Siemens Simatic S7-1500 - Page 42

Interrupts/diagnostics alarms
5.1 Status and error displays
Analog Input Module AI 8xU/R/RTD/TC HF (6ES7531-7PF00-0AB0)
42 Manual, 09/2016, A5E36647959-AB
Meaning of the LED displays
The following tables explain the meaning of the status and error displays. Remedial
measures for diagnostic alarms can be found in section Diagnostic alarms (Page 45).
RUN and ERROR LED
Table 5- 1 Status and error displays RUN and ERROR
LEDs
Meaning
Remedy
RUN
ERROR
Off Off
Voltage missing or too low at backplane bus.
• Switch on the CPU and/or the system power
supply modules.
• Verify that the U connectors are inserted.
• Check whether too many modules are insert-
ed.
Flashes
Off
The module starts and flashes until the valid
parameter assignment is set.
---
On Off
Module is configured.
On
Flashes
Indicates module errors (at least one error at
one channel, e.g., wire break).
Evaluate the diagnostics data and eliminate the
error (e.g., wire break).
Flashes
Flashes
Hardware defective. Replace the module.
PWR LED
Table 5- 2 PWR status display
LED PWR
Meaning
Remedy
Off
Supply voltage L+ to module too low or missing Check supply voltage L+.
On
Supply voltage L+ is present and OK. ---
CHx LED
Table 5- 3 CHx status display
LED CHx
Meaning
Remedy
Off
Channel disabled ---
On
Channel configured and OK. ---
On
Channel is configured (channel error pending).
Diagnostic alarm: e.g. wire break
Check the wiring.
Disable diagnostics.