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 Analog Modules<br />
3.6.5 Interrupts of Analog Modules<br />
Introduction<br />
Parameterizing<br />
interrupts<br />
Default setting<br />
Diagnostic<br />
interrupt<br />
Hardware interrupt<br />
Hardware interrupt<br />
lost<br />
3-50<br />
The interrupt characteristics of the analog modules are described in this<br />
section.<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 a 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 />
The range is defined by parameterization of an upper and a lower limit. If the<br />
process signal (e.g. temperature of an analog input module) is outside this<br />
range, the module triggers a hardware interrupt provided limit interrupt is<br />
enabled. You can determine which of the channels has triggered the interrupt<br />
with the aid of the local data of the OB 40 in the user program (see /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 (overrange/underrange of limit), this<br />
event is stored and a hardware interrupt is triggered. If a further event occurs<br />
on this channel before the hardware interrupt has been acknowledged by the<br />
CPU (OB 40 run) this event will be lost. A diagnostic interrupt ”hardware<br />
interrupt lost” is triggered in this case. The diagnostic interrupt enable must<br />
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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