Siemens SIMATIC ET 200AL, System Manual

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Interrupts/diagnostics alarms
5.2 Interrupts
Analog input module AI 4xRTD/TC 4xM12 (6ES7144-5KD50-0BA0)
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Equipment Manual, 08/2021, A5E48753535-AB
5.2 Interrupts
The AI 4xRTD/TC 4xM12 analog input module supports diagnostic and hardware interrupts.
Diagnostic interrupt
The table below shows the events for which the analog input module returns a diagnostic
interrupt, depending on the parameter assignment.
Table 5- 3 Diagnostic interrupts
Measure-
ment type
Diagnostics
Wire
break
High limit
violated
Low limit
violated
Error Parame-
ter as-
signment
error
Reference
channel
error
Hardware
interrupt
lost
Voltage - x x x x - x
Resistance x x - x x - x
Thermal
resistor
x x x x x - x
Thermocou-
ple
x x x x x x x
Hardware interrupt
The analog input module generates a hardware interrupt with the following events:
•
Low limit 1 violated
• High limit 1 violated
• Low limit 2 violated
• High limit 2 violated
Detailed information on the event is available in the hardware interrupt organization block
with the instruction "RALRM" (Read additional interrupt information) and in the STEP 7 online
help.
The start information of the organization block includes information on which channel of the
analog input module triggered the hardware interrupt.
Note
High limit violation of 2 limits
If two limits are violated at the same time, limit 1 is always signaled first, followed by limit 2.