Automatic control function programming manual ladder language

3.7 I/O Card Interface Variables %I and %Q
This type of variable is associated with the following elements:
- 32-discrete-input cards,
- 32-discrete-output cards,
- 32-discrete-input/24-discrete-output card,
- 32-24 I/O cards,
- 64-48 I/O card,
- machine panel,
- machine panel 32-discrete-input/24-discrete-output extension cards.
Each interface discrete I/O card includes:
- a block of 64 bytes of %I read variables
- a block of 64 bytes of %Q write variables.
Variables
The I/O cards are addressed logically (see Sec. 3.7.4) on four digits. The default value (no reconfiguration) is:
I
%
Q
Logical @ = geographic @
Rack No.
(0 to 6)
Card No.
(1 to C)
r c
Logical @
(0 to 3F)
The card number c and rack number r are related to the type of equipment. Refer to the Installation and Commissioning
Manual for rack addressing.
Equipment type Rack number Card number
Main 19" rack 0 5 to C
Main 12" rack 0 5 to 8
12-card extension rack 1 to 6 1 to C
2-card extension rack 1 to 6 1 and 2
Machine panel 0 1 to 4
Example
%I3500 Represents read byte 0 on card 5 in rack 3.
%Q652F Represents write byte 0x2F on card 5 in rack 6.
REMARK Logical (as opposed to geographical) addressing is also possible (see Sec. 3.7.4).
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