Diagnostics alarms
5.1 Status and error displays
Digital input module DI 32x24VDC BA (6ES7521-1BL10-0AA0)
Manual, 12/2016, A5E32363711-AD
19
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
Meaning
Remedy
RUN
ERROR
Off
Off
Voltage missing or too low at backplane bus.
•
Switch on the CPU and/or the system pow-
er supply modules.
•
Verify that the U connectors are inserted.
•
Check to see if too many modules are in-
serted.
Flashes
Off
Module is starting up.
---
On
Off
Module is ready.
Flashes
Flashes
Hardware defective.
Replace the module.
LED CHx
Table 5- 2
CHx status display
LED CHx
Meaning
Remedy
Off
0 = Status of the input signal.
---
On
1 = Status of the input signal.
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Summary of Contents for 6ES7521-1BL00-0AA0
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