Allen-Bradley LOGIX 5000 Reference Manual page 402

Chapter 6 Logical and Move
402
Available Languages
Ladder Diagram
This instruction is not available in ladder diagram logic.
Function Block
Structured Text
DFF(DFF_tag);
Operands
Function Block
Operand Type
DFF tag FLIP_FLOP_D
FLIP_FLOP_D Structure
Input Parameter Data Type
EnableIn BOOL
D BOOL
Clear BOOL
Clock BOOL
Output Data Type
Parameter
EnableOut BOOL
Q BOOL
QNot BOOL
Rockwell Automation Publication 1756-RM006K-EN-P - November 2018
Format Description
structure DFF structure
Description
Enable input. If cleared, the instruction does not execute and
outputs are not updated.
Default is set.
The input to the instruction.
Default is cleared.
Clear input to the instruction. If set, the instruction clears Q and
sets QNot.
Clock input to the instruction.
Default is cleared.
Description
Indicates if instruction is enabled.
The output of the instruction.
The complement of the Q output.