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Table Data Processing Instructions Section 3-16
3-16-18 STACK DATA DELETE: SDEL(642)
Purpose Deletes the data element at the specified location in the stack, outputs that
data to the specified destination word, and shifts the remaining the data in the
stack upward. The offset value indicates the location of the desired data ele-
ment (how many data elements before the current pointer position).
Ladder Symbol
Variations
Applicable Program Areas
Operands TB through TB+3: Stack control words
The first four words of the stack contain the PLC memory address of the last
word in the stack and the stack pointer (the PLC memory address of the next
available word in the stack.)
TB+4 through TB+(N–1): Data storage region
The remainder of the stack is used to store data.
SDEL(642)
TB
C
D
TB: First stack address
C: Offset value
D: Destination word
Variations Executed Each Cycle for ON Condition SDEL(642)
Executed Once for Upward Differentiation @SDEL(642)
Executed Once for Downward Differentiation Not supported.
Immediate Refreshing Specification Not supported.
Block program areas Step program areas Subroutines Interrupt tasks
OK OK OK OK
TB
0
15
TB+1
0
15
TB+2
0
15
TB+3
0
15
PLC memory address of the last
word in the stack (rightmost 4 digits)
PLC memory address of the last
word in the stack (leftmost 4 digits)
Stack pointer (rightmost 4 digits)
(Initial value is the rightmost 4 digits of
the PLC memory address for TB+4.)
Stack pointer (leftmost 4 digits)
(Initial value is the leftmost 4 digits of
the PLC memory address for TB+4.)
15 0
TB+4
TB+(N–1)
Data storage region
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