Siemens SIMATIC S5-115U User Manual page 605

S5-115U Manual
A Operations List
A.1 Explanation of the Operations List
Abbreviation Explanation
ACCUM 1 Accumulator 1 (When accumulator 1 is loaded, any existing contents are shifted into accumulator 2.)
ACCUM 2 Accumulator 2
CC0/CC1 Condition code 0/Condition code 1
CSF STEP 5 control system flowchart method of representation
Formal operand Expression with a maximum of 4 characters. The first character must be a letter of the alphabet.
LAD STEP 5 ladder diagram method of representation
OV Overflow. This condition code bit is set if, e.g., a numerical range is exceeded during arithmetic operations.
PII Process image input
PIQ Process image output
RLO Result of logic operation
RLO affected? The RLO is affected/not affected
Y/N by the operation.
RLO dependent? Y The statement is executed only if the RLO is "1".
Y / The statement is executed only on positive/negative edge change of the RLO.
N The statement is always executed.
RLO reloaded? Y The RLO does not change. The RLO cannot be combined any further. When the next binary operation takes
place (but not assignment operation), the RLO is reloaded.
N Depending on whether the operation affects the RLO, the RLO is combined further or left unchanged
according to the operation and the status of the bit that was scanned.
STL STEP 5 statement list method of representation
EWA 4NEB 811 6130-02b
Operations List
A-1