PLBWEB_PROGRAM_ROOT directory. Otherwise, normal runtime searching methods are used to find and open the PLC program.
PLBWEB_DEFAULT=c:\companyPath\mymaster.plc: A fully qualified Windows OS path is not allowed.
PLBWEB_DEFAULT=/usr/home/user/Path/mymaster.plc: A fully qualified Linux OS path is not allowed.
PLBWEB_DEFAULT=demo.html or PLBWEB_DEFAULT=index.html: A default web page is specified