Siemens SINUMERIK 840D sl Operating Manual page 284

Alarm, error, and system messages
14.5 PLC and NC variables
Note
"Filter/Search" when inserting variables
The start value for "Filter/Search" of variables differs.
For example, to insert the variable $R[0], set "Filter/Search":
 The start value is 0, if you filter according to "System variables".
 The start value is 1, if you filter according to "All (no filter)". In this case, all signals are
Changing operands
Depending on the type of operand, you can increment or decrtement the address by 1 place
at a time using the "Operand +" and "Operand -" softkeys.
Note
Axis names as index
For axis names, the softkeys "Operand +" and "Operand -" do not act as index, e.g. for
$AA_IM[X1].
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displayed and shown in the OPI notation.
Examples
DB97.DBX2.5
Result: DB97.DBX2.6
$AA_IM[1]
Result: $AA_IM[2]
MB201
Result: MB200
/Channel/Parameter/R[u1,3]
Result: /Channel/Parameter/R[u1,2]
Operating Manual, 02/2011, 6FC5398-6AP40-0BA0
Universal