Object PmaWeb (Web server)

Description:

The object creates a Web server from the PROMOTIC application, i.e. it allows the application to provide for example HTML or XML pages.

In the PmaWeb object it is possible to create the PmaWebFolder, PmaWebLang, PmaWebDir and PmaWebInfo objects.
This object can be created in objects: PmaRoot, PmaFolder, PmaPrototype. Multiple objects of this type can be created in such objects.

This object adopts properties and methods of the PmaObject object.

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Port	Number of the TCP/IP port

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AddEvent	Registers a function into selected event
GetInfo	Returns the Info object with the specified name
GetOwnedByIndex	Returns the subobject defined by its index
GetOwnedByName	Returns reference to the subobject defined by its name
GetOwnedByType	Array of references to the subobjects
GetOwnedNum	Returns number of subobjects in the object
GetPar	Reading the value of the Pma object parameter (or its parents)
GetPathName	Object name with the path to this object
GetPermission	Returns permission of corresponding operation from object
Methods	Access to designer's methods of this object
Name	Object name (without the path)
Parent	Returns reference to the parent object in the tree of Pma objects
Pm	Returns reference to the Pma object or to its implementation subobject
RemoveEvent	Un-registers the function in the specified event
Root	Returns reference to the root application object PmaRoot

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onNewRequest	(obsolete) Is triggered on the request for each new Web page

:

onStart	Is triggered for each object in the runtime only once at the beginning
onStop	Is triggered for each Pma object in the runtime mode only once at the stop of the application

Configuration tabs:

Object	General information about the object
Events	Definition of object events algorithms
Web	Setting TCP/IP parameters of the PROMOTIC Web
Permissions	Object permissions

Note:

The object creates a Web server from the PROMOTIC application, i.e. it allows the application to provide for example HTML or XML pages. See Overview of the Web technology in the PROMOTIC system and HTTPS - secured HTTP protocol.

Except the objects inserted directly, also another objects (Web components) located elsewhere in the tree of Pma objects can be registered into this object (e.g. PmaPanel, PmaWorkspace, PmaTrendGroup, PmaAlarmGroup, PmaData objects, etc.). These extra objects are registered into this object using the "Web server" tab in the "PmaWeb object" configurator. All these objects will become Web subcomponent of this object, i.e. URL address of these subcomponents will begin with the URL address of this object.

The runtime information regarding the status of the PROMOTIC Web server communication with its clients (the statistics of HTTP transmissions, the contents of the last transmissions, etc.) can be observed in the "/COMM/WebServer" item of the INFO system.

History:

Pm9.00.00: Object name changed: PmWeb -> PmaWeb

Pm8.02.16: Fixed bug: Under high load the Web server stopped working (especially with setting of the http service type).

Pm8.02.00: "Web server type=http internal" now supports persistent connection according to HTTP/1.1. It means that after each transmission, the connection is NOT terminated which makes the communication faster.

Pm8.01.09: The Web server has been improved - now supports the persistent connection type (standard for HTTP/1.1), i.e. the connection with the Web browser is not closed after each transmission. This way the transfer rate is increased and the communication load is decreased.

Pm8.01.00: The new "Web server type" configurator can be used in order to implement new Web server type "HTTP(S) service". This server type allows to use more secure HTTPS protocol.

Pm8.00.13: Other minor bugfixes are related to object.

PROMOTIC 9.0.16 SCADA system documentation - MICROSYS, spol. s r.o.

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