Siemens SIMATIC ET 200SP Manual page 118

Interrupts/diagnostic messages
7.1 Status and error displays
LED status display
The following tables explain the meaning of the status and error displays. Refer to Error
correction and diagnostics (Page 122) for details.
Table 7- 1 DIAG LED
DIAG LED
Backplane bus supply of the ET 200SP not OK
Off
Technology Module not configured
Flashes green
Technology Module configured and no module error exists
On green
Technology Module configured and module diagnostics (at least
one error pending)
Flashes red
Note:
Note
The DIAG LED only shows an error if the Diagnostic alarm is activated during device
configuration. By default, the Diagnostic alarm is not activated.
Table 7- 2 PWR and 24 V DC LED status
LEDs
PWR 24 V DC
Off Off
On green On green
On green Off
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Meaning
Meaning
No supply voltage
Supply voltage is present and OK
Short-circuit or overload at the sensor supply or
supply voltage too low
To correct or avoid errors
Check or switch On the supply voltage of the head
station. Ensure the TM Pulse2x24V is correctly
inserted in the BaseUnit.
Evaluate the diagnostic alarms and eliminate the
error.
To correct or avoid errors
Check the external 24 V DC power supply
•
voltage connected between L+ and M.
Check sensor wiring.
•
Check the loads connected to the sensor
•
supply.
Check the supply voltage.
•
Technology module TM Pulse 2x24V (6ES7138‑6DB00‑0BB1)
Manual, 09/2015, A5E35061186-AA