WebHMI Docs

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====== WebHMI functionality ======
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===== Features of the visualization and control interface =====
  * to create, edit and manage the project **no special software is required** - all work is in the web interface in the browser.
  * visualization of processes is carried out on dashboards (instrument panels, screens) with the help of various objects (text, scales, indicators, image trends, video streams, etc.)
  * In addition to the means of displaying the current state, there are means of working with **archived** data:
    * historical graphs - allows you to conveniently analyse the archive data directly in the interface
    * parameter's logs allow you to record data at a specified frequency, or by changing a parameter to a certain value.

**Events** is a convenient mechanism for logging situations, for example, a certain condition has been fulfilled (the damper has opened and the temperature of the object has reached the specified value), while the parameters associated with this can be automatically recorded - the event start/end time, average/max/min. Parameter values during this Events, etc. The data is stored as a separate structural record, convenient for analysis. Nesting is supported, i.e. Hierarchy of events, where each level represents a "layer" of interesting information about the process. 

**Scripts** provide almost complete freedom of data processing. Visual script and event editor is intuitive. 

**Database** process is stored on the **SD card** for easy archiving of archives Provides ftp access.


===== Integration into the "cloud" =====

The device provider offers a data integration to the "cloud" service that provides data collection from distributed systems (for example, substation network, elevator facilities, heat points, etc.) into a single interface (Internet site)

There is no need to purchase expensive equipment - a separate server for the system. The customer pays the subscription fee. Fee for using the service, comparable to the cost of Internet traffic.

High reliability - uninterrupted power supply, reliable access channel to the system, automatic backup, data copying - provided by the service provider

===== Direct integration with business applications =====

Working with data in WebHMI is implemented through the API. Applications such as MS Office Excel, Word, 1C or any other user program (for example Android application) can exchange data with WebHMI using API - read and manage.

===== Network Communications =====

WebHMI has all router functions - provides routing between networks, port forwarding, firewall protection, VPN operations, and much more. It has 2 built-in Ethernet 10/100 and 1xWiFi 802.1b/g/n ports. WebHMI can be either a client in an existing wireless network or work in an access point mode. An interesting feature is the ability to work simultaneously in several networks ! (For example, to connect to the Internet in one network and at the same time, to distribute access to your resources to another).

Also supports the operation of a wireless network in WDS mode, which allows to combine several separate access points into one network with transparent roaming (one large network instead of several small ones).

If there is no wired connection, you can use the mobile 3G Internet. WebHMI supports working with most USB modems. In this case, you can use the usual inexpensive modems (and not industrial ones). Unfortunately in some situations such modems hang. WebHMI monitors the status of the modem and, if necessary, reconnects it, supporting a stable Internet connection.

In cases when remote access to WebHMI devices is required, you can use VPN technology.

In cases when you want to display several related processes, it is very important to synchronize the time between them. WebHMI supports NTP protocol (standard time synchronization protocol on the network) as a client or server.

===== Communication with automation devices =====

When you need to connect to several field devices with different protocols and bit rates, you can do this only with several physical ports (multiport board or built-in ports of the operator panel), with static configuration of the protocol of exchange on each of the ports. Built in the same WebHMI port, RS-485 can "on the fly" switch protocol type while maintaining high performance, which allows you to connect to WebHMI many different devices with different protocols, using a single physical port. The built-in RS-485 port also has a galvanic isolation, it can operate at speeds up to 921Kbits.

If you need more RS-485 ports (for example, there is not enough bandwidth for high-speed devices) or RS-232/422 ports, you can use external USB converters → COM port, the number of which can be increased using a USB hub connected to Built-in USB 2.0 WebHMI port.

Built-in Ethernet gateway function -> COM port. The Virtual UART function allows you to access the serial port of a remote PLC or other equipment (for example, for remote debugging or updating a program) through a network that includes WebHMI (wired or wireless).

Modbus ASCII / RTU, Modbus / TCP, S7 Communication and PPI (Siemens), DF1 (Allen-Bradley), Melsec (Mitsubishi), 1-Wire, and OWEN protocols are supported.

Built-in Modbus/TCP gateway function -> to any other protocol supported by WebHMI. An interesting application is the connection of heterogeneous systems (Schneider, Allen-Bradley, Siemens, etc.) to each other, when WebHMI devices are installed in different systems, allow them to exchange data among themselves.

With the help of fast scripts it is easy to implement the gateway "any protocol" to "any protocol".