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System settings

System settings specify the performance parameters, the depth of data storage in logs and their visualization, as well as additional functions - ModBus/TCP server, WebHMI Cloud


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Communication interval

Specifies the period of data exchange with the connected devices. WebHMI reads all registers from all devices one by one. One such cycle is named scan. When possible WebHMI will insert delays between scans so they will run with specified interval.

A short interval increases the polling frequency, reduces the response when changing the register on the dashboard, and the 'response' of changes in the trends, but with a large number of interrogated data, they may not fit in the interval at the time, which will actually increase the scan, increase load on the system.

This settings should be set reasonably. If you need to 'have time' to query a large amount of data for a second, first you need to increase the speed of communication with devices, use the priority of reading the registers in conjunction with the option 'strict scan', do not read the auxiliary registers unnecessarily (use the read on-demand option for this).

Strict scan

This option allows to get a time-determined scan. It is usable for projects with hundreds and thousands of registers on slow serial connections.

If all registers fail to “fit in scan”, you can ask WebHMI read all important registers and a fraction of all other registers in every scan. This will allow update important registers much faster than others.

Critical registers should be given high priority in the register properties. And registers with normal priority should be set individually significantly longer polling time than the default scan interval. This will make WebHMI poll them less frequently and make Strict Scan feature possible.

Interface refresh

WebHMI uses Comet technology to push register value changes into browser at the end of every scan where it was changed. Sometimes register value changes too often. To save traffic and resources you can throttle send interval. You can tell WebHMI send these update not often than some interval. This setting is adjustable between 100 ms. up to 5 sec.

Hide menu

For some projects it makes sense to hide side menu. This option allows to hide menu by default.

Log level

This option sets level of the system log detail, possible values:

  • Disable log - disabled
  • Errors - errors only
  • Info+Errors - errors and informing messages
  • Debug+Info+Errors - previous plus debug info
  • Trace+Debug+Info+Errors - previous with trace data

Keep data in log for

This option sets the depth of storage of the stored data (logs of registers, events, data of graphs)

Battery power mode

3 various actions on external power outage:

  • shutdown immediately
  • wait 20 minutes, then shut down
  • work as long as possible (until battery will be discharged)

Modbus TCP server

MobBus server - when turned on, allows external client to poll the project register using Modbus/TCP protocol. (see function description)

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