Siemens SIMATIC S7-1200

Fail-Safe signal module (SM) diagnostics
6.2 Fault diagnostics
S7-1200 Functional Safety Manual
120 Manual, 02/2015, A5E03470344-AA
6.2.1
Diagnostics by LED display
The fail-safe SMs have the following types of LEDs:
●
Module DIAG LED:
– Dual color (green / red) LED indicates the operating state and fault status of the
module.
– Only a single DIAG LED on each fail-safe SM
– The DIAG LED is green ON if no fault is present and the fail-safe SM is configured.
– The DIAG LED is flashing green if no fault is present and the fail-safe SM is not
configured.
– The DIAG LED is flashing red as soon as a diagnostic function is triggered by the fail-
safe SM.
– The DIAG LED alternates between flashing red and green when a reintegratable
module fault has been cleared, but not yet acknowledged.
– The DIAG LED continues to flash red when a reintegratable channel fault has been
cleared, but not yet acknowledged.
– The DIAG LED is green ON when all faults have been eliminated and acknowledged.
●
Input/Output Status LED
:
– Green LED for each input shows the input/output state during normal operation
.
●
Input/Output Fault LED
:
– Red LED for each input/output indicates a channel error. If any channel error is
present, the DIAG LED is flashing red.
– The DIAG LED alternates between flashing red and green when a reintegratable
channel fault has been cleared, but not yet acknowledged.