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Introduction to IEC 61131-3 programming

Appendix

L DDS-IEC61131 EN 2.0

6.2.2 Indication of the variable type

The indication of the variable type is optional. It can be used to indicate the variable type in the

identifier:

Variable type entry (optional) Meaning

I_ VAR_INPUT

Q_ V AR_OUTPUT

IQ_ V AR_IN_OUT

R_ VAR RET AIN

C_ VAR CONSTANT

CR_ VAR CONST ANT RETAIN

g_ VAR_GLOBAL

gR_ V AR_GLOBAL RETAIN

gC_ VAR_GLOBAL CONSTANT

gCR_ VAR_GLOBAL CONSTANT RETAIN

6.2.3 Indication of the data type

The data type entry provides information about the data type of a variable:

Data type entry Meaning

b Bool

by Byte

n Integer

w Word

dn Double Integer

dw Double Word

s String

f Real (Float)

sn Short Integer

t Time

un Unsigned Integer

udn Unsigned Double Integer

usn Unsigned Short Integer

If the variable is an array or a pointer, this will be indicated before thedatatypeentry:

Data type entry (optional) Meaning

a Array (combined type), field

p Pointer

Examples of data type entries:

aby

(ArrayofdatatypeByte)

(Double Integer)

pdn

(Pointer to Double Integer)

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