NORD Drivesystems BU0550 - Manual (Page 22)

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