Status Indicators

The status indicators are below the status display on the controller. They indicate the state of the controller as described in these tables.
IMPORTANT:
Status indicators do not provide detailed diagnostics for safety functions. Use them only for general diagnostics during commissioning or troubleshooting. Do not attempt to use status indicators to determine operational status.
The controller has eight status indicators and one four-character scrolling status display.
The 1756-L9SP safety partner has the four-character scrolling status display and the MOD status indicator.
Status Indicators
This image shows the status indicators for a ControlLogix 5590 controller  and safety partner.
Status Indicators
Letter
Item
Description
A
4-character display
Scrolls information about the module.
B
Module Status Indicators
Indicates the current state of the module (MOD, RUN, FORCE, SD).
C
Ethernet Status Indicators
Indicates the current state of transmission of data on the
EtherNet/IP™
 network (LINK, NET).

MOD Indicator

The MOD status indicator shows the state of the controller.
Controller MOD Status Indicator
State
Description
Off
No power is applied to the device.
Steady red
The device has a Major Unrecoverable Fault
Flashing red
The device has a Major Recoverable Fault.
Steady green
The device is operating normally.
Flashing green
The device is in one of the following states:
  • The device is not configured.
  • The module requires a firmware update.
  • Firmware update in progress.
  • The module is saving a project to internal or external non-volatile memory.
  • The charge of the capacitor in the ESM is being discharged upon powerdown..
  • The module is experiencing a Hardware Preservation Fault due to a high internal module temperature. In this condition, only the status indicator receives power. Once the module cools down to an acceptable temperature, then full power is applied.
Flashing green/red
The device is performing its power up testing.

Safety Partner MOD Indicator

The safety partner has an MOD status indicator.
Safety Partner MOD Status Indicator
State
Description
Off
No power is applied.
Steady green
The safety partner is operating with no faults.
Flashing green
One of the following is true:
  • The safety partner is completing power-up diagnostics.
  • The charge of the capacitor in the ESM is being discharged upon powerdown.
  • The safety partner is powered but is inoperable.
  • The safety partner is loading a project to nonvolatile memory.
  • The safety partner is experiencing a Hardware Preservation Fault due to a high internal module temperature. In this condition, only the status indicator receives power. Once the safety partner cools down to an acceptable temperature, then full power is applied.
Flashing red
The controller is configured for SIL 2 operation, but a safety partner is installed.

RUN Indicator

The RUN status indicator shows the current mode of the controller.
To change the controller mode, you can use the controller switch on the front of the controller or the Controller Status menu in the
Studio 5000 Logix Designer®
 application.
RUN Status Indicator
State
Description
Off
The controller is in Program or Test mode.
Steady green
The controller is in Run mode.

FORCE Indicator

The Force status indicator shows if I/O forces are enabled on the controller.
FORCE Status Indicator
State
Description
Off
No tags contain I/O force values, and I/O force values are not enabled.
Steady yellow
I/O forces enabled. If any I/O force values exist, they are active.
IMPORTANT: Use caution if you change any force values. In this state, the changes take effect immediately.
Flashing yellow
I/O forces exist in the application, but are not active because I/O forces are not enabled.
IMPORTANT: Use caution if you enable I/O forces. All existing I/O force values take effect immediately

SD Indicator

The SD status indicator shows if the SD card is in use.
SD Status Indicator
State
Description
Off
No activity is occurring with the SD card.
Flashing green
The controller is reading from or writing to the SD card.
Important:
 Do not remove the SD card while the controller is reading or writing. Allow the read/write to complete without interruption. If you interrupt the read/write, data corruption or loss can occur.
Steady green
Flashing red
The SD card does not have a valid file system.
Steady red
The controller does not recognize the SD card.
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