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How long can the SiteManager retain data during connection loss ?

It's very difficult to give an exact time for how long the SiteManager can retain data.

It depends on a number of factors such as:

  • Number of sample points,
  • size of the individual sample point,
  • Sample rate
  • and allocated number of samples per samplepoint.

The store'n'forward size is defined under each sample-point as the SamplesSaved value.
That determines the number of values you want to save to the DB.
The S'n'F DB has a capacity of:

11xx/33xx: 80 Mbytes

15xx/35xx: 80 Mbytes + use of SD-card storage
(Performance may deteriorate due to the speed of the SD-card)

See DCM > Status for info on your device.

So if SamplesSaved = 10000 and you sample that sample-point every 10 seconds then you can store data from the last 100000 seconds or 1666 minutes ≈ 28 hours as long as Current DB ram cache size doesn't exceed the Max DB ram cache size allowed.

The SampleDataType sizes:

Type Store'n'forward size
“bool” (1 bit) 1 byte
“sbyte” (8 bit signed) 1 byte
“byte” (8 bit unsigned) 1 byte
“int16" (16 bit signed) 2 bytes
“uint16” (16 bit unsigned) 2 bytes
“int32" (32 signed) 4 bytes
“uint32” (32 bit unsigned) 4 bytes
“int64" (64 bit signed) 8 bytes
“uint64” (64 bit unsigned) 8 bytes
“float” (32 bit) 4 bytes
“double” (64 bit) 8 bytes
“string” (variable text up to 24575 bytes. Includes terminating NULL) <=24575 bytes
“data” (variable data up to 24575 bytes) <=24575 bytes

This article covers

SiteManager models 11xx/33xx with Firmware v9.0_19075

Creation date: 11/12/2019 14:12 (skr@secomea.com)      Updated: 10/06/2020 14:57 (tvo@secomea.com)