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Drive PLC Developer Studio

IEC 61131-3 Operands

13-5

l DDS EN 2.3

Furthermore:

• Case sensitivity is not an option for variables.

(Example: VAR1, Var1 and var1 are not different variables)

• Underscores in an identifier are significant.

(Example: A_BCD and AB_CD are interpreted as different identifiers.)

• Multiple successive underscores at the beginning of or within an identifier are not allowed.

• The first 32 characters are significant.

13.3 Addresses

13.3.1 Address

For a declaration, variables can be assigned to a physical memory location (PLC address) by means

of the keyword AT.

The address specification structure is established with the help of special character lines.

The character sequence starts with a ”%” followed by a range prefix and a prefix (data type) for the

size. It ends with a sequence of numbers that specify the direct memory location.

The following range prefixes are supported:

I Input

Q Output

M Flag (internal memory)

The following size prefixes are supported:

X Single bit

None Optional

B Byte (8 bits)

W Word (16 bits)

D Double word (32 bits)

Inputs/outputs:

%IX0.0.0

Character for physical address

Range prefix

Data type

Module number

Word address

Bit address

Module number

The module number specifies the automation system module (system organization unit) to be

approached.

Examples:

%QX0.0.2 Output bit 2

%IW0.0.1 Input bit 1

%MB7 Flag byte 7

%MW1 Flag word 1

%MD3 Flag double word 3

%MX1.2 Third flag bit in flag word 1

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