Siemens SIMATIC ET 200SP Manual page 123

Diagnostic alarms
When a TM Pulse 2x24V error event triggers a diagnostic alarm, the following happens:
● The DIAG light flashes red when a diagnostics alarm is pending. Once you have
remedied the error, the DIAG light changes to green.
● The diagnostics are displayed as plain text in the STEP 7 (TIA Portal) online and
diagnostics view.
● Options for the reaction of a CPU running your control program
– CPU goes to STOP and interrupts processing of the user program. The diagnostic
– CPU remains in RUN even if no diagnostic interrupt in present in the CPU. The
● Detailed information on the error event is available through execution of the RALRM (read
alarm information) program instruction
Diagnostic configuration options
If a short-circuit or overload occurs on the 24 V DC sensor supply or digital output, the
TM Pulse 2x24V generates a diagnostic message for the connected CPU/master. During the
TM Pulse 2x24V device configuration, you must enable a channel's Group diagnostics and
Diagnostics DQA / Diagnostics DQB parameters to enable the corresponding diagnostic
messages.
See also TIA portal Diagnostics configuration (Page 105)
Configuration parameter
Group diagnostics
Diagnostics DQA
Diagnostics DQB
Technology module TM Pulse 2x24V (6ES7138‑6DB00‑0BB1)
Manual, 09/2015, A5E35061186-AA
interrupt OB (for example, OB 82) is called. The event that triggered the interrupt is
written in the start information of the diagnostic interrupt OB.
technology module continues working unchanged if this is possible, while the error
exists.
Meaning
When Group diagnostics is enabled, the
TM Pulse 2x24V generates a diagnostic message
for the CPU/master in the following cases:
Supply voltage error
•
Short-circuit on 24 V DC sensor supply
•
Over-temperature
•
The TM Pulse 2x24V detects a short-circuit/overload
on the DQn.A digital output when Diagnostics DQA
is enabled.
The TM Pulse 2x24V detects a short-circuit/overload
of the DQn.B digital output when Diagnostics DQB is
enabled.
Interrupts/diagnostic messages
7.3 Error detection and diagnostics
Default
Disabled
Enabled
Enabled
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