Omron CP - PROGRAMMING MANUAL 05-2007 Programming Manual page 601

Table Data Processing Instructions
Variations
Applicable Program Areas
Operands
Note
Operand Specifications
568
Variations Executed Each Cycle for ON Condition
Executed Once for Upward Differentiation
Executed Once for Downward Differentiation Not supported.
Immediate Refreshing Specification
Block program areas
OK OK
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
word to be overwritten by PUSH(632)).
15
TB
PLC memory address of the last
word in the stack (rightmost 4 digits)
15
TB+1
PLC memory address of the last
word in the stack (leftmost 4 digits)
15
TB+2
Stack pointer (rightmost 4 digits)
15
TB+3
Stack pointer (leftmost 4 digits)
TB+4 through TB+(N–1): Data storage region
The remainder of the stack is used to store data.
15
Data storage region
TB+4
---
TB+(N–1)
(1) The initial value of the stack pointer is always the PLC memory address
of TB+4.
(2) TB and TB+(N–1) must be in the same data area.
Area
CIO Area
Work Area
Holding Bit Area
Auxiliary Bit Area
Timer Area
Counter Area
Step program areas Subroutines
OK
0
0
0
0
0
TB
CIO 0 to CIO 6143
W0 to W511
H0 to H511
A448 to A959
T0000 to T4095
C0000 to C4095
Section 3-16
SSET(630)
@SSET(630)
Not supported.
Interrupt tasks
OK
N
A0 to A959