Siemens v1.0 Wartungshandbuch Seite 101

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Extended example
3.2 Expanding the program
STEP 7 Basic V10.5
Getting Started, 12/2009, A5E02651459-01
101
Result
You have programmed the pasteurization progress as another condition for starting the
conveyor.
3.2.2.4 Control conveyor
Introduction
The following steps show you how to set the conveyor in motion depending on the
programmed conditions. To control the conveyor, use the "Set/reset flip-flop" instruction.
Set/reset flip-flop
The following figure shows the box of the "Set/reset flip-flop" instruction.
2SHUDQG!
65
5
4
6
You can use this instruction to set or reset the bit of a specified operand depending on the
signal state on the S and R1 inputs of the instruction.
If the signal state is "1" at the S input and "0" at the R1 input, the specified operand will
be set to "1".
If the signal state at the S input is "0" and at the R1 input "1", the specified operand will
be reset to "0" because the input R1 has a higher priority than input S.
When the signal state is "1" on both inputs S and R1, the signal state of the specified
operand is reset to "0".
Requirements
The organization block "Main [OB1]" is open.
The conditions described in the sections "Querying the status of the machine (Page 95)",
"Querying the position of the bottle and the status of the heating
cha
mber (Page 97)" and
"Query pasteurization progress (Page 99)" have been programmed.
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