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4.8.3
Block Clear
When the Block Clear (BLKCLR_WORD) function receives power flow, it fills the specified
block of data with zeroes, beginning at the reference specified by IN. When the data to be
cleared is from BOOL (discrete) memory (%I, %Q, %M, %G, or %T), the transition
information associated with the references is updated. BLKCLR_WORD passes power to
the right whenever it receives power.
Note: The input parameter IN is not included in coil checking.
Operands
Parameter Description
Length (??) The number of words to clear, starting at the IN location.
1 Length 256 words.
IN
The first WORD of the memory block to clear to 0.
Example
At power-up, 32 words of %Q memory (512 points) beginning at %Q0001 are filled with zeroes. The
transition information associated with these references will also be updated.
GFK-2950C
Chapter 4. Ladder Diagram (LD) Programming
February 2018
Allowed Operands
Constant
All except %S and data flow.
Optional
No
No
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