Siemens SIMATIC S7-1500 Manual page 22

Interrupts/diagnostics alarms
5.1 Status and error displays
Meaning of the LED displays
The following tables explain the meaning of the status and error displays. Corrective
measures for diagnostics alarms can be found in the section Diagnostics alarms (Page 23).
RUN and ERROR LED
Table 5- 1 RUN and ERROR status and error displays
LED
RUN ERROR
Off Off
Off
Flashes
On Off
On
Flashes
Flashes Flashes
PWR LED
Table 5- 2 PWR status display
LED PWR
Off
On
CHx LED
Table 5- 3 CHx status display
LED CHx
Off
On
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Meaning
Voltage missing or too low at backplane bus
The module starts and flashes until the valid
parameter assignment is set.
Module parameters assigned
Indicates module error because supply voltage
L+ is missing
Hardware defective
Meaning
Supply voltage L+ too low or missing
Supply voltage L+ is present and OK
Meaning
0 = Status of the output signal
1 = Status of the output signal
Switch on the CPU and/or the system pow-
•
er supply modules.
Verify that the U connectors are inserted.
•
Check whether too many modules are in-
•
serted.
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Check the supply voltage L+ at the terminals 19
and 20 or 39 and 40.
Replace the module.
Check the supply voltage L+ at the terminals 19
and 20 or 39 and 40.
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Digital output module DQ 16x230VAC/2A ST Relay (6ES7522-5HH00-0AB0)
Solution
Solution
Solution
Manual, 03/2015, A5E34934019-AA