Siemens Simatic S7-1500 Handmatig - Pagina 20

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Siemens Simatic S7-1500 Handmatig
Interrupts/diagnostic alarms

5.3 Diagnostic alarms

5.3
Diagnostic alarms
Diagnostic alarms
A diagnostic alarm is output for each diagnostic event and the ERROR LED flashes on the
module. The diagnostic alarms can, for example, be read from the diagnostic buffer of the
CPU. You can evaluate the error codes with the user program.
Table 5- 4
Diagnostic alarms, their meaning and corrective measures
Diagnostic alarm
Error code
Load voltage missing 17
Wire break
6
Hardware interrupt
22
lost
20
Meaning
Supply voltage L+ of the module is
D
missing
Impedance of encoder circuit too high
D
Wire break between the module and
sensor
Channel not connected (open)
The module cannot trigger an interrupt
D
because the previous interrupt was not
acknowledged; possibly a configuration
error
Corrective measures
Connect supply voltage L+ to
module/channel
Use a different encoder type or modify
the wiring, for example, using cables with
larger cross-section
Connect the cable
Disable diagnostics
•
Connect a resistor of 25 kΩ to 45 kΩ
•
to the encoder contacts
Change interrupt processing in the
•
CPU and, if necessary, edit the
module parameters.
The error persists until the module
•
is assigned new parameters
DI 16x24VDC HF Digital Input Module (6ES7521-1BH00-0AB0)
Manual, 01/2013, A5E03485952-01