User manual

Magelis C - 53
C
4. Dialog table
 Introduction: Concepts
Human/machine dialogue between the Magelis display unit and the PLC
consists of an exchange of data between the two devices.
With any communication problem, define the following information:
- The data to be exchanged
- The protocol
-Etc.
The dialog table is used to perform the main display-unit functions:
- Feed back alarms from the control system (except XBT N200)
- Send commands to the control system using the image of the function
keys
- Signal to the operator that a particular action has been authorized, by
means of LEDs integrated in the keypad (XBT N401/R411)
The dialog table also enables the control system to control the product
almost as well as an operator:
- Display a page
- Change a variable field to input mode.
Moreover, the dialog table performs some functions that could be
deemed secondary (secondary because their purpose is not to give
instructions to the display unit or the pilot equipment), such as:
- Set terminal clock
- Lock certain keys on the keypad
-Etc.
Finally, the dialog table contains service information, such as:
- Authorization to interpret a table
- Communication monitoring
The dialog table located in the PLC consists of "n" consecutive words
(16-bit words). The number of words in the table depends on the choice
of status data and commands to be processed during dialog.
The XBT L100• program is used to make this selection.
XBT ref. Note
N200 No alarm management
N200/N400/N410
NU400
R400/R410
No indicator lights