Diagnostics By Led Display - Siemens SIMATIC S7 Functional Safety Manual

Fail-Safe signal module (SM) diagnostics
6.2 Fault diagnostics
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
– 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
– The DIAG LED is flashing red as soon as a diagnostic function is triggered by the fail-
– The DIAG LED alternates between flashing red and green when a reintegratable
– The DIAG LED continues to flash red when a reintegratable channel fault has been
– 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
– The DIAG LED alternates between flashing red and green when a reintegratable
120
module.
configured.
safe SM.
module fault has been cleared, but not yet acknowledged.
cleared, but not yet acknowledged.
present, the DIAG LED is flashing red.
channel fault has been cleared, but not yet acknowledged.
S7-1200 Functional Safety Manual
Manual, 02/2015, A5E03470344-AA