OEM Controls CANBus Product Line User Manual
Page 20
OM-17288
CANBus USERS MANUAL
Page 20 of 38
Revision C
GJO*07-12-06
ORIGINAL
8.0 CANBus LED Operation ( Based on CiA 303 Specification )
Each OEM Controls CAN Module has a BI-Color status LED, usually located between the
Deutsch connectors. This LED provides easy verification that the CANopen bus is
OK, and also allows easy system troubleshooting by illuminating Red, Green, or Amber ( Red and
Green on at the same time ).
In many cases, the BI-color LED will indicate two bits of information. For example, if the GREEN
led is on continuously, but the RED led is doing a “double flash”, this means that the can module
is in the operational state, but that a node guard error has occurred.
INDICATION
GREEN LED
FUNCTIONALITY
(RUN MODE ERRORS)
“NMT”
RED LED
FUNCTIONALITY
(BUS ERRORS)
YELLOW LED
FUNCTIONALITY
(APPLICATION
SOFTWARE)
OFF
N/A
(BRIEFLY AT POWER UP }
NO ERRORS
N/A
BLINK
a continuous on/off
series, .2 sec ON
and .2 sec OFF
PREOPERATIONAL STATE
CONFIGURATION ERROR
TDL MODE
( SEE SECTION 9 )
ON
OPERATIONAL STATE
"BUS OFF" ERROR
CAUSED BY >255
MESSAGE ERRORS
N/A
SINGLE
FLASH
a .2 sec ON
followed by 1 sec
OFF
STOPPED STATE
"REDUCED BUS" ERROR
CAUSED BY >96
MESSAGE ERRORS
N/A
\DOUBLE
FLASH
.2 sec On,
.2 sec Off,
.2 sec On followed
by 1 sec Off
N/A
NODE GUARD EVENT
HAS OCCURRED
N/A
ALTERNATING
GREEN AND RED -
REFERENCE ABOVE
RESULTS FOR EACH
COLOR
RED AND GREEN -
REFERENCE ABOVE
RESULTS FOR EACH
COLOR
YELLOW AND RED -
INCORRECT FIRMWARE IN
"CPU B" ( DUAL CPU
MODULES ONLY )
-When a module is first powered up, it enters the pre-operational state, with a green blink
indication. If there are no CANopen messages within 5 seconds, the module switches to
stopped, with red ON indication.
-One module, usually the OCI-1 “brain”, is also the NMT master (per CiA
Standard 301). As long as this module, and one additional module are detected
on the CANopen bus, the system automatically enters the operational state.
-At any time, if a module is powered on (for example, re-started) it will be
automatically set to operational by the NMT master.