Omron CP - PROGRAMMING MANUAL 05-2007 Programming Manual page 637

Table Data Processing Instructions
Operand Specifications
Description
604
Area
CIO Area
Work Area
Holding Bit Area
Auxiliary Bit Area
Timer Area
Counter Area
DM Area
Indirect DM addresses
in binary
Indirect DM addresses
in BCD
Constants
Data Registers
Index Registers
Indirect addressing
using Index Registers
SREAD(639) reads the data from the address specified by the stack pointer
(TB+3 and TB+2) minus the offset value in C. SREAD(639) does not change
the data in the stack or the stack pointer.
TB
TB+1
TB+2
TB+3
TB+4
Pointer
Offset value Last word
in stack
C
SREAD(639) can be used to read the data for an item currently on a conveyor.
The position of the desired item is simply the number of items back (the offset
value) from the most recent item added to the conveyor.
TB
CIO 0 to CIO 6143
W0 to W511
H0 to H511
A448 to A959 A0 to A959
T0000 to T4095
C0000 to C4095
D0 to D32767
@ D0 to @ D32767
*D0 to *D32767
#0001 to #FFFB
--- DR0 to DR15
---
,IR0 to ,IR15
–2048 to +2047 ,IR0 to –2048 to +2047 ,IR15
DR0 to DR15, IR0 to IR15
,IR0+(++) to ,IR15+(++)
,–(– –)IR0 to,
–(– –)IR15
PLC memory
Stack
address
n
m
A
The data (A) is
not changed.
B
C
m
n
Reads the data (A) without
changing the stack pointer.
D
Reads the data (A) in the specified
word and outputs that data to D.
The address of the desired word is
calculated by subtracting the offset
value from the stack pointer address.
Section 3-16
C D
A448 to A959
A