L9_NCBT: Normally Closed Bit
(Original Document)
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Naming
Name in LL984 Editor
Function Block Name
name of legacy 984 instruction
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Function Description
The L9_NCBT normally closed bit procedure senses the logic state of a specified bit within a word located in %MW memory. The bit is representative of an N.C. contact.
REG is the word that contains the bit to be examined. The BITLOC value identifies the specific bit - 1 through 16 - to be examined. The OUT output turns ON when the ENABLE input is ON and the specified bit is OFF.
Representation
Parameters
Input Pin
Name
Data Type
Address Range
Meaning
Top
ENABLE
BOOL
–
ON enables the operation.
Node
Node Type
Name
Data Type
Address Range
Meaning
Top
IN
IN_REG
UINT
%IW, %MW
The variable located to a word that contains the bit to be examined.
Bottom
IN
BITLOC
UINT
1...16
The specific bit to be examined.
Valid range: 1 to 16.
Note: Employs LL984 bit addressing: 1-based starting at the left end of 16-bit sequences.
Output Pin
Name
Data Type
Address Range
Meaning
Top
OUT
BOOL
–
Turns ON if the ENABLE input is turned ON and the specified bit is turned OFF.