Siemens SIMATIC S5-90U System Manual page 560

Operations List, Machine Code and List of Abbreviations
Abbreviation Explanation
OHS DB1 parameter: set operating hours counter
OP Operator panel
OV Overflow. This condition code bit is set if, e.g., a
numerical range is exceeded during arithmetic
operations.
PB Program block
(with block call and return operations)
PB or PY Peripheral byte
(depending on
type of program-
mer used)
PBUS DB1 parameter: startup only via connected bus units
PG Programmer
PGN DB1 parameter: SINEC L1, programmer bus number
PII Process image input table
PIQ Process image output table
PW Peripheral word
Q Output
QB Output Byte
QW Output word
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 Y The statement is executed only on positive/negative
/
edge change of the RLO.
N The statement is always executed.
RLO reloaded? When the next binary operation takes place, the
Y/N RLO is reloaded/not reloaded (e.g. A I 0.0).
RS System data area
- for load operations (supplementary operations) and
transfer operations (system operations)
- for bit test and set operations (system operations)
SAC STEP address counter
SB Sequence block
SDP DB1 block ID for system data parameters
SF DB1 parameter: SINEC L1, position of send mailbox
SL1 DB1 block ID for SINEC L1
SLN DB1 parameter: SINEC L1, slave number
STL STEP 5 statement list method of representation
A-20
S5-90U/S5-95U
Permissible Operand Value Range for
S5-90U S5-95U
(0 to 63) (0 to 255)
(32, 33) (0 to 127)
(32) (0 to 126)
(0.0 to 127.7) (0.0 to 127.7)
(0 to 127) (0 to 127)
(0 to 126) (0 to 126)
(0 to 255)
(0.0 to 255.15)
(0 to 255)
EWA 4NEB 812 6115-02b