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User Manual
GFK-2849A
5.2
Special LED Blink Patterns
In addition to the LED blink patterns that indicate a fatal error, the ECM850's LEDs can
indicate module location/identification and microprocessor overtemperature conditions,
as described below.
5.2.1
Special LED Patterns - Module Identification
The LEDs on an ECM850 can be commanded to repeatedly turn ON and OFF in a special
sequence, to help locate or identify the module:
•
•
The command blinkId <begin/end> is issued via the Command Line Interface. Issuing the
blinkId begin command starts the identification blink sequencing, while blinkId end stops
the identification blink sequencing. When issued from the Command Line Interface, the last
command session that commands the IDENTIFICATION blink pattern determines its state
(either blinking or stopped). Note that the blinkId command requires Modify-level access to
the Command Line Interface.
5.2.2
Special LED Patterns - Microprocessor Over temperature
If the maximum threshold temperature for the ECM850's microprocessor is crossed, the
ECM850 goes into power-saving mode. While the ECM850 is in an over temperature
condition, LEDs on the module flash at half-second intervals:
OK green
LAN green
STATUS green
CONN amber,
ACTIVE green, USB red
P1 and P2 green
The ECM850 stays in power-saving mode until the temperature drops to a safer level. Once
a safe temperature is reached, the ECM850 restarts. When the ECM850 is restarted, it
retains any entries in its Local Log table and its non-volatile configuration parameters. Any
debug data in non-volatile storage can be viewed from the Command Line Interface using
the log or show log command.
Note:
Diagnostics
First the LEDs are turned on in the following order: OK, LAN, STATUS, CONN, PORT
4, PORT 3, PORT 2, PORT 1. There is a short delay between turning on each LED.
The LEDs are then turned off in the same order. There is a short time delay between
turning off each LED.
Under certain ambient operating temperatures, the ECM850 may momentarily display the
over temperature pattern during power up, while it is calibrating its thermal protection
functions. This indication may be ignored, and no overtemperature entry is added to the
Local Log table, the Controller Fault table or I/O Fault table.
Chapter 5
Oct 2019
106
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