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II - DCE FEL ČVUT v Praze

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Interrupts<br />

Parameterizing<br />

interrupts<br />

Default setting<br />

Diagnostic<br />

interrupt<br />

Influence of<br />

supply voltage and<br />

operating status<br />

I/O Modules with Intrinsically-Safe Signals<br />

C79000-G7076-C152-04<br />

The digital output can trigger a diagnostic interrupt.<br />

Interrupts are parameterized with STEP 7.<br />

The interrupts are inhibited as the default.<br />

If enabled, the module triggers a diagnostic interrupt when a fault is<br />

recognized or is no longer applicable (e.g. short to M). diagnostic functions<br />

inhibited by parameterization cannot trigger an interrupt. The CPU interrupts<br />

processing of the user program or low-priority classes and processes the<br />

diagnostic interrupt module (OB 82).<br />

The output values are dependent on the supply voltages and CPU operating<br />

status.<br />

Table 2-13 provides an overview of these dependencies.<br />

Table 2-13 Dependencies of output values on the CPU operating status and supply<br />

voltage L+ of SM 322; DO 4 x 24V/10mA and<br />

SM 322; DO 4 x 15V/20mA<br />

Operating status<br />

CPU<br />

Supply voltage L+ at<br />

digital module<br />

SIMATIC S7 Ex Digital Modules<br />

POWER ON RUN L+ applied CPU value<br />

L+ not applied 0-signal<br />

Output value of digital<br />

module<br />

STOP L+ applied Substitute value / last<br />

value<br />

Substitute value for<br />

0-signal is default setting<br />

L+ not applied 0-signal<br />

POWER OFF – L+ applied 0-signal<br />

L+ not applied 0-signal<br />

Failure of the supply voltage in the SM 322; DO 4 x 24V/10mA is always<br />

indicated by the SF LED on the front of the module and additionally entered<br />

in diagnostics.<br />

2-23

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