Device polling intervals

[oley]

Hi,

the documentation to device polling says about Time and Period properties:

If both options are zero, the device is polled continuously and cyclically. If the time is specified and the period is zero, the device is polled once a day at the specified time. If the period is greater than zero, the device is polled periodically, starting at the specified time

Am I correct in understanding that, to achieve a fixed and continuous polling interval, I need to set the time to 00:00:00 and the period to the desired interval – for example, 00:00:05 for five seconds?

Currently, we’ve been using the default settings (zero), which means continuous polling, but I want to reduce the load and implement fixed intervals for the devices. If I set Time/Period to 00:00:00/00:00:05, will all polls start simultaneously?

What is the Delay parameter used for? If I set a fixed interval and add a delay, will that extend the interval?

[manjey73]

Currently, we’ve been using the default settings (zero), which means continuous polling, but I want to reduce the load and implement fixed intervals for the devices. If I set Time/Period to 00:00:00/00:00:05, will all polls start simultaneously?

Yes, as far as I remember, the survey will start at the same time, and then every 5 seconds a survey will be conducted, also at the same time if the devices are located on different lines.

If you set both the Time and the Period, then you can distribute the surveys.
For example, set the time to 5 seconds, the period is 5 seconds, then in theory this device will be polled every 5 seconds
Set the other device to 7 seconds and 5 seconds, then the device will be polled every 7 seconds.

[manjey73]

The polling time of different devices will periodically coincide, but this is not so scary. Since polling on different lines is performed in different tasks.

[Mikhail]

Hi,
You should play with Time/Period parameters. Set them to 00:00:05/00:00:10, for example, and check communication line log.
The Delay parameter specifies a delay after each request.

• This reply was modified 10 hours, 50 minutes ago by Mikhail.

[oley]

Hi,

thanks. What is the purpose of the Delay parameter?
Will it be added to the Period, e.g. Time/Period -> 00:00:05/00:00:10 and Delay 1000 means it will polling every 11 seconds?

[Author]

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