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141
Data Memory Area (D)
Section 4-10
4-10 Data Memory Area (D)
CPU Units with 30 or 40 I/O points: D0 to D32767
CPU Units with 14 or 20 I/O points: D0 to D9999 and D32000 to D32767
This data area is used for general data storage and manipulation and is
accessible only by word.
Data in the DM Area is retained when the PLC’s power is cycled or the PLC’s
operating mode is changed from PROGRAM mode to RUN/MONITOR mode
or vice-versa.
Although bits in the DM Area cannot be accessed directly, the status of these
bits can be accessed with the BIT TEST instructions, TST(350) and
TSTN(351).
Forcing Bit Status
Bits in the DM Area cannot be force-set or force-reset.
Indirect Addressing
Words in the DM Area can be indirectly addressed in two ways: binary-mode
and BCD-mode.
Binary-mode Addressing (@D)
When a “@” character is input before a DM address, the content of that DM
word is treated as binary and the instruction will operate on the DM word at
that binary address. The entire DM Area (D0 to D32767) can be indirectly
addressed with hexadecimal values 0000 to 7FFF.
BCD-mode Addressing (
*
D)
When a “
*
” character is input before a DM address, the content of that DM
word is treated as BCD and the instruction will operate on the DM word at that
BCD address. Only part of the DM Area (D0 to D09999) can be indirectly
addressed with BCD values 0000 to 9999.
Note
(1) If an address between D10000 and D31999 is specified as an operand
for a CPU Unit with 14 or 20 I/O Points, an illegal area access error will
occur.
D32200
D32000
D32399
D9999
D0
D32199
D32399
D32200
D32199
D32767
D32400
D0
D32767
D32400
D10000
D31999
CPU Unit with 30 or 40 I/O Points
CPU Unit with 14 or 20 I/O Points
DM Fixed Allocation
Words for Modbus-RTU
Easy Master
DM Fixed Allocation
Words for Modbus-RTU
Easy Master
Do not use.
@D100
D256
0100
▲
Address actually used.
*
D100
D100
0100
▲
Address actually used.
Summary of Contents for CP1L - 12-2007
Page 3: ...iv...
Page 9: ...x...
Page 13: ...xiv TABLE OF CONTENTS...
Page 21: ...xxii...
Page 33: ...xxxiv Conformance to EC Directives 6...
Page 65: ...32 Function Blocks Section 1 5...
Page 428: ...395 Clock Section 6 9...
Page 429: ...396 Clock Section 6 9...
Page 523: ...488 Troubleshooting Unit Errors Section 9 4...
Page 531: ...496 Replacing User serviceable Parts Section 10 2...
Page 563: ...528 Auxiliary Area Allocations by Function Appendix C...
Page 611: ...576 Auxiliary Area Allocations by Address Appendix D...
Page 638: ...603 Connections to Serial Communications Option Boards Appendix F Connecting to Unit...
Page 639: ...604 Connections to Serial Communications Option Boards Appendix F...
Page 669: ...634 Index...
Page 671: ...636 Revision History...