Processing by the terminal. Schneider Electric XBTF / TXBTF Graphic terminals (Tome 2)

3. PLC/terminal communication dialog cycle

Processing by the terminal

Five types of transactions are carried out by the terminal, either intermittently or in a processing cycle:

Dialog table cycle

This comprises reading and writing by the terminal of the parameters selected from the dialog table, including the alarms table, at intervals specified in XBT-L1000.

Permanent variables refresh cycle

At intervals specified in XBT-L1000. (

See chapter B, "Graphical curve",

Page 27.

)

Displayed page variables refresh cycle

Single reading of variables when calling up a new page

Immediate writing of variable when the function key is pressed or a value entered.

C - 30 Graphic Magelis