Siemens v1.0 Service Manual Page 94

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Extended example
3.2 Expanding the program
STEP 7 Basic V10.5
94 Getting Started, 12/2009, A5E02651459-01
Result
You have declared the tags that you need to expand the program. The defined tags are
listed in the PLC tag table.
The following table provides an overview of all previously defined tags and the meaning of
the respective tag values:
Name Data type Address Function Meaning of the tag values
ON_OFF_Switch BOOL M0.0 Pushbutton switch
1: The machine is switched
on.
0: The machine is switched
off.
ON BOOL M0.1 Switching on the
machine
1: The machine is switched
on.
0: No effect
OFF BOOL M0.2 Switching off the
machine
1: The machine is switched
off.
0: No effect
LS_1 BOOL M1.0 Light barrier for
detecting the bottle
position at the start
of the conveyor
1: The light barrier 1 is
activated.
0: The light barrier 1 is
deactivated.
LS_2 BOOL M1.1 Light barrier for
detecting the bottle
position in the
heating chamber
1: The light barrier 2 is
activated.
0: The light barrier 2 is
deactivated.
LS_3 BOOL M1.2 Light barrier for
detecting the bottle
position at the end
of the conveyor
1: The light barrier 3 is
activated.
0: The light barrier 3 is
deactivated.
conveyor_drive_ON_
OFF
BOOL M0.3 Operating mode of
the conveyor
1: The conveyor is put into
motion.
0: The conveyor is stopped.
chamber_ON_OFF BOOL M0.4 Operating mode of
the heating
chamber
1: The heating chamber is
switched on.
0: The heating chamber is
switched off.
milk_pasteurized BOOL M0.5 Status of the
pasteurization
process
1: The milk has been
pasteurized.
0: The milk has not yet been
pasteurized.
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