User manual

Magelis C - 73

7. Description of dialog-table words

 Terminal advanced state

This word is used split into two bytes, the first of which is reserved and

the second used bit by bit.

Current password level

These three least-significant bits (0 to 2) in the lower byte contain

information relating to the current display-unit password. Each bit is at 1

if the associated password is selected, and each bit is at 0 if the

associated password is not selected.

The advantage of this word is as follows: It enables the display-unit

password to be used as the password for the PLC (enabling, for

example, the whole process to be switched to a certain state, for

example maintenance, by means of the display unit, by entering the ad

hoc password: The display unit can then access pages shared by a

maintenance password, and the PLC can thus know that the display unit

is in maintenance mode, enabling it in turn to switch to a mode where it

is ready to accept modifications).

It should be noted that for reasons of compatibility with existing PLC

applications, there is also a bit in the "Report" word (the

CONFIDENTIAL_MODE bit), which is at 1 as soon as at least one

password has been confirmed.

XBT -> PLC Reserved equals 000000CBA

Bit 15 8 7 2 1 0

XBT -> PLC Report

Bit 15 0

XBT ref. Note