zLogGvlConstant (GVL)

List of global constants used in the data logger library.

:General information for constants and parameter

  • Dataset: 1 dataset always has 400 bytes (zLOG_CONST_LENGTH_1DS)

  • FifoIn: has a maximum capacity of zLOG_CONST_FIFOLIMIT datasets and is stored in persistent memory

  • FifoOut: has a maximum capacity of zLOG_CONST_FIFOLIMIT datasets and is stored in non-persistent memory

  • File: 1 file stores up to 65535 data records (zLOG_CONST_DSproFILE), which are copied block by block from the FifoIn in case of a communication lost

  • A maximum of 999 files (zLOG_CONST_FILELIMIT) can be saved

  • In purely mathematical terms, that would be 999 files * 65535 datasets * 400 byte / dataset = 26,187,786,000 bytes = 26 GB

InOut:

Scope

Name

Type

Initial

Comment

Constant

zLOG_CONST_LENGTH_1DS

UDINT

400

1 DataSet in FIFO/FILE has maximum 400 Bytes

zLOG_CONST_ARRAYLIMIT_1DS

UDINT

399

zLOG_CONST_FILELIMIT

UDINT

999

1…999 Files possible (0 is not used = “NoFile”)

zLOG_CONST_DSproFILE

UDINT

65535

Maximum 65535 Datasets/File possible