Interrupt Processing
S5-115U Manual
9.3.5
Programming Example for Interrupt Processing
Task
A tray is to be accurately positioned at two points:
Position 1 is determined by terminating switch 12.
When the signal status of limit switch 1 changes from 0 to 1 (positive edge), drive 1 is to be
switched off.
Position 2 is determined by limit switch 2.
When the signal status of limit switch 2 changes from 0 to 1 (negative edge), drive 2 is to be
switched off.
The status of the limit switches is to be indicated by two LEDs:
LED 1 for "Signal status of limit switch 1"
LED 2 for "Signal status of limit switch 2"
Implementation
The 434-7 module has starting address 8. The IM 306 is set to 16 channels for the 434-7.
Limit switch 1 is assigned to channel 0 of the module, limit switch 2 is assigned to channel 1 of the
module.
The OB21 and OB22 restart programs have the task of initializing the module:
STL OB21/OB22
Meaning
L KM 0000 0011 0000 0010
T PW 8
BE
Initialization of the interrupt inputs:
Enable channel 0: positive edge
Enable channel 1: negative edge
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The interrupts are evaluated in OB2:
Drive 1 is switched off by resetting output Q 0.0
Drive 2 is switched off by resetting output Q 0.1.
The status of the LEDs is updated in the cyclic program section:
When output Q 1.0 is set, LED 1 lights up
When output Q 1.1 is set, LED 2 lights up.
9-8
EWA 4NEB 811 6130-02b
Содержание SIMATIC S5-115U
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