Automatic control function programming manual ladder language

3.7.4 Card Configuration Variables
3.7.4.1 Card Identifier %Qrc3E.W
This field indicates the type of card the user expects to find in the location of rack r and card slot c. It must be
programmed in an %INI task.
It is used to check whether the card/rack configuration of an application is correct. The check is made by comparing
this identifier with the values read in %Irc3E.W.
REMARK If there is a difference between the specified configuration %Qrc3E.W and the actual
configuration %Irc3E.W, the general I/O card configuration error bit %R97F.1
(DEFCONF) is set, the inputs and outputs are no longer refreshed and the watchdog
is reset.
%Qrc3E.W is initialised with 0x700. This value indicates that the card is not configured. In this case, the monitor
processes the card only if it is present in the rack.
Example
%Q123E.W == Contains the identifier of the card expected in slot 2 of rack 1.
3.7.4.2 Logical/Geographic Address Option %Qrc3D.B
This option is used to choose the physical card associated with variables %Irc and %Qrc. This facilitates management
of physical changes of the system since it is not necessary to change the input/output variables in the programme.
If byte %Qrc3D.B == r’c’, the physical card associated with variables %Irc and %Qrc is card c’ of rack r’.
%Qrc3D.B must be initialised with r’c’ in task %INI since the system only reads %Qrc3D.B on return from %INI.
When r’ does not indicate a configured rack or c’ does not indicate a configured card (ERROR_CONFIG_SBCE error),
the general I/O card configuration error bit %R97F.1 (DEFCONF) is set, the inputs and outputs are no longer refreshed
and the watchdog is reset.
As the geographic identification of the bus is carried out before task %INI, the user can use word %Irc3E.W (card
identifier) in this task. If the logical addressing option (%Qrc3D.B) is used, the identifier read on the bus is moved
accordingly in the input/output table.
Example
In the basic configuration, there is a 32I/24O card in slot 7 of the main rack.
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32I/24O card in rack 0, slot 7
For this card, the user programme is written with variables %I07xx.x and %Q07xx.x.