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Set and Reset Bit Field
Table 7- 10
SET_BF and RESET_BF instructions
LAD
FBD
1
For LAD and FBD: These instructions must be the right-most instruction in a branch.
1
For SCL: You must write code to replicate this function within your application.
2
Table 7- 11
Data types for the parameters
Parameter
Data type
OUT
Bool
n
Constant (UInt)
Set-dominant and Reset-dominant flip-flops
Table 7- 12
RS and SR instructions
LAD / FBD
SCL
Not available
Not available
For LAD and FBD: These instructions must be the right-most instruction in a branch.
1
For SCL: You must write code to replicate this function within your application.
2
S7-1200 Programmable controller
System Manual, 03/2014, A5E02486680-AG
SCL
Description
Not available
Set bit field:
When SET_BF is activated, a data value of 1 is assigned to "n"
bits starting at address tag OUT. When SET_BF is not
activated, OUT is not changed.
Not available
Reset bit field:
RESET_BF writes a data value of 0 to "n" bits starting at
address tag OUT. When RESET_BF is not activated, OUT is
not changed.
Description
Starting element of a bit field to be set or reset (Example:
#MyArray[3])
Number of bits to write
Description
Reset/set flip-flop:
RS is a set dominant latch where the set dominates. If the set (S1) and reset (R)
signals are both true, the value at address INOUT will be 1.
Set/reset flip-flop:
SR is a reset dominant latch where the reset dominates. If the set (S) and reset
(R1) signals are both true, the value at address INOUT will be 0.
Basic instructions
7.1 Bit logic operations
207
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