II - DCE FEL ČVUT v Praze
II - DCE FEL ČVUT v Praze
II - DCE FEL ČVUT v Praze
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SIMATIC S7 Ex Digital Modules<br />
Interrupts<br />
Parameterizing<br />
interrupts<br />
Default setting<br />
Diagnostic<br />
interrupt<br />
Hardware interrupt<br />
Hardware interrupt<br />
lost<br />
2-12<br />
The interrupt characteristics of the SM 321; DI 4 x NAMUR are described in<br />
the following.<br />
In principle, a differentiation is made between the following interrupts:<br />
Diagnostic interrupt<br />
Hardware interrupt<br />
The interrupts are parameterized with STEP 7.<br />
The interrupts are inhibited by way of default.<br />
If enabled, the module triggers a diagnostic interrupt when an fault comes or<br />
goes (e.g. wire break or short to M). Diagnostic functions inhibited by<br />
parameterization cannot trigger an interrupt. The CPU interrupts processing<br />
of the user program or low-priority classes and processes the diagnostic<br />
interrupt module (OB 82).<br />
Depending on the parameterization, the module can trigger a hardware<br />
interrupt for every channel optionally at leading, trailing or both edges of a<br />
signal change. You can determine which of the channels has triggered the<br />
interrupt from the local data of the OB 40 in the user program (refer to<br />
/235/).<br />
Active hardware interrupts trigger interrupt processing (OB 40) in the CPU,<br />
consequently the CPU interrupts processing of the user program or<br />
low-priority classes. If there are no higher priority classes pending<br />
processing, the stored interrupts (of all modules) are processed one after the<br />
other corresponding to the order in which they occurred.<br />
If an event occurred in one channel (edge change), this event is stored in the<br />
hardware interrupt register and a hardware interrupt is triggered. If a further<br />
event occurs on this channel before the hardware interrupt has been<br />
acknowledged by the CPU (OB 40 run) this event will be lost. A diagnostic<br />
interrupt ”hardware interrupt lost” is triggered in this case. The diagnostic<br />
interrupt enable must be active for this purpose.<br />
Further events on this channel are then no longer registered until interrupt<br />
processing is completed for this channel.<br />
I/O Modules with Intrinsically-Safe Signals<br />
C79000-G7076-C152-04
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