PLTXB is a standard SAP Structure so does not store data like a database table does. It can be used to define the fields of other actual tables or to process "PS Texts (Document Tables PLTX and PSTX)" Information within sap ABAP programs. This is done by declaring abap internal tables, work areas or database tables based on this Structure. These can then be used to store and process the required data appropriately. i.e. DATA: wa_PLTXB TYPE PLTXB.
The PLTXB table consists of various fields, each holding specific information or linking keys about PS Texts (Document Tables PLTX and PSTX) data available in SAP. These include FLG_SEL (Version is valid on key date entered), PLMANDT (Client), PLPLNTY (Task List Type), PLPLNNR (Key for Task List Group)... See below for full list along with technical details, documentation, text table, check tables, foreign key relationships, conversion routines, relevant tcodes and example ABAP select code etc. .