Ladder Logic (LAD) for S7-300 and S7-400 Programming - Bit logic INSTRUCTIONS COMPLETE
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Bit logic instructions work with two digits, 1 and 0. These two digits form the base of a number system
called the binary system. The two digits 1 and 0 are called binary digits or bits. In the world of contacts
and coils, a 1 indicates activated or energized, and a 0 indicates not activated or not energized.
The bit logic instructions interpret signal states of 1 and 0 and combine them according to Boolean
logic. These combinations produce a result of 1 or 0 that is called the ”result of logic operation” (RLO).
The logic operations that are triggered by the bit logic instructions perform a variety of functions.
There are bit logic instructions to perform the following functions:
▪️ -| |-- Normally Open Contact (Address)
▪️--| / |--- Normally Closed Contact (Address)
▪️--(SAVE) Save RLO into BR Memory
▪️XOR Bit Exclusive OR
▪️--( ) Output Coil
▪️--( # )--- Midline Output
▪️--|NOT|--- Invert Power Flow
The following instructions react to an RLO of 1:
▪️--( S ) Set Coil
▪️--( R ) Reset Coil
▪️SR Set-Reset Flip Flop
▪️RS Reset-Set Flip Flop