Plc memory areas – Omron CS1W-ETN21 User Manual

Page 183

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158

Socket Applications

Section 7-2

Parameters

Specifies the parameters for the command code. Parameters depend on the
command being executed; for details, refer to the following pages.

7-2-2

PLC Memory Areas

The memory areas of the PLC that can be specified for results storage when
executing commands from the PC are listed in the table below. The Variable
type
is set in the first byte of the results storage area. The remaining three
bytes contain the address for communications.

Addresses in the Addresses for communications column are not the same as
the actual memory addresses.

Note

The variable types (area designations) given in parentheses can also be
used, allowing CV-series or CVM1 programs to be more easily corrected for
use with CS/CJ-series PLCs.

Word and Bit Addresses

Three bytes of data are used to express data memory addresses of PLCs.
The most significant two bytes give the word address and the least significant
byte gives the bit number between 00 and 15.

The word address combined with the bit number expresses the bit address.
The bit number is always 00 because Ethernet Units can handle only word
data, i.e., individual bits cannot be addressed.

Word addresses for specific memory area words can be calculated by con-
verting the normal decimal word address to hexadecimal and adding it to the
first word in the Addresses for communications column in the above table. For
example, the address for communications for D00200 would be 0000 (from
above table) plus C8 (decimal 200 converted to hexadecimal), or 00C8.

Memory

area

Data type

Word addresses

Addresses for

communications

Variable

type

Bytes

Bit Areas

Current
value of
word

CIO

CIO 0000 to CIO 6143

000000 to 17FF00

B0 (80)*

2

HR

H000 to H511

000000 to 01FF00

B2

A

A448 to A959

01C000 to 03BF00

B3

DM Area

DM

D00000 to D32767

000000 to 7FFF00

82

2

EM Area

Bank 0

E0_E00000 to E0_E32767

000000 to 7FFF00

A0 (90)*

2

Bank 1

E1_E00000 to E1_E32767

000000 to 7FFF00

A1 (91)*

Bank 2

E2_E00000 to E2_E32767

000000 to 7FFF00

A2 (92)*

Bank 3

E3_E00000 to E3_E32767

000000 to 7FFF00

A3 (93)*

Bank 4

E4_E00000 to E4_E32767

000000 to 7FFF00

A4 (94)*

Bank 5

E5_E00000 to E5_E32767

000000 to 7FFF00

A5 (95)*

Bank 6

E6_E00000 to E6_E32767

000000 to 7FFF00

A6 (96)*

Bank 7

E7_E00000 to E7_E32767

000000 to 7FFF00

A7 (97)*

Bank 8

E8_E00000 to E8_E32767

000000 to 7FFF00

A8

2

Bank 9

E9_E00000 to E9_E32767

000000 to 7FFF00

A9

2

Bank A

EA_E00000 to EA_E32767

000000 to 7FFF00

AA

2

Bank B

EB_E00000 to EB_E32767

000000 to 7FFF00

AB

2

Bank C

EC_E00000 to EC_E32767

000000 to 7FFF00

AC

2

Current bank

E00000 to E32767

000000 to 7FFF00

98

2

Specifies the bit position between 00 and 0F (0 to 15) for bit data.

Specifies the address of the corresponding word.

Variable type

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