LED Panel

The BMXSRA0405 digital relay output module presents the following LED panel on its front face:

1 Module state LEDs

2 Channel state LEDs

3 Channel detected error LEDs

NOTE:

  • When a channel error is detected, the corresponding LED remains ON until the underlying condition is resolved.

  • Because the relay output module has only four channels, LEDs in positions 4...7 are not used and are never powered on.

Module Diagnostics

Use the four LEDs at the top of the LED panel to diagnose the condition of the BMXSRA0405 digital relay output module:

Module LEDs

Module State

Recommended Response

Run

Err

I/O

LCK

Blinking1

Blinking1

Blinking1

Blinking1

Auto-test at power-on.

–

Blinking1

ON

Blinking1

Blinking1

Auto-test at power-on has detected an internal error on output channels.

–

OFF

ON

OFF

OFF

Internal error detected.

Replace the module if the condition persists.

OFF

Blinking1

OFF

X

Non-configured I/O module.

Configure the module via the CPU.

ON

Blinking1

OFF

X

No communication between CPU and module.The module is in Fallback state.

Verify that:

  • The CPU is an M580 safety CPU and that it is operational.

  • The backplane is operational (if I/O module is on main rack).

  • The cable between the CPU and I/O module is operational and properly connected (if the I/O module is on an extended or remote rack).

ON

Flickering2

OFF

OFF

No communication between CPU and module. The module is in Fallback state (or in Reset if module has never been operating normally).

Debug the condition using the DDDT variables for the I/O module instance.

ON

Flickering2

OFF

ON

Communication not safe and configuration locked. The module is in Fallback state (or in Reset if module has never been operating normally).

  • Verify the locked configuration in the module is equal to the module configuration stored in application in the CPU as configured using Control Expert.

  • Debug the condition using the DDDT variables for the I/O module instance.

ON

ON

OFF

X

Internal error detected on the output channel.

Replace the module if the condition persists.

ON

OFF

OFF

OFF

Communication with CPU is safe and the configuration is unlocked.

–

ON

OFF

OFF

ON

Communication with CPU is safe and the configuration is locked.

–

X indicates the LED state can be either ON or OFF.

1. Blinking: 500 ms ON / 500 ms OFF.

2. Flickering: 50 ms ON / 50 ms OFF.

Channel Diagnostics

Use all the LEDs on the BMXSRA0405 digital relay output module to diagnose channel status:

Module LEDs

Channel LEDs

Channel State

Recommended Response

Run

Err

I/O

LCK

Channel State (LED 0...3)

Detected Error (LED 0...3)

ON

OFF

OFF

X

ON

OFF

Output relay is closed.

–

ON

OFF

OFF

X

OFF

OFF

Output relay is open.

–

ON

ON

OFF

X

OFF

ON

The output relay is not operational.

Replace the module if the condition persists.

X indicates the LED state can be either ON or OFF.