Thursday, June 28, 2012

Bit Logic Instructions


Overview of Bit Logic Instructions 
Description : 
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
Other instructions react to a positive or negative edge transition to perform the following functions:
 ---(N)---  Negative RLO Edge Detection
•  ---(P)---  Positive RLO Edge Detection
•  NEG  Address Negative Edge Detection
•  POS  Address Positive Edge Detection
• Immediate  Read
• Immediate  Write !--RELATED-POSTS-STARTS-->

No comments:

Post a Comment