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2-11
2 Nomenclature and Installation
CJ-series User Defined CAN Unit Operation Manual for NJ-series CPU Unit (W517)
2-2 Inst
allin
g the User D
efin
ed CA
N Uni
t
2
2-
2-5 U
nit S
tates
Events
Events will force the Unit to switch to a different state. These events can be user initialized, caused
by system behavior or error conditions detected in the system. Changed state information is
reflected as changes in device variables for CJ-series Units
.
In normal operating mode the Unit is
initialized and no start-up errors occur.
In case the User Defined CAN Unit detects an abnormal rate of errors on the bus, the Unit will go in
bus off
. This means that all CAN communication is disabled and the Unit will try to go online after the
user enables the communication (normally this is initiated in the user program). In the
bus off
state
the Unit will:
•
Turn ON the *
_BusoffErr
•
Activate event EV5, i.e. disable communications
•
Turn ON the ERR LED indicator
State
Name
Cyclic refresh of message
command(s)
Description
ST1
Initializing
No
The Unit executes start-up tests and ini-
tializes the CPU bus communications.
ST2
Start-up error
No
A start-up error was detected during start-
up tests or during the intialization of the
CPU communication bus.
ST3
Not configured
Yes
The Unit started without start-up errors but
is not yet configured using message com-
mands.
ST4
Configured
Yes
The Unit has received the memory loca-
tions and a number of output and input
message buffers.
ST5
Communicating
Yes
CAN messages can be sent and received
if the network is powered.
Event
Name
Description
EV1
Configure memory
areas
The memory areas for message buffers, send triggers and
receive flags have been successfully configured through mes-
sage commands.
EV2
Configure one CAN
message
One of the output message buffers or input message buffers
has been successfully configured through message com-
mands.
EV3
Enable communica-
tions
CAN messaging has been successfully enabled with device
variables for CJ-series Units
EV4
Disable communica-
tions
CAN messaging has been disabled with device variables for
CJ-series Units
EV5
Bus-off
CAN messaging has been transitioned to the bus off state, e.g.
a bus-error occurred.
Bus Off State
Summary of Contents for CJ1W-CORT21
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Page 140: ...Appendices A 6 CJ series User Defined CAN Unit Operation Manual for NJ series CPU Unit W517...
Page 141: ...Index 1 CJ series User Defined CAN Unit Operation Manual for NJ series CPU Unit W517 I Index...
Page 144: ...Index 4 CJ series User Defined CAN Unit Operation Manual for NJ series CPU Unit W517 Index...