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STEP 5 Operations
8.2.3
Bit Test Operations
Bit test operations scan digital operands bit by bit and affect them. Bit test operations must
always be at the beginning of a logic operation. Table 8-12 provides an overview of these
operations.
Operation
Operand
TB
TBN
SU
RU
ID
T
C
D
RS
1
1 RS applies only to TB and TBN.
Table 8-13 shows how the RLO is formed during the bit test operations "TB" and "TBN". An
example for applying the bit operations follows the table.
Table 8-13. Effect of "TB" and "TBN" on the RLO
Operation
Signal state of the bit in
the operation indicated
Result of logic operation
8-42
Table 8-12. Overview of Bit Operations
Test a bit for signal state "1"
A single bit is scanned regardless of the RLO. The RLO is affected
according to the bit's signal state (see Table 8-13).
Test a bit for signal state "0"
A single bit is scanned regardless of the RLO. The RLO is affected
according to the bit's signal state (see Table 8-13).
Set a bit unconditionally
The addressed bit is set to "1" regardless of the RLO. The RLO is not
affected.
Reset a bit unconditionally
The addressed bit is set to "0" regardless of the RLO. The RLO is not
affected.
Parameter
0 to 127.15
0 to 127.15
0 to 255.15
0 to 255.15
P
0
1
0
1
Meaning
PN
0
1
1
0
EWA 4NEB 811 6130-02b
S5-115U Manual
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