Overview of Bit Logic Instructions Description Bit logic instructions work with two digits, 1 and 0. These two digits form the ba...
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)
Symbol
DESCRIPTION
---| |--- (Normally Open Contact) is closed when the bit value stored at the specified <address> is equal to "1". When the contact is closed, ladder rail power flows across the contact and the result of logic operation (RLO) = "1". Otherwise, if the signal state at the specified <address> is "0", the contact is open. When the contact is open, power does not flow across the contact and the result of logic operation (RLO) = "0". When used in series, ---| |--- is linked to the RLO bit by AND logic. When used in parallel, it is linked to the RLO by OR logic.
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