9
USING STATUS LEDS
(continued)
RS485 LEDs
RS485 port A (Com1) and RS495 port B (COM2) each have two LEDs reflecting port activity as follows:
• Yellow
(TX): Indicates the controller is transmitting data on the RS485 port
• Green
(RX): Indicates the controller is receiving data from an RS485 device connected to this port
These LEDs use a fixed “on time” when a message is detected on the port. If a receive LED is on constantly, this can indicate a wiring
problem, such as a shorted wire or reversed wiring.
STAT (Status) LED
The green “STAT” LED provides a CPU machine status check, and should remain lit whenever the controller is powered. If the status
LED does not light while power is applied contact tech support.
BEAT (Heartbeat) LED
In normal operation, the
yellow
heartbeat (BEAT) LED blinks at 1 Hz, at 50% on/off duty cycle. During controller bootup, this LED may
blink at 1 Hz with a 90%/10% on/off cycle, or in some other irregular pattern. When bootup completes, the platform daemon is started,
and the normal 1 Hz flash at 50%/50% on/off duty cycle returns.
If the “BEAT” LED stays on constantly, does not light, or blinks very fast, contact technical support.
PRI, SEC (Ethernet) LEDs
Two LEDs for each of the two LAN ports indicate as follows:
• Green
(left side) “Link” LED operates as follows:
- Off: No Ethernet link is made
- On: Ethernet link is made
• Yellow
(right side) “Activity” LED operates as follows:
- Off: No Ethernet activity
- On: Blinking indicates activity (typical if Link is On)
BACKUP LED
A green “BACKUP” LED is behind the front access door, and is visible only if the door is open (see diagram, next page). Typically, this
LED remains off.
Possible “BACKUP” LED states are:
On Solid:
USB backup media detected. Occurs when you insert a USB flash drive to signal a backup is possible
Alert Mode:
100ms On/100ms Off repeating (fast blink). Occurs for several seconds in the following scenarios:
•
When USB media was detected, after the controller’s BACKUP button is pressed (backup mode)
•
When the controller is power cycled while holding in the BACKUP button (recovery/restore mode)
Working Mode:
1s On/1s Off repeating (slow blink. Never remove power in this mode (See following warning)
Error Mode:
Two quick 200ms flashes On, 3 seconds Off, repeating
Some scenarios where the BACKUP LED is used include:
USB Drive Inserted
- A USB flash drive is inserted in the USB 2.0 port, to either backup a commissioned unit to the USB drive, or to
restore an existing backup from the drive. The BACKUP LED lights when the USB drive is mounted.
Backup
- A backup is initiated by pressing the BACKUP button from 1 to 5 seconds before releasing, where the LED starts blinking in
“alert mode” for 5 seconds. Another button press in this period starts the backup, where the LED blinks in the “working mode” pattern.
When the backup completes, the LED turns Off, and the USB drive can be removed.
Boot to Recover Or Restore Image
- The unit is powered up while holding in the BACKUP button, for either:
•
(No USB media detected) A “factory defaults” recovery from an onboard partition with default image
•
(If USB media is detected) For the restore of a backup image on the USB flash drive. Note: This also requires a serial shell
connection to the controller’s Debug port.
In either case, the BACKUP LED starts blinking in “alert mode” pattern. If you release the BACKUP button during this period (within 5
seconds), initiation begins for either:
•
If no USB media is detected, the “factory defaults’ recovery image installation
•
If USB media is detected, the system enters “restore mode.” In this mode, after login with serial shell, a menu lists the available
backup images on the USB flash drive. You can select one (and enter the unique security key to initiate its installation, or
alternatively select to install the “factory defaults” recovery image.
During a recovery or restore image installation, the LED blinks in the “working mode” pattern. When the image installation completes, the
BACKUP LED turns Off. A controller reboot is then required.
The 1 Hz, 90%/10% on/off “BEAT” flash at bootup also occurs during other critical operations, such as
a firmware upgrade to the controller and/or any attached modules. To be safe, do not remove power
from the controller while its “BEAT” LED flashes with a 90%/10% on/off duty cycle. Wait for the normal
(50%/50%) flash to return before removing power.
CAUTION
Do not remove power while a recovery image install or backup
restore is in progress, meaning the BACKUP LED is flashing in
“working mode” pattern (1s On/1s Off, or slow blink). Otherwise,
the controller will be inoperable (“bricked”), and must be returned
to a service center for repair.
WARNING
