Siemens S7-1500 Manual page 31

Diagnostics alarms
5.1 Status and error displays
Meaning of the LED displays
The tables below explain the meaning of the status and error displays.
LED RUN/ERROR
Table 5- 1 RUN/ERROR status and error displays
LED
RUN ERROR
Off Off
Flashes Off
On Off
Flashes Flashes
30
Meaning
Voltage missing or too low at backplane bus.
Module is starting up.
Module is ready.
Hardware defective.
Digital input/output module DI 32x24VDC SNK/SRC/DQ 32x24VDC/0.3A SNK BA (6ES7523-1BP50-0AA0)
Remedy
• Switch on the CPU and/or the system power
supply modules.
• Verify that the U connectors are inserted.
• Check whether too many modules are in-
serted.
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Replace the module.
Equipment Manual, 07/2020, A5E48027024-AA