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MB0-MB65535

MW0-MW65534

MD0-MD65532

Byte, Char, String**

Word, Short, BCD

DWord, Long, LBCD,

Float

Read/Write

Special Memory

(Bytes 0-29 are Read Only)

SM0.b-SM65535.b

.b is Bit Number 0-7

SMB0-SMB65535

SMW0-SMW65534

SMD0-SMD65532

Boolean

Byte, Char, String**

Word, Short, BCD

DWord, Long, LBCD,

Float

Read/Write

Sequence Control Relay (SCR) S0.b-S65535.b

.b is Bit Number 0-7

SB0-SB65535

SW0-SW65534

SD0-SD65532

Boolean

Byte, Char, String**

Word, Short, BCD

DWord, Long, LBCD,

Float

Read/Write

Variable Memory V0.b-V65535.b

.b is Bit Number 0-7

VB0-VB65535

VW0-VW65535

VD0-VD65535

Boolean

Byte, Char, String**

Word, Short, BCD

DWord, Long, LBCD,

Float

Read/Write

Timer Current Values T0-T65535* DWord, Long Read/Write

Timer Status Bit T0-T65535* Boolean Read Only

Counter Current Values (IEC) C0-C65535* Word, Short Read/Write

Counter Status Bit (IEC) C0-C65535* Boolean Read Only

Counter Current Values (SIMATIC) Z0-Z65535* Word, Short Read/Write

Counter Status Bit (SIMATIC) Z0-Z65535* Boolean Read Only

Note: C and Z access the same memory area.

High-Speed Counter HC0-HC65535* DWord, Long Read Only

*These memory types/subtypes do not support arrays.

**Byte memory types (MB) support strings. The syntax for strings is <address>.<length> where 0 < length <=

212.

***For Analog Inputs and Outputs, the address must be even (AI0, AI2, AI4, and so forth).

Notes:

1. All offsets for memory types I, Q, M, S, and SM represent a byte starting location within the specified

memory type.

2. Use caution when modifying Word, Short, DWord, and Long types. For I, Q, and F, each address starts at

a byte offset within the device. Therefore, Words MW0 and MW1 overlap at byte 1. Writing to MW0 will

also modify the value held in MW1. Similarly, DWord, and Long types can also overlap. It is recommended

that these memory types be used so that overlapping does not occur. For example, DWord MD0, MD4,

MD8, and so on can be used to prevent overlapping bytes.

Arrays

All memory types/subtypes with the exception of those marked with an asterisk support arrays. The valid syntax

for declaring an array is as follows:

<address>[rows][cols]

<address>.rows.cols

<address>,rows,cols

<address>_rows_cols

Note:

If no rows are specified, a row count of 1 is assumed.

For Word, Short, and BCD arrays, the base address + (rows * cols * 2) cannot exceed 65536. Keep in mind that

the elements of the array are words, located on a word boundary. For example, IW0[4] would return IW0, IW2,

IW4, and IW6.

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Siemens IP-Module Especificaciones Pagina 40

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