S5-95F 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.
Table 8-12. Overview of Bit Operations
Operation Meaning
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).
Parameter
0.0 to 127.15
0.0 to 127.15
0.0 to 255.15
0.0 to 255.15
Operand
TB
TBN
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).
ID
T
C
D
RS
1
SU
RU
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.
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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
10
0 1
Operation TB TBN
Signal state of the bit in
the operand indicated
0 1
Result of logic operation 1 0
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EWA 4NEB 812 6210-02
8-41
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