Siemens SIMATIC S7-1500 Manual page 32

Meaning of the LED displays
The following table explains the meaning of the status and error displays. Remedial
measures for diagnostic alarms can be found in section Diagnostic alarms (Page 33).
RUN and ERROR LED
Table 5- 1 Status and error displays RUN and ERROR
LED
RUN ERROR
Off Off
Off
Flashes
On Off
On
Flashes
Flashes Flashes
LED MAINT
Table 5- 2 MAINT status display
LED MAINT
Off
On
LED PWR
Table 5- 3 PWR status display
LED PWR
Off
On
DQ 8x24VDC/2A HF Digital Output Module (6ES7522-1BF00-0AB0)
Manual, 06/2018, A5E03485650-AF
Meaning
Voltage missing or too low at backplane bus.
The module starts and flashes until the valid
parameter assignment is set.
Module is configured.
Indicates module errors (at least one error at
one channel, e.g., short-circuit to ground).
Hardware defective.
Meaning
0 = No maintenance interrupt is pending.
1 = The maintenance interrupt "Limit value
warning" is pending.
Meaning
Supply voltage L+ too low or missing.
Supply voltage L+ is present and OK.
Interrupts/diagnostics alarms
5.1 Status and error displays
Solution
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.
---
Evaluate the diagnostics data and eliminate the
error (e.g., check the cables).
Replace the module.
Solution
---
---
Solution
Check supply voltage L+.
---
31