NORD Drivesystems BU0550 - Manual (Page 23)

3 AWL (Instruction List, IL)
BU 0550 GB-0813 23
3.2.1.1 LD
Loads a constant or a variable into the AE or into the accumulator
BOOL BYTE INT DINT
Possible data types X X X X
Commands Explanation
LD 10 Loads 10 as BYTE
LD -1000 Loads -1000 as BYTE
LD Value1 Loads variable Value 1
Table 6 LD
3.2.1.2 LDN
Loads the negative value of a boolean variable into the AE
BOOL BYTE INT DINT
Possible data types X
Commands Explanation
LDN Value1 Value1 = TRUE

AE = FALSE
ST Value2 Save to Value2 = FALSE
Table 7 LDN
3.2.1.3 ST
Saves the content of the AE or accumulator to a variable. The variable to be saved must match the
previously loaded and processed data type.
BOOL BYTE INT DINT
Possible data types X X X X
Commands Explanation
LD 100 Loads the value 100
ST Value2 Accumulator content 100 is saved in Value1
Table 8 ST
3.2.1.4 STN
Saves the content of the AE to a variable and negates it. The variable to be saved must match the
previously loaded and processed data type.
BOOL BYTE INT DINT
Possible data types X
Commands Explanation
LD Value1 Value1 = TRUE

AE = TRUE
STN Value2 Save to Value2 = FALSE
Table 9 STN