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Introduction to IEC 61131-3 programming

Appendix

DDS-IEC61131 EN 2.0

6.2.4 Identifier

The identifier is the proper name of a variable and should indicate the application or function of the

variable.

• Identifiers always start with a capital letter.

• If an identifier is assembled from several ”words”, then each ”word” must start with a capital

letter.

• All other letters are written in lower case.

Examples of identifiers:

JogValue

NumberOfValues

CurrentSelectedJogValue

6.2.5 Indication of the signal type

In general, it is possible to assign a certain signal type to the inputs and outputs of Lenze function

blocks/system blocks. There are digital, analog, position and speed signals.

A corresponding ending (preceded by an underscore) is added to the identifier of the input/output

variable to indicate the signal type.

Signal type Ending Memory Normalization

(external value

≡

≡≡

≡ internal value)

designation

analog _a (analog) 16 bits 100 % ≡ 16384 H

digital _b (binar y) G

Phase-angle difference or

speed

_v (velocity) 16 bits 15000 rpm ≡ 16384 F

Phase-angle or position _p (position) 32 bits 1 motor revolution ≡ 65535 E

6.2.6 Examples of variable identifiers

Variable identifier Assigned

system block

Variable type Data type Signal type Application/function

g_anFixS etSpeedValue_a - VAR_GLOBAL Array (Integer) analog Array for fixed setpoints

CAN2_nOutW1_a CAN2_IO - Integer analog Output word 1 of CAN2_OUT

AOUT1_nOut_a AOUT1 - Integer analog Output analog signal

bQSP_b - - Bool binary

(TRUE/F ALSE)

Activation of quick stop

byFunction - - By te - Function selection

dnIn1_p - - Double Integer position Phase input signal 1

nVp - - Integer - Gain

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