LED Display

An 8-LED display is located on the front panel of the controller:

LED Descriptions

LED Indicator

Description

RUN

ON: The controller is in RUN state.

ERR

ON: The controller or system has detected an error.

I/O

ON: The controller or system has detected an error in one or more I/O modules.

DL (download)

  • Flashing: Firmware update in progress.

  • OFF: No firmware update in progress.

BKP

ON:

  • The memory card or controller flash memory is missing or inoperable.

  • The memory card is not usable (incorrect format, unrecognized type).

  • The memory card or controller flash memory content is inconsistent with the application.

  • The memory card has been removed and reinserted.

  • A PLC > Project Backup... > Backup Clear command has been performed when no memory card was present. The BACKUP LED remains ON until the project is successfully backed up.

OFF: The memory card or controller flash memory content is valid, and the application in the execution memory is identical.

SEC

Not used.

ETH MS

Module Status (green/red): Indicates the Ethernet port configuration status.

ETH NS

Network Status (green/red): Indicates the Ethernet connection status.

This table describes the LED indicator patterns used in the LED diagnostic indications table thereafter:

Symbol

Description

Symbol

Description

off

steady red

steady green

flashing red

flashing green

flashing red/green

LED Diagnostic Indications

In a Hot Standby system, specific IP addresses (Main IP Address, Main IP Address + 1, IP Address A, IP Address B) are assigned and these addresses must not be used by other devices in the system.

Duplicate IP addresses can cause errors in communication with the other modules.

The LEDs provide detailed diagnostic information when you observe their pattern in combination:

Condition

Controller State

RUN

ERR

I/O

ETH MS

ETH NS

power on

Autotest

not configured

(before getting a valid IP address or configuration is invalid)

NOCONF

–

configured

Stop

• off: no error detected

• steady red: error detected in a module or a channel

• off: invalid IP address

• flashing green: valid IP address but no EtherNet/IP connection

• steady green: EtherNet/IP connection established

RUN

recoverable error detected

HALT

–

• flashing red: At least one exclusive owner CIP connection (for which the BMENOC0301/BMENOC0311 is the originator) is timed out. The LED flashes until the connection is reestablished or the module is reset.

duplicate IP address

–

–

–

–

unrecoverable error detected

–

power off

–

–: any pattern