PC Control / Profi Control 645-12M Instruction Manual pdf - Kuhnke
PC Control / Profi Control 645-12M Instruction Manual pdf - Kuhnke
PC Control / Profi Control 645-12M Instruction Manual pdf - Kuhnke
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<strong>PC</strong> <strong>Control</strong> <strong>645</strong>-<strong>12M</strong> used as PLC<br />
4.8.2. Offset addressing<br />
It is possible to indicate an offset together with the absolute<br />
address of a local operand. The address is then made up<br />
by adding absolute address and offset.<br />
L BM00.00[BM00.01] means that the value in BM00.01<br />
(offset) is added to the address of BM00.00. The resulting<br />
new address then responds to the load command.<br />
The value of the offset should be selected in a way that excludes<br />
exceeding the corresponding operand range (max.<br />
256 addresses).<br />
Reason: Exceeding the operand range leads to reading<br />
(with read commands L, A, O...) from or writing (with assignment<br />
commands =, =N) into an operand from another<br />
range.<br />
This may lead to unintended machine functions or to program<br />
destruction.<br />
Examples<br />
L M00.00[5] is the same as L M00.05<br />
= O01.00[6] is the same as = O01.06<br />
4.8.2.1. External operands used as offset<br />
Offset addressing of external operands (PROFIBUS inputs)<br />
is not possible.<br />
Example: L O03a00.00[3]<br />
However, external byte operands can be used as variable<br />
offset.<br />
Example: L BR01.00[BI03a00.]<br />
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