User manual

Magelis C - 55
4. Dialog table
C
The notion of a block is extremely useful in certain protocols, which
support what is known as optimization: Instead of reading a series of
words in the equipment word by word, they can be read in blocks, which
is much faster.
 Command data sent by the PLC to the display unit
This involves the following commands:
- Advanced functions
- Terminal language
- Display an application page
- Display alarm pages
- Lock keys
- Variable field input request
- Control of indicator lights associated with the function keys
- Set real-time clock command
- Write table authorization
- Print instructions
 Status data sent by the display unit to the PLC
This involves the following states:
- The display-unit status:
- display-unit configuration mode
- confirmation of entries with the key
- cancellation of an input with the key
- cancellation of an input after a time-out
- current language
- new time given by the operator
- The number of the page displayed
- The number of the last field entered
- The image of the keypad keys
- The real-time clock status (date and time)
- Communication monitoring
- The number of the last alarm to be acknowledged
- Application checksum
- Terminal advanced status
- Log fill level
XBT ref. Note
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