DL06 Micro PLC User Manual, 3rd Edition, Rev. E
3-25
Chapter 3: CPU Specifications and Operation
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Memory Map
With any PLC system, you generally have many different types of information to process. This
includes input device status, output device status, various timing elements, parts counts, etc. It
is important to understand how the system represents and stores the various types of data. For
example, you need to know how the system identifies input points, output points, data words,
etc. The following paragraphs discuss the various memory types used in DL06 Micro PLCs. A
memory map overview for the CPU follows the memory descriptions.
.
V-memory Locations for Discrete Memory Areas
The discrete memory area is for inputs, outputs, control relays, special relays, stages, timer status
bits and counter status bits. However, you can also access the bit data types as a V-memory
word. Each V-memory location contains 16 consecutive discrete locations. For example, the
following diagram shows how the X input points are mapped into V-memory locations.
These discrete memory areas and their corresponding V-memory ranges are listed in the
memory area table for DL06 Micro PLCs on the following pages.
X0
X1
X2
X3
X4
X5
X6
X7
X10 X11
LOGIC
K oyo
06
C0
C4
C2
X1
X3
X4
X6
X11
X13
X14
X16
X21
X23
N.C.
C1
C3
X2
X5
X7
X10
X12
X15
X17
X20
X22
X0
N.C.
AC(N) 24V
0V
N.C.
C1
C3
Y0
Y15
Y12
Y10
Y17
Y7
Y5
Y2
C0
C2
Y16
Y14
Y13
Y11
Y6
Y4
Y3
Y1
LG
G
AC(L)
D0-06DR
2.0A
OUTPUT: 6-240V
50 - 60Hz
2.0A, 6 - 27V
INPUT: 12 - 24V
3 - 15mA
Y
X
40VA
50-60Hz
PWR: 100-240V
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PORT1
PORT2
TERM
RUN STOP
PWR
RUN
CPU
TX1
RX1
TX2
RX2
X0
Discrete – On or Off, 1 bit
0
1
1 0 1 0 0 0 0 0 0 1 0 0 1 0
Word Locations – 16 bits
X0
X1
X2
X3
X4
X5
X6
X7
0
1
2
3
4
5
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8
9
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V40400
Bit #
8 Discrete (X) Input Points
Octal Numbering System
All memory locations and resources
are numbered in Octal (base 8). For
example, the diagram shows how the octal
numbering system works for the discrete
input points. Notice the octal system does
not contain any numbers with the digits 8
or 9.
Discrete and Word Locations
As you examine the different memory
types, you’ll notice two types of memory
in the DL06, discrete and word memory.
Discrete memory is one bit that can be
either a 1 or a 0. Word memory is referred
to as V-memory (variable) and is a 16-bit
location normally used to manipulate data/
numbers, store data/numbers, etc.
Some information is automatically stored
in V-memory. For example, the timer
current values are stored in V-memory.