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5 function call-ups, 6 bit-wise access to variables, 2 operators – NORD Drivesystems BU0550 User Manual

Page 22: 1 loading and storage operators, 2 operators 3.2.1

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PLC logic for NORD SK 54xE frequency inverters

22

BU 0550 GB-0813

3.1.5

Function call-ups

At present, the Editor only supports the following list form for function call-ups. The function CTD is called up
via the instance I_CTD. The results are saved in variables. The meaning of the functions used below is
described in further detail later in the manual.

LD 10000

ST I_CTD.PV

LD LoadNewVar

ST I_CTD.LD

LD TRUE

ST I_CTD.CD

CAL I_CTD

LD I_CTD.Q

ST ResultVar

LD I_CTD.CV

ST CurrentCountVar

3.1.6

Bit-wise access to variables

A simplified form is possible for access to a bit from a variable or a process variable.

Command

Meaning

LD Var1.0

Loads Bit 0 of Var1 into the AE

ST Var1.7

Stores the AE on Bit 7 of Var1

EQ Var1.4

Compares the AE with Bit 4 of Var1

Table 4 Bit-wise access to variables

3.2 Operators

3.2.1

Loading and storage operators

Operator

Explanation

LD

Load

LDN

Load negated (BOOL)

ST

Memory

STN

Memory negated (BOOL)

Table 5 Overview of loading and storage operations