Predefined Variables

There are certain variable structures in FileGlobals and StationGlobals, which need to be present for a LTT testplan to work properly. A LTT testplan need to have an item named LTT and of type LTT_Client_Data placed in its FileGlobals.

FileGlobals

The FileGlobals.LTT.CFG container contains variables representing the current test configuration. Those variables are automatically filled at start.

TestStation, DutName, DutType, Group, OrderName, QualName

Those variables are filled with the data entered in F11 dialog of LTT GUI.

BasePath

Path to the directory where your LTT sequence file is located.

PS_Index, PS_Indizes, TS_Index, TS_Indizes

A DUT belongs to a test group and a test group can have one or more power supplies and temperature sensors assigned. The X_Index variable holds the zero based (!) index of the assigned power supply/temperature sensor, whereas the X_Indizes array holds all assigned indexes. You rarely need to use those since the assigned PS and TS are automatically controlled and usually do not need your further assistance.

FileGlobals CFG

The FileGlobals.LTT.RV container contains variables representing various runtime values which get updated frequently during testplan execution.

Runtime, Cycles

The current runtime of this test in seconds. The current cycles of this test.

OpModeSeq, OpMode

The currently executing operation mode. Note that the variable OpModeSeq holds the exact sequence name, whereas the variable OpMode holds the name of the operation mode (without the sequence prefix).

HW

FileGlobals.LTT.RV.HW contains voltages and currents of all configured power supplies as well as the temperatures of all configured temperature sensors. Use the FileGlobals.LTT.CFG.XX_Index variables to determine which PS/TS is relevant for that particular DUT.

HW.TCC

The current TCC value. Please note that this value is not masked. It represents the value of all 8 bits of the TCC input.

FileGlobals RV

A LTT testplan need to have an item named LTT and of type LTT_Global_Settings placed in its StationGlobals.

StationGlobals

The StationGlobals.LTT container is mainly used for internal parameters which you do not need to know or modify, nor should you. An exception is the StationGlobals.LTT.MESSY container. In that you will find some variables of relevance.

Variable	Description
ENABLED	If false no MesSy setup is performed in LTT process model. This can be used to run a LTT testplan without MesSy. Be aware that if you have MesSy API calls in your testplan those will fail. You can, however, check this variable as a precondition in every MesSy step.
ERR_TOL_MS	TODO: description. (for MesSy V1 compatibility)
TIMEOUT_S	MesSy communication timeout.
VERSION	MesSy version: 1 or 2. This is set by GUI!