Addresses
The direct display of individual memory locations is done using special character sequences. These sequences are a concatenation of the percent sign "%", a range prefix, a prefix for the size and one or more natural numbers separated by blank spaces. The following range prefixes are supported:
Prefix | Description |
|---|---|
I | Input |
Q | Output |
M | Memory location |
The following size prefixes are supported:
Prefix | Description |
|---|---|
X | Single bit |
B | Byte (8 Bit) |
W | Word (16 Bit) |
D | Double word (32 Bit) |
* | Config variables (VAR_CONFIG) |
Examples:
%QX75.1 (*Bit 1 of output byte 75*)
%IW215 (*Input word 215*)
%QB7 (*Output byte 7*)
%MD48 (*Double word in memory position 48 in the memory location*)
 | Boolean values will be allocated bytewise, if no explicit single-bit address is specified |
Example: A change in the value of varbool1 AT %QW0 affects the range from QX0.0 to QX0.7.
Memory location
You can use any supported size to access the memory location, however the addressing is always bytewise. For example, the address %MD48 would address bytes numbers 48, 49, 50, and 51 in the memory location area because the size of a DWORD is 4 bytes. You can access words, bytes, and bits in the same way: the address %MX5.0 allows you to access the first bit in the fifth byte.
Notice | |
Using other platforms For a CX9xxx and CP with ARM platform, the 4-byte alignment is obligatory to be complained. |
Example:
rMyVar1 AT %MW0 : REAL;
rMyVar2 AT %MW4 : REAL;