Siemens CPU 948, Programming Manual

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3.5.1
Basic Operations
You can use the basic operations in all logic blocks and all methods of
representation (STL, LAD, CSF).
Binary logic operations
Operation Operand Function
A
O
I 0.0 to 127.7
Q 0.0 to 127.7
F 0.0 to 255.7
S 0.0 to 4095.7
D 0.0 to 255.15
T 0 to 255
C 0 to 255
AND logic operation after scanning for signal state "1"
OR logic operation after scanning for signal state "1"
of an input in the PII
of an output in the PIQ
of a flag bit
of an S flag bit
of a data word bit
of a timer
of a counter
AN
ON
I 0.0 to 127.7
Q 0.0 to 127.7
F 0.0 to 255.7
S 0.0 to 4095.7
D 0.0 to 255.15
T 0 to 255
C 0 to 255
AND logic operation after scanning for signal state "0"
OR logic operation after scanning for signal state "0"
of an input in the PII
of an output in the PIQ
of a flag bit
of an S flag bit
of a data word bit
of a timer
of a counter
O – Combine AND operations through logic OR
O
U(
O(
) – ANDing of expressions in parentheses
ORing of expressions in parentheses
Close parenthesis (to complete the bracketed expression)
Maximum of 8 levels are permitted, i.e. 7 opened brackets
RLO formation
The binary logic operations generate the result of logic operation
(RLO).
At the beginning of a logic sequence, the RLO only depends on the
signal state scanned (first scan) and not on the type of logic operation
(O = OR, A = AND).
Table 3-2 Binary logic operations
Basic Operations
CPU 948 Programming Guide
C79000-G8576-C848-04
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