GE PACSystems RX7i

Chapter 4. Ladder Diagram (LD) Programming
GFK-2950C February 2018 143
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
Allowed Operands
Optional
Length (??)
The number of words to clear, starting at the IN location.
1  Length  256 words.
Constant
No
IN
The first WORD of the memory block to clear to 0.
All except %S and data flow.
No
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.