STEP 5 Operations
S5-100U
Conditional Block End “BEC”
The “BEC” operation causes a return within a block if the previous condition has been satisfied
(RLO = 1).
Otherwise, linear program scanning is continued with RLO “1”.
Example:
Scanning of program block FB20 is terminated if the RLO = “1”.
.
.
.
.
A
I
0.0
BEC
.
.
.
.
The “BEC” statement causes program
scanning to return to program block
PB7 from function block FB20 if input
I 0.0 is “1”.
STL
Explanation
Program Sequence
PB7
FB20
A I 0.0
BEC
JU FB20
8.1.9
Other Operations
Table 8-9 lists other basic operations. Explanations follow the table.
Table 8-9. Other Operations
Operation
Meaning
Operand
ID
STP
Stop at the end of program scanning (in OB1)
Current program scanning is terminated.
The PIQ is read out. Then the PLC goes into the STOP mode.
NOP 0
“No” Operation
Sixteen bits in the RAM are set to “0”.
NOP 1
“No” Operation
Sixteen bits in the RAM are set to “1”.
BLD
Display Generation Operation
“BLD” means a display generation operation for the programmer.
Parameter
130, 131, 132, 133, 255
Note
These operations can be programmed in STL form only.
8-38
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Содержание SIMATIC S5-100U
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