All modules provide a Status LED with different defined functions as described here.
The Automation Server or AS-P Status LED indicates its condition as follows:
LED Patterns |
Condition of the Automation Server or AS-P |
Green, constant |
Normal operation, status OK |
Green, flashing (~1 Hz) |
Device restarting, wait |
Red, constant |
Fatal error– attention required |
Red, flashing (~1 Hz) |
Device operates, but a problem needs attention |
Red/green, flashing (~1 Hz) |
Firmware being downloaded, wait |
Red/green, vague |
Device firmware upgrade mode, wait |
Red/green, vague |
Reset button has been pressed for more than 8 s, meaning a cold start occurs when the button is released |
No light |
No input power |
The PS-24V Status LED indicates the condition of the device as follows:
LED Patterns |
Condition |
Green, constant |
Output voltage and load OK |
Red/green, flashing |
Output slightly overloaded |
Red, constant |
Output overloaded |
No light |
No input power |
All of the I/O modules include a Status LED indicating the condition of the device as described in the following table:
LED Patterns |
Condition of the I/O Module |
Green, constant |
Online and configured (at least one channel/point downloaded successfully) |
Green, flashing (Fast 2.5 Hz) |
Online and unconfigured (physical module that either matches/mismatches logical module) |
Green, slow flashing (3 sec) |
Low power mode (saves energy) |
Red, constant |
Error requiring attention (for example, the input voltage is too low) |
Red, flashing (Fast 5Hz) |
Offline with respect to the Automation Server, or AS-P (both configured and unconfigured modules) |
Red/Green, flashing (5Hz) |
Bootloader mode (downloading data) |
No light |
No input power |