STEP 5 Operations S5-115F Manual
3.2.3 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 3-12 provides an overview of these operations.
Table 3-12. Overview of Bit Test 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 ( Table 3-13).
Parameter
0 to 127.15
0 to 127.15
0 to 255.15
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 ( Table 3-13).
ID
T
C
D
RS
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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.
1
RS applies only to TB and TBN.
Table 3-13 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 3-13. Effect of ”TB” and ”TBN” on the RLO
0
0 1
Operation TBN
Signal state of the bit in
the operation indicated
1
Result of logic operation 1 0
TB
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